IEC 61754-4:2013

Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 4: Type SC connector family

IEC 61754-4:2013 defines the standard interface dimensions for type SC family of connectors. This second edition cancels and replaces the first edition published in 1997 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- addition of the duplex plug and adaptor connector interface;
- reconsideration of the overall content of the standard. The contents of the corrigendum of January 2014 have been included in this copy. Keywords: standard interface dimensions for type SC family of connectors

Dispositifs d'interconnexion et composants passifs à fibres optiques - Interfaces de connecteurs pour fibres optiques - Partie 4: Famille de connecteurs du type SC

IEC 61754-4:2013 définit les dimensions des interfaces normalisées pour la famille des connecteurs de type SC. La présente deuxième édition annule et remplace la première édition publiée en 1997 et constitue une révision technique. La présente édition contient les modifications techniques majeures suivantes par rapport à l'édition précédente:
- ajout de l'interface des fiches et des raccords duplex;
- réexamen de l'ensemble du contenu de la norme. Le contenu du corrigendum de janvier 2014 a été inclut dans la présente version. Mots clés: dimensions des interfaces normalisées pour la famille des connecteurs de type SC

General Information

• Status: Published
• Publication Date: 16-Jul-2013
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Current Stage: DELPUB - Deleted Publication
• Start Date: 28-Feb-2022
• Completion Date: 14-Feb-2026

Relations

• Corrected By: IEC 61754-4:2013/COR1:2014 - Corrigendum 1 - Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 4: Type SC connector family
• Effective Date: 05-Sep-2023
• Revises: IEC 61754-4:1997/AMD1:1999 - Amendment 1 - Fibre optic connector interfaces - Part 4: Type SC connector family
• Effective Date: 05-Sep-2023
• Revised: IEC 61754-4:2022 - Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 4: Type SC connector family
• Effective Date: 05-Sep-2023
• Revises: IEC 61754-4:1997 - Fibre optic connector interfaces - Part 4: Type SC connector family
• Effective Date: 05-Sep-2023
• Revises: IEC 61754-4:1997/AMD2:2001 - Amendment 2 - Fibre optic connector interfaces - Part 4: Type SC connector family
• Effective Date: 05-Sep-2023

Overview

IEC 61754-4:2013 specifies the standard interface dimensions for the Type SC connector family used in fibre‑optic interconnecting devices and passive components. This second edition (2013, with the January 2014 corrigendum included) replaces the 1997 edition and introduces duplex plug and adaptor interfaces plus a re‑evaluation of the standard’s overall content. The standard defines mechanical datums, optical datums and dimensional limits for SC plugs, adaptors and active‑device receptacles (simplex and duplex; PC and APC forms).

Key topics and technical requirements

• Nominal ferrule diameter: the Type SC parent connector uses a 2.50 mm nominal ferrule.
• Coupling mechanism: push–pull (spring‑loaded) coupling with a single male key for orientation and retention.
• Alignment: resilient sleeve alignment mechanism; mechanical datums and optical datums are defined to locate the ferrule endface precisely.
• PC vs APC: separate interfaces for PC (physical contact, spherically polished) and APC (angled PC, typically 8°) endfaces; APC and PC interfaces are not mutually mateable.
• Simplex and duplex interfaces: the edition adds duplex plug and adaptor interface definitions (mechanical and dimensional drawings and tables).
• Active device receptacles: standard interface dimensions for receptacles that accept SC plugs and position the optical datum for active components (transceivers, instrument ports).
• Intermateability: the document defines which plug types mate with which adaptor/receptacle types (PC ↔ PC, APC ↔ APC; mixed mating is restricted).
• Normative references: includes related optical interface standards such as IEC 61755‑3‑1 and IEC 61755‑3‑2 for ferrule endface forms.

(Where specified in the standard, certain dimensional and force values are provided - e.g., ferrule compression force ranges and detailed dimensional tables and grades for critical features.)

Practical applications and users

Who uses IEC 61754‑4:

• Fibre‑optic connector and adapter manufacturers (mechanical design and tooling)
• Transceiver, active device and instrument designers (receptacle interfaces)
• Patch panel, chassis and telecommunication equipment OEMs
• Test labs, conformity assessors and procurement/spec writers
• Data center, FTTH, telecom and datacom system integrators specifying mechanical compatibility

Why it matters:

• Ensures mechanical interchangeability of SC plugs, adaptors and device ports
• Reduces risk of mis‑mating PC vs APC connectors
• Supports reliable optical alignment and repeatable field connections in telecom and datacom deployments

Related standards

• IEC 61755‑3‑1 - Fibre optic connector optical interfaces (2.5 mm & 1.25 mm PC ferrules)
• IEC 61755‑3‑2 - Fibre optic connector optical interfaces (8° APC ferrules)
• Other parts of the IEC 61754 series (connector families and interfaces)

Keywords: IEC 61754‑4:2013, Type SC connector family, standard interface dimensions for type SC family of connectors, SC connector interfaces, fibre optic connector standards.

