IEC 61754-18:2001

Fibre optic connector interfaces - Part 18: Type MT-RJ connector family

IEC 61754-18:2001 defines the standard interface dimensions for the type MT-RJ family of connectors. Keywords: type MT-RJ family of connectors

Interfaces de connecteurs pour fibres optiques - Partie 18: Famille de connecteurs de type MT-RJ

L'IEC 61754-18:2001 définit les dimensions des interfaces normalisées pour la famille de connecteurs de type MT-RJ. Mots clés: famille de connecteurs de type MT-RJ.

General Information

• Status: Published
• Publication Date: 05-Dec-2001
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Current Stage: PPUB - Publication issued
• Start Date: 06-Dec-2001
• Completion Date: 15-Jan-2002

Relations

• Replaces: IEC PAS 61754-18:2001 - Fibre optic connector interfaces - Part 18: Type MT-RJ connector family
• Effective Date: 31-May-2024

Overview

IEC 61754-18:2001 specifies the standard interface dimensions for the type MT-RJ family of connectors. This IEC international standard defines plug, adaptor and receptacle interfaces for MT-RJ connectors, including versions with and without guide pins and with or without alignment ribs. The document sets geometric datums, ferrule sizes, pin/hole alignment features and tolerance grades to ensure mechanical interchangeability and reliable optical alignment.

Key Topics

• Connector family definition: The parent MT-RJ plug uses a rectangular ferrule (nominally 4.4 mm × 2.5 mm) aligned by two 0.7 mm diameter pins; it includes a single coupling latch, a spring-loaded ferrule and a male orientation key.
• Interface variants: Standardized interfaces include:
  • Plug without pins (single, 2-fibre 0.25 mm pitch, 2-fibre 0.75 mm pitch, 4-fibre 0.25 mm pitch)
  • Plug with guide pins (same fibre configurations)
  • Adaptor interface (for plug-adaptor-plug mating)
  • Receptacle interfaces with pins, with and without ribs (for plug-receptacle mating)
• Dimensional specifications and tolerances: Detailed dimensional tables and tolerance grades are provided for each interface. Critical dimensions (e.g., ferrule geometry, pin-hole sizes, plug gauge and gauge-pin geometry) are defined to achieve repeatable mating.
• Gauge and test criteria: The standard defines gauge-pin and plug-gauge geometries and acceptance criteria, including insertion depths and maximum insertion forces (e.g., gauge-pin insertion depth 5.5 mm with maximum force limits of 1.7 N for pin gauges and 3.4 N for plug gauges).
• Optical datum targets: Locations of optical datum targets relative to pin centres are specified to support consistent optical alignment across single- and multi-fibre variants.
• Intermateability: The standard lists compatible interface combinations (plug–adaptor–plug and plug–receptacle pairings) across the MT-RJ family.

Applications

• Useful for manufacturers of fibre optic connectors, adaptors and receptacles who need to design parts that mechanically intermate with MT-RJ products.
• Applied by cable assembly and termination businesses to ensure plug and receptacle compatibility and manufacturability.
• Relevant to test laboratories and quality teams for verifying mechanical conformance, gauge testing and tolerance checks.
• Adopted in telecommunications, local area network (LAN) hardware, data centers and any systems requiring compact multi-fibre rectangular ferrule connectors.

Related Standards

• Part of the IEC 61754 series covering fibre optic connector interfaces. Designers should consult other IEC 61754 parts for interfaces of different connector families and for cross-referencing intermateability with other connector types.

Keywords: type MT-RJ family of connectors, IEC 61754-18, MT-RJ interface dimensions, fibre optic connector interfaces.

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
61754-18
First edition
2001-12
Fibre optic connector interfaces –
Part 18:
Type MT-RJ connector family
Interfaces de connecteurs pour fibres optiques –
Partie 18:
Famille de connecteurs de type MT-RJ
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD
61754-18
First edition
2001-12
Fibre optic connector interfaces –
Part 18:
Type MT-RJ connector family
Interfaces de connecteurs pour fibres optiques –
Partie 18:
Famille de connecteurs de type MT-RJ
 IEC 2001  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
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Commission Electrotechnique Internationale
PRICE CODE
R
International Electrotechnical Commission
For price, see current catalogue

– 2 – 61754-18  IEC:2001(E)
CONTENTS
1 Scope.4
2 Description .4
3 Interfaces .4
Figure 1a – Plug connector interface – without guide pins.6
Figure 1b – Plug connector interface, without guide pins – Optical datum target
location diagram .8
Figure 1c – Plug connector interface without guide pins – Gauge pin.9
Figure 1d – Plug connector interface without guide pins – Plug gauge .10
Figure 2 – Plug connector interface – with guide pins .11
Figure 3 – Adaptor connector interface .13
Figure 4 – Receptacle connector interface – without ribs .15
Figure 5 – Receptacle connector interface – with ribs .17
Table 1a – Plug connector interface dimensions – without guide pins .7
Table 1b – Tolerance grade table.7
Table 1c – Dimensions of gauge pin .9
Table 1d – Dimensions of plug gauge .10
Table 2a – Plug connector interface dimensions – with guide pins .12
Table 2b – Tolerance grade table.12
Table 3 – Adaptor connector interface dimensions .14
Table 4a – Receptacle connector interface dimensions – without ribs .16
Table 4b – Tolerance grade table.16
Table 5a – Receptacle connector interface dimensions – with ribs .18
Table 5b – Tolerance grade table.18

61754-18  IEC:2001(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
FIBRE OPTIC CONNECTOR INTERFACES –
Part 18: Type MT-RJ connector family
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61754-18 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/1594/FDIS 86B/1627/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 3.
The committee has decided that the contents of this publication will remain unchanged until
2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 4 – 61754-18  IEC:2001(E)
FIBRE OPTIC CONNECTOR INTERFACES –
Part 18: Type MT-RJ connector family
1 Scope
This part of IEC 61754 defines the standard interface dimensions for the type MT-RJ family of
connectors.
2 Description
The parent connector for the type MT-RJ connector family is a plug connector having single or
multiple fibres in a rectangular ferrule nominally 4,4 mm × 2,5 mm aligned by two 0,7 mm
diameter pins and corresponding holes. The conne
...

IEC