Standards Content (Sample)

IEC 61754-4 ®
Edition 2.0 2013-07
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces –
Part 4: Type SC connector family

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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IEC 61754-4 ®
Edition 2.0 2013-07
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components – Fibre optic

connector interfaces –
Part 4: Type SC connector family

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
W
ICS 33.180.20 ISBN 978-2-8322-0924-0

– 2 – 61754-4 © IEC:2013(E)
CONTENTS
FOREWORD . 4

1 Scope . 6

2 Normative references . 6

3 Description . 6

4 Interfaces . 6

Bibliography . 38

Figure 1 – Simplex PC plug connector interface . 8
Figure 2 – Simplex adaptor connector interface . 11
Figure 3 – Pin gauge for adaptor . 13
Figure 4 – Duplex PC plug connector interface . 14
Figure 5 – Duplex adaptor connector interface . 17
Figure 6 (continued overleaf) . 20
Figure 6 – Simplex APC plug connector interface . 21
Figure 7 (continued overleaf) . 23
Figure 7 – Duplex APC plug connector interface . 24
Figure 8 – Simplex active device receptacle interface for APC connector plug. 26
Figure 9 – Simplex active device receptacle interface for PC connector plug . 29
Figure 10 – Duplex active device receptacle interface for APC connector plug . 32
Figure 11 – Duplex active device receptacle interface for PC connector plug . 35

Table 1 – Intermateability of interface . 7
Table 2 – Dimensions of the simplex PC plug connector interface . 9
Table 3 – Grade . 10
Table 4 – Dimensions of the simplex adaptor connector interface . 12
Table 5 – Grade . 13
Table 6 – Pin gauge dimensions . 13
Table 7 – Dimensions of the duplex PC plug connector interface . 15
Table 8 – Grade . 16
Table 9 – Dimensions of the duplex adaptor connector interface . 18
Table 10 – Grade . 19
Table 11 – Dimensions of the simplex APC plug connector interfaces . 22
Table 12 – Dimensions of the duplex APC plug connector interfaces . 25
Table 13 – Dimensions of the simplex active device receptacle interface for APC
connector plug . 27
Table 14 – Alignment feature grade . 28
Table 15 – Mechanical stop feature grade . 28
Table 16 – Dimensions of the simplex active device receptacle interface for PC
connector plug . 30
Table 17 – Alignment feature grade . 31
Table 18 – Mechanical stop feature grade . 31

61754-4 © IEC:2013(E) – 3 –
Table 19 – Dimensions of the duplex active device receptacle interface for APC

connector plug . 33

Table 20 – Alignment feature grade . 34

Table 21 – Mechanical stop feature grade . 34

Table 22 – Dimensions of the duplex active device receptacle interface for PC

connector plug . 36

Table 23 – Alignment feature grade . 37

Table 24 – Mechanical stop feature grade . 37

– 4 – 61754-4 © IEC:2013(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –

FIBRE OPTIC CONNECTOR INTERFACES –

Part 4: Type SC connector family

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61754-4 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 1997 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of the duplex plug and adaptor connector interface;
b) reconsideration of the overall content of the standard.

61754-4 © IEC:2013(E) – 5 –
The text of this standard is based on the following documents:

FDIS Report on voting
86B/3620/FDIS 86B/3652/RVD
Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of the IEC 61754 series, under the general title Fibre optic interconnecting
devices and passive components – Fibre optic connector interfaces, can be found on the IEC
website.
Future standards in this series will carry the new general title as cited above. Titles of
existing standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
The contents of the corrigendum of January 2014 have been included in this copy.

– 6 – 61754-4 © IEC:2013(E)
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –

FIBRE OPTIC CONNECTOR INTERFACES –

Part 4: Type SC connector family

1 Scope
This part of IEC 61754 defines the standard interface dimensions for type SC family of
connectors.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
IEC 61755-3-1, Fibre optic connector optical interfaces – Part 3-1:Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia PC ferrule, single mode fibre
IEC 61755-3-2, Fibre optic connector optical interfaces – Part 3-2: Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia ferrules for 8 degrees angled-PC single mode
fibres
3 Description
The parent connector for the type SC connector family is a single position plug connector which
is characterized by a 2,5 mm nominal ferrule diameter. It includes a push-pull coupling
mechanism which is spring loaded relative to the ferrule in the direction of the optical axis. The
plug has a single male key which may be used to orient and limit the relative position between
the connector and the component to which it is mated. The optical alignment mechanism of the
connector is of a resilient sleeve style.
This part of IEC 61754 defines the standard interface dimensions of active device receptacles
for the type SC connectors. The receptacles are used to retain the connector plug and

mechanically maintain the optical datum target of the plugs at a defined position within the
receptacle housings.
4 Interfaces
This standard contains the following standard interfaces:
Interface IEC 61754-4-1: simplex plug connector interface – push/pull, PC
Interface IEC 61754-4-2: simplex adaptor connector interface – push/pull
Interface IEC 61754-4-3: duplex plug connector interface – push/pull, PC
Interface IEC 61754-4-4: duplex adaptor connector interface – push/pull
Interface IEC 61754-4-5: simplex plug connector interface – push/pull, APC 8°
Interface IEC 61754-4-6: duplex plug connector interface – push/pull, APC 8°

61754-4 © IEC:2013(E) – 7 –
Interface IEC 61754-4-X1: simplex active device receptacle interface – for APC 8°connector

plug
Interface IEC 61754-4-X2: simplex active device receptacle interface – for PC connector plug

Interface IEC61754-4-X3: duplex active device receptacle interface – for APC 8°connector plug

Interface IEC 61754-4-X4: duplex active device receptacle interface – for PC connector plug

The plug of interface IEC 61754-4-1 and interface IEC 61754-4-3 has a ferrule with a
spherically polished endface (PC). The plug of interface IEC 61754-4-5 and interface
IEC 61754-4-6 has a ferrule with a spherically polished angled endface which may take any of

the angled PC (APC) forms and realizes a physical contact.

Table 1 shows the intermateability of interface.
Table 1 – Intermateability of interface
Adaptors/active device receptacles interfaces
Plugs
61754-4-2 61754-4-4 61754-4-X1 61754-4-X2 61754-4-X3 61754-4-X4
61754-4-1 Mate Mate Not mate Mate Not mate Mate
61754-4-3 Not mate Mate Not mate Not mate Not mate Mate
61754-4-5 Mate Mate Mate Not mate Mate Not mate
61754-4-8 Not mate Mate Not mate Not mate Mate Not mate

Figure 1 is an example of a simplex plug connector interface. Table 2 gives dimensions of the
simplex plug connector interface and Table 3 gives the grade of the simplex PC plug connector
interface.
A chamfer or radius is allowed to a maximum depth of 1,2 mm from the ferrule endface.

– 8 – 61754-4 © IEC:2013(E)
Mechanical
datum target
Optical
datum target
Ferrule
View from C direction
Coupling sleeve
Guide key
Guide key
View from B direction
Ferrule endface geometry
IEC  1646/13
Figure 1 – Simplex PC plug connector interface

61754-4 © IEC:2013(E) – 9 –
Table 2 – Dimensions of the simplex PC plug connector interface

Reference Dimensions Remarks
Minimum Maximum
2,500 mm See Table 3
A
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F 19º 23°
25º 35°
G
a
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
b
L 2,11 mm –
b c
M 2,0 mm 2,8 mm and
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
P 8,89 mm 8,99 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,90 mm Radius
4,05 mm 4,15 mm
T
U 5,4 mm 5,6 mm
b
V 0 mm 0,5 mm
BC 0° 0,5° 45° chamfer
d
BF 5 mm 30 mm Radius,
e
BG 0,8 mm – Diameter
25° 35° Angle
BI
a
Dimension H is given for plug endface when not mated. It is movable by a certain axial compression force,
with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall be 7,8
N to 11,8 N when the dimension H is 7 mm ± 0,1 mm.

b
Coupling sleeve shall be movable toward right and left direction. These dimensions are given when the
coupling sleeve is moved in its most right-direction position.
c
Dimension M shall be below 0 mm, when a coupling sleeve is moved to its most left-direction position.
d
Dome eccentricity of the spherical polished endface shall be less than 70 μm.
e
See IEC 61755-3-1.
– 10 – 61754-4 © IEC:2013(E)
Table 3 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A – –
a
B – –
a
C – –
a
D – –
b
Am 2,497 2,500
b
Bm 2,497 2,500
b
Cm 2,494 2,500
a
See IEC 61755-3-1.
b
See IEC 61755-6-1.
Figure 2 is an example of a simplex adaptor connector interface. Table 4 gives dimensions of
the simplex adaptor connector interface and Table 5 gives the grade of the simplex adaptor
connector interface.
61754-4 © IEC:2013(E) – 11 –
Mechanical
datum target
Guide groove
Guide groove
IEC  1647/13
Cross-section A-A’
Projection from B direction
IEC  1647/13
Figure 2 – Simplex adaptor connector interface

– 12 – 61754-4 © IEC:2013(E)
Table 4 – Dimensions of the simplex adaptor connector interface

Dimensions
Reference Remarks
Minimum Maximum
See Table 5
A
B 4,69 mm 4,79 mm
D 4,9 mm 5,5 mm
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
0,06 mm 1,00 mm
K
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA 27° 33° Angle
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
0,4 mm 0,6 mm
AE
AI 2,7 mm 2,8 mm
a
BA 5,4 mm 5,6 mm
a
BB 10,8 mm 11,2 mm
a
It may be of a structure as shown by an alternate long and short dash line shown in Figure 2.

61754-4 © IEC:2013(E) – 13 –
Table 5 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
See Note – – Resilient sleeve, and Note

NOTE Add the grade number to the interface reference number.

a
The connector alignment feature is a resilient sleeve. The feature shall accept a gauge
pin shown in Figure 3 to the centre of the adaptor with a force of 2 N to 5,9 N under

the condition that another gauge pin is inserted into the feature from the other side.
The centre of the adaptor is defined by the right side position of the dimension H.

Figure 3 is an example of a pin gauge for adaptor. Table 6 gives pin gauge dimensions.
C or R
IEC  1648/13
Figure 3 –
...

IEC 61754-4 ®
Edition 2.0 2013-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces –
Part 4: Type SC connector family

Dispositifs d’interconnexion et composants passifs à fibres optiques –
Interfaces de connecteurs pour fibres optiques –
Partie 4: Famille de connecteurs du type SC

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IEC 61754-4 ®
Edition 2.0 2013-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic

connector interfaces –
Part 4: Type SC connector family

Dispositifs d’interconnexion et composants passifs à fibres optiques –

Interfaces de connecteurs pour fibres optiques –

Partie 4: Famille de connecteurs du type SC

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-3140-1

– 2 – IEC 61754-4:2013 © IEC 2013
CONTENTS
FOREWORD .4
1 Scope .6
2 Normative references .6
3 Description .6
4 Interfaces .6
Bibliography . 38

Figure 1 – Simplex PC plug connector interface .8
Figure 2 – Simplex adaptor connector interface . 11
Figure 3 – Pin gauge for adaptor . 13
Figure 4 – Duplex PC plug connector interface . 14
Figure 5 – Duplex adaptor connector interface . 17
Figure 6 (continued overleaf) . 20
Figure 6 – Simplex APC plug connector interface . 21
Figure 7 (continued overleaf) . 23
Figure 7 – Duplex APC plug connector interface . 24
Figure 8 – Simplex active device receptacle interface for APC connector plug . 26
Figure 9 – Simplex active device receptacle interface for PC connector plug . 29
Figure 10 – Duplex active device receptacle interface for APC connector plug . 32
Figure 11 – Duplex active device receptacle interface for PC connector plug . 35

Table 1 – Intermateability of interface .7
Table 2 – Dimensions of the simplex PC plug connector interface .9
Table 3 – Grade . 10
Table 4 – Dimensions of the simplex adaptor connector interface . 12
Table 5 – Grade . 13
Table 6 – Pin gauge dimensions . 13
Table 7 – Dimensions of the duplex PC plug connector interface . 15
Table 8 – Grade . 16
Table 9 – Dimensions of the duplex adaptor connector interface . 18
Table 10 – Grade . 19
Table 11 – Dimensions of the simplex APC plug connector interfaces . 22
Table 12 – Dimensions of the duplex APC plug connector interfaces . 25
Table 13 – Dimensions of the simplex active device receptacle interface
for APC connector plug . 27
Table 14 – Alignment feature grade . 28
Table 15 – Mechanical stop feature grade . 28
Table 16 – Dimensions of the simplex active device receptacle interface
for PC connector plug . 30
Table 17 – Alignment feature grade . 31
Table 18 – Mechanical stop feature grade . 31

Table 19 – Dimensions of the duplex active device receptacle interface for APC
connector plug . 33
Table 20 – Alignment feature grade . 34
Table 21 – Mechanical stop feature grade . 34
Table 22 – Dimensions of the duplex active device receptacle interface for PC
connector plug . 36
Table 23 – Alignment feature grade . 37
Table 24 – Mechanical stop feature grade . 37

– 4 – IEC 61754-4:2013 © IEC 2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC CONNECTOR INTERFACES –

Part 4: Type SC connector family

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61754-4 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 1997 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of the duplex plug and adaptor connector interface;
b) reconsideration of the overall content of the standard.

This bilingual version (2016-01) corresponds to the monolingual English version, published in
2013-07.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3620/FDIS 86B/3652/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61754 series, under the general title Fibre optic interconnecting
devices and passive components – Fibre optic connector interfaces, can be found on the IEC
website.
Future standards in this series will carry the new general title as cited above. Titles of
existing standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The contents of the corrigendum of January 2014 have been included in this copy.

– 6 – IEC 61754-4:2013 © IEC 2013
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC CONNECTOR INTERFACES –

Part 4: Type SC connector family

1 Scope
This part of IEC 61754 defines the standard interface dimensions for type SC family of
connectors.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document
and are indispensable for its application. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61755-3-1, Fibre optic connector optical interfaces – Part 3-1:Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia PC ferrule, single mode fibre
IEC 61755-3-2, Fibre optic connector optical interfaces – Part 3-2: Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia ferrules for 8 degrees angled-PC single mode
fibres
3 Description
The parent connector for the type SC connector family is a single position plug connector
which is characterized by a 2,5 mm nominal ferrule diameter. It includes a push-pull coupling
mechanism which is spring loaded relative to the ferrule in the direction of the optical axis.
The plug has a single male key which may be used to orient and limit the relative position
between the connector and the component to which it is mated. The optical alignment
mechanism of the connector is of a resilient sleeve style.
This part of IEC 61754 defines the standard interface dimensions of active device receptacles
for the type SC connectors. The receptacles are used to retain the connector plug and
mechanically maintain the optical datum target of the plugs at a defined position within the
receptacle housings.
4 Interfaces
This standard contains the following standard interfaces:
Interface IEC 61754-4-1: simplex plug connector interface – push/pull, PC
Interface IEC 61754-4-2: simplex adaptor connector interface – push/pull
Interface IEC 61754-4-3: duplex plug connector interface – push/pull, PC
Interface IEC 61754-4-4: duplex adaptor connector interface – push/pull
Interface IEC 61754-4-5: simplex plug connector interface – push/pull, APC 8°
Interface IEC 61754-4-6: duplex plug connector interface – push/pull, APC 8°

Interface IEC 61754-4-X1: simplex active device receptacle interface – for APC 8°connector
plug
Interface IEC 61754-4-X2: simplex active device receptacle interface – for PC connector plug
Interface IEC61754-4-X3: duplex active device receptacle interface – for APC 8°connector
plug
Interface IEC 61754-4-X4: duplex active device receptacle interface – for PC connector plug
The plug of interface IEC 61754-4-1 and interface IEC 61754-4-3 has a ferrule with a
spherically polished endface (PC). The plug of interface IEC 61754-4-5 and interface
IEC 61754-4-6 has a ferrule with a spherically polished angled endface which may take any
of the angled PC (APC) forms and realizes a physical contact.
Table 1 shows the intermateability of interface.
Table 1 – Intermateability of interface
Adaptors/active device receptacles interfaces
Plugs
61754-4-2 61754-4-4 61754-4-X1 61754-4-X2 61754-4-X3 61754-4-X4
61754-4-1 Mate Mate Not mate Mate Not mate Mate
61754-4-3 Not mate Mate Not mate Not mate Not mate Mate
61754-4-5 Mate Mate Mate Not mate Mate Not mate
61754-4-8 Not mate Mate Not mate Not mate Mate Not mate

Figure 1 is an example of a simplex plug connector interface. Table 2 gives dimensions of the
simplex plug connector interface and Table 3 gives the grade of the simplex PC plug
connector interface.
A chamfer or radius is allowed to a maximum depth of 1,2 mm from the ferrule endface.

– 8 – IEC 61754-4:2013 © IEC 2013

Mechanical
datum target
Optical
datum target
Ferrule
View from C direction
Coupling sleeve
Guide key
Guide key
View from B direction
Ferrule endface geometry
IEC  1646/13
Figure 1 – Simplex PC plug connector interface

Table 2 – Dimensions of the simplex PC plug connector interface
Reference Dimensions Remarks
Minimum Maximum
A 2,500 mm See Table 3
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F 19º 23°
G 25º 35°
a
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
b
L 2,11 mm –
b c
M 2,0 mm 2,8 mm and
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
P 8,89 mm 8,99 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,90 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
b
V 0 mm 0,5 mm
BC 0° 0,5° 45° chamfer
d
BF 5 mm 30 mm Radius,
e
BG 0,8 mm – Diameter
BI 25° 35° Angle
a
Dimension H is given for plug endface when not mated. It is movable by a certain axial compression force,
with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall
be 7,8 N to 11,8 N when the dimension H is 7 mm ± 0,1 mm.
b
Coupling sleeve shall be movable toward right and left direction. These dimensions are given when the
coupling sleeve is moved in its most right-direction position.
c
Dimension M shall be below 0 mm, when a coupling sleeve is moved to its most left-direction position.
d
Dome eccentricity of the spherical polished endface shall be less than 70 µm.
e
See IEC 61755-3-1.
– 10 – IEC 61754-4:2013 © IEC 2013
Table 3 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A – –
a
B – –
a
C – –
a
D – –
b
Am 2,497 2,500
b
Bm 2,497 2,500
b
Cm 2,494 2,500
a
See IEC 61755-3-1.
b
See IEC 61755-6-1.
Figure 2 is an example of a simplex adaptor connector interface. Table 4 gives dimensions of
the simplex adaptor connector interface and Table 5 gives the grade of the simplex adaptor
connector interface.
Mechanical
datum target
Guide groove
Guide groove
IEC  1647/13
Cross-section A-A’
Projection from B direction
IEC  1647/13
Figure 2 – Simplex adaptor connector interface

– 12 – IEC 61754-4:2013 © IEC 2013
Table 4 – Dimensions of the simplex adaptor connector interface
Dimensions
Reference Remarks
Minimum Maximum
A  See Table 5
B 4,69 mm 4,79 mm
D 4,9 mm 5,5 mm
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA 27° 33° Angle
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
AI 2,7 mm 2,8 mm
a
BA 5,4 mm 5,6 mm
a
BB 10,8 mm 11,2 mm
a
It may be of a structure as shown by an alternate long and short dash line shown in Figure 2.

Table 5 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
See Note – – Resilient sleeve, and Note

NOTE Add the grade number to the interface reference number.
a
The connector alignment feature is a resilient sleeve. The feature shall accept a
gauge pin shown in Figure 3 to the centre of the adaptor with a force of 2 N to 5,9 N
under the condition that another gauge pin is inserted into the feature from the other
side. The centre of the adaptor is defined by the right side position of the dimension
H.
Figure 3 is an example of a pin gauge for adaptor. Table 6 gives pin gauge dimensions.
C or R
IEC  1648/13
Figure 3 – Pin gauge for adaptor
Table 6 – Pin gauge dimensions
Dimensions
mm
Reference Remarks
Minimum Maximum
CK 2,498 5 2,499 5 Surface roughness
Grade N4 (0,2 µm radius)
CL 2,8 4,8
CN 7 15
Figure 4 is an example of a duplex PC plug connector interface. Table 7 gives dimensions of
the duplex PC plug connector interface and Table 8 gives the grade of the duplex PC plug
connector interface.
A chamfer or radius is allowed to a maximum depth of 1,2 mm from the ferrule endface.

– 14 – IEC 61754-4:2013 © IEC 2013
Mechanical
datum target
Optical
datum target
Ferrule
Guide key
Delatch housing
Partial cross-section A-A’
View from B direction
Ferrule endface geometry
IEC  1649/13
Figure 4 – Duplex PC plug connector interface

Table 7 – Dimensions of the duplex PC plug connector interface
Dimensions
Reference Remarks
Minimum Maximum
A 2,500 mm See Table 8
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F 19° 23° Angle
G 25° 35° Angle
a
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
b
L 2,11 mm  –
b c
M 2,0 mm 2,8 mm and
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
d
P 8,79 mm 8,89 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,9 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
b
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Degree chamfer
e
DB 12.65 mm 12.75 mm
DD 7 –
f
BF 5 mm  30 mm Radius,
g
BG Diameter
– –
BI 25° 35°
a
Dimension H is given for plug endface when not mated. It is movable by a certain axial compression force,
with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall
be 7,8 N to 11,8 N when the dimension H is 7 mm ± 0,1 mm.
b
The delatch housing shall be movable towards right and left direction. Dimensions L, M and V are given
when the delatch housing is moved in its extreme right-direction position.
c
Dimension M shall be below 0 mm, when the delatch housing is moved to its most left-direction position.
d
The delatch housing may be a rigid sleeve. When two simplex plugs are retained together by a flexible
sleeve, the dimension P shall be from 8,89 mm to 8,99 mm.
e
The delatch housing may be a rigid sleeve. When two simplex plugs are retained together by a flexible
sleeve, the dimension DB shall be from 12,25 mm to 13,15 mm.
f
The dome eccentricity of the spherical polished endface shall be less than 70 µm.
g
See IEC 61755-3-1.
– 16 – IEC 61754-4:2013 © IEC 2013
Table 8 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A – –
a
B – –
a
C – –
a
D – –
b
Am 2,497 2,500
b
Bm 2,497 2,500
a
See IEC 61755-3-1.
b
See IEC 61755-6-1.
Figure 5 is an example of a duplex adaptor connector interface. Table 8 gives dimensions of
the duplex adaptor connector interface and Table 9 gives the grade of the duplex adaptor
connector interface.
Mechanical
datum target
Guide groove
Partial cross-section A-A’
Guide groove
Cross-section B-B’
IEC  1650/13
Figure 5 – Duplex adaptor connector interface

– 18 – IEC 61754-4:2013 © IEC 2013
Table 9 – Dimensions of the duplex adaptor connector interface
Dimensions
Reference Remarks
Minimum Maximum
A  See Table 10
B 4,39 mm 4,69 mm
D 4,9 mm 5,5 mm
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA 27° 33° Angle
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
AI 2,7 mm 2,8 mm
a
BA 5,4 mm 5,6 mm
a
BB 10,8 mm 11,2 mm
DB 12,65 mm 12,75 mm
DD – 6,99 mm
a
It may be of a structure as shown by a dash line in Figure 5.

Table 10 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
See note  Resilient sleeve, and Note
NOTE Add grade number to the interface reference number.
a
The connector alignment feature is a resilient sleeve. The feature shall accept a
gauge pin shown in Figure 3 to the centre of the adaptor with a force of 2 N to 5,9 N
under the condition that another gauge pin is inserted into the feature from the other
side. The centre of the adaptor is defined by the right side position of the dimension H.

Figure 6 is an example of a simplex APC plug connector interface. Table 11 gives dimensions
of the simplex APC plug connector interface.

– 20 – IEC 61754-4:2013 © IEC 2013

Mechanical
datum target
Optical datum
target
Ferrule
Delatch housing
B
Cross-section A-A’
Plane F
Guide key
Ferrule
Plane E
Guide key
View from B direction
Guide key
Projected from D direction
IEC  1651/13
Figure 6 (continued overleaf)
IEC  1652/13
Figure 6 – Simplex APC plug connector interface

– 22 – IEC 61754-4:2013 © IEC 2013
Table 11 – Dimensions of the simplex APC plug connector interfaces
Dimensions
Reference Remarks
Minimum Maximum
a
A  2,500 mm
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F 19° 23° Angle
G 25° 35° Angle
b
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05
c
L 2,11 mm –
c d
M 2,0 mm 2,8 mm and
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
P 8,89 mm 8,99 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,9 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
c
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Degree chamfer
e
EA
a
Detail dimensions and the grade number of the ferrule is required in IEC 61755-3-2. Add grade number to

the interface reference number.
b
Dimension H is given for plug endface when not mated. It is movable by a certain axial compression force,
with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall
be 7,8 N to 11,8 N when the dimension H is 7 mm ± 0,1 mm.
c
The delatch housing shall be moveable towards right and left directions. Dimensions L, M and V are given
when the delatch housing is moved in its extreme right direction position.
d
Dimension M shall be below 0 mm, when the delatch housing is moved to its extreme left direction position.
e
Dimension EA is defined as an angle between two planes: one plane, plane A, passes through the axis of
the ferrule and axis of symmetry of the key of the angled endface connector plug. The other plane, plane B,
passes through the axis of the ferrule and the normal to the angled PC reference plane. The dimension EA
shall be 90° as a basic dimension.

Figure 7 is an example of a duplex APC plug connector interface. Table 12 gives dimensions
of the duplex APC plug connector interface.

Mechanical
datum target
Optical
datum target
Ferrule
Guide key
Delatch housing
Cross section A-A’
Plane E
Guide key
Ferrule
Plane D
Guide key
View from B direction
IEC  1653/13
Figure 7 (continued overleaf)
– 24 – IEC 61754-4:2013 © IEC 2013

IEC  1654/13
Figure 7 – Duplex APC plug connector interface

Table 12 – Dimensions of the duplex APC plug connector interfaces
Dimensions
mm
Reference Remarks
Minimum Maximum
a
A 2,500 mm
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F 19° 23° Angle
G 25° 35° Angle
b
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
c
L 2,11 –
c d
M 2 mm 2,8 mm and
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
e
P 8,79 mm 8,89 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,9 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
c
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Degree chamfer
f
DB
DD 7,0
g
EA
a
Detail dimensions and the grade number of the ferrule is required in IEC 61755-3-2. Add grade number to the

interface reference number.
b
Dimension H is given for plug endface when not mated. It is movable by a certain axial compression force,
with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall be 7,8
N to 11,8 N when the dimension H is 7 mm ± 0,1 mm.
c
The delatch housing shall be moveable towards right and left directions. Dimensions L, M and V are given
when the delatch housing is moved in its extreme right direction position.
d
Dimension M shall be below 0 mm, when the delatch housing is moved to its extreme left direction position.
e
The delatch housing may be rigid sleeve. When two simplex plugs are retained together by a flexible sleeve,
the dimension P shall be from 8,89 mm to 8,99 mm.
f
When two simplex plugs are retained together by a flexible sleeve, the dimension DB shall be from 12,25 mm
to 13,15 mm.
g
Dimension EA is defined as an angle between two planes: one plane, plane A, passes through the axis of the
ferrule and axis of symmetry of the key of the angled endface connector plug. The other plane, plane B,
passes through the axis of the ferrule and the normal to the angled PC reference plane. The dimension EA
shall be 90° as a basic dimension.
Figure 8 is an example of a simplex active device receptacle interface for angled PC
connector plug. Table 13 gives dimensions of the simplex active device receptacle interface
for angled PC connector plug.
Table 14 and 15 gives alignment feature grade and mechanical stop feature grade for the
simplex active device receptacle interface for angled PC connector plug.

– 26 – IEC 61754-4:2013 © IEC 2013
Mechanical
datum
target
Guide groove
Guide groove
View from B direction
Cross-section A-A’
Ferrule
Optical datum target
IEC  1655/13
Detail of C – Mechanical stop feature

Figure 8 – Simplex active device receptacle interface for APC connector plug

Table 13 – Dimensions of the simplex active device receptacle interface
for APC connector plug
Dimensions
Reference Remarks
Minimum Maximum
A  See Table 14
B 4,39 mm 4,79 mm
D 4,9 mm 5,5 mm
a
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,2 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA 27° 33° Angle
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
b
BA 5,4 mm 5,6 mm
B
BB 11,0 mm 11,2 mm
a
OA  , see Table 15
OC 0 mm 0,05 mm Radius
a
OD  , see Table 15
a
An example of a mechanical stop feature is shown in Figure 8. A mechanical stop feature is required in
IEC 61755-3-2 within the clearances specified in Table 15 depending upon the application.
b
This may be a structure as shown by a dashed line shown in Figure 8.

– 28 – IEC 61754-4:2013 © IEC 2013
Table 14 – Alignment feature grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a b
1 2,500 2,502 and
a b
2 2,501 2,504 and
a b
3 2,501 2,510 and
a b
4 2,501 2,525 and
b c
5  Resilient sleeve, and
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the interface reference number.
c
The connector alignment feature is a resilient sleeve. The feature accepts a gauge pin shown in Figure 3
to the centre of the receptacle with a force of 2,9 N to 5,9 N. The centre of the receptacle is defined by
the right side position of the dimension H. The measurement is performed using a single gauge pin.

Table 15 – Mechanical stop feature grade
Dimensions Dimensions
mm µm
Grade Remarks
OA OA OD
minimum maximum clearance
a b
A 0,150 0,2 and
±15
a b
B 0,150 0,35 ±40 and
a b
N 0,150 –  and
a b
X   and
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the alignment feature grade number.
c
The connector alignment feature is a resilient sleeve.

Figure 9 is an example of a simplex active device receptacle interface for PC connector plug.
Table 16 gives dimensions of the simplex active device receptacle interface for PC connector
plug.
Table 17 and 18 gives alignment feature grade and mechanical stop feature grade for
simplex active device receptacle interface for PC connector plug.

Mechanical
datum target
Guide groove
Guide groove
Projected from B direction
Cross-section A-A’
Ferrule
Optical datum target
Detail of C – Mechanical stop feature
IEC  1656/13
Figure 9 – Simplex active device receptacle interface for PC connector plug

– 30 – IEC 61754-4:2013 © IEC 2013
Table 16 – Dimensions of the simplex active device receptacle interface
for PC connector plug
Dimensions
Reference Remarks
Minimum Maximum
A  See Table 17
B 4,39 mm 4,79 mm
D 4,9 mm 5,5 mm
a
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,2 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA 27° 33° Angle
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
b
BA 5,4 mm 5,6 mm
b
BB 11,0 mm 11,2 mm
a
OA  radius and see Table 18
OC 0 mm 0,15 mm Radius
a
OD  see Table 18
a
An example of a mechanical stop feature is shown in Fgure 9. A mechanical stop feature is required in
Table 3 within the clearances specified in Table 18 depending upon the application.
b
This may be a structure as shown by a dashed line shown in Figure 9.

Table 17 – Alignment feature grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a b
1 2,500 2,502 and
a b
2 2,501 2,504 and
a b
3 2,501 2,510 and
a b
4 2,501 2,525 and
b c
5  Resilient sleeve, and
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the interface reference number.
c
The connector alignment feature is a resilient sleeve. The feature accepts a gauge pin shown in Figure 3
to the centre of the receptacle with a force of 2 N to 5,9 N. The centre of the receptacle is defined by the
right side position of the dimension H.

Table 18 – Mechanical stop feature grade
Dimensions Dimensions
mm
µm
Grade Remarks
OA OA OD
minimum maximum clearance
a b
A 0,150 0,2 and
±5
a b
B 0,150 0,35 and
±10
a b
N 0,150 1,250  and
b c
X   and
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the alignment feature grade number.
c
The connector alignment feature is a resilient sleeve.

Figure 10 is an example of a duplex active device receptacle interface for angled PC
connector plug. Table 19 gives dimensions of the duplex active device receptacle interface
for angled PC connector plug.
Table 20 and 21 gives alignment feature grade and mechanical stop feature grade for the
duplex active device receptacle interface for angled PC connector plug.

– 32 – IEC 61754-4:2013 © IEC 2013
Mechanical
datum target
Guide groove
Guide groove
Ferrule
Cross-section B-B’
Optical datum target
Detail of C – Mechanical stop feature
IEC  1657/13
Figure 10 – Duplex active device receptacle interface for APC connector plug

Table 19 – Dimensions of the duplex active device receptacle interface
for APC connector plug
Dimensions
Reference Remarks
Minimum Maximum
A  See Table 20
B 4,39 mm 4,69 mm
D 4,9 mm 5,5 mm
a
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA 27° 33° Angle
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
b
BA 5,4 mm 5,6 mm
b
BB 11,0 mm 11,2 mm
DB 12,65 mm 12,75 mm
DD – 6,99 mm
a
OA  , see Table 21
OC 0 mm 0,15 mm Radius
a
OD  , see Table 21
a
It may be a structure as shown by a dashed line shown in Figure 10.
b
An example of a mechanical stop feature is shown in Figure 10. A mechanical stop feature is required in
IEC 61755-3-2 within the clearances specified in Table 21 depending upon the application.

– 34 – IEC 61754-4:2013 © IEC 2013
Table 20 – Alignment feature grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a b
1 2,500 2,502 and
a b
2 2,501 2,504 and
a b
3 2,501 2,510 and
a b
4 2,501 2,525 and
b c
5  Resilient sleeve, and
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the interface reference number.
c
The connector alignment feature is a resilient sleeve. The feature accepts a gauge pin shown in Figure 3
to the centre of the receptacle with a force of 2,9 N to 5,9 N. The centre of the receptacle is defined by
the right side position of the dimension H. The measurement is performed using a single gauge pin.

Table 21 – Mechanical stop feature grade
Dimensions
Dimensions
mm
µm
Grade Remarks
OA OA OD
minimum maximum clearance
a b
A 0,150 0,2 and
±15
a b
B 0,150 0,35 and
±40
a b
N 0,150 –  and
b c
X   and
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the alignment feature grade number.
c
The connector alignment feature is a resilient sleeve.

Figure 11 is an example of a duplex active device receptacle interface for PC connector plug.
Table 22 gives dimensions of the duplex active device receptacle interface for PC connector
plug.
Table 23 and 24 gives alignment feature grade and mechanical stop feature grade for the
duplex active device receptacle interface for PC connector plug.

Mechanical
datum targe
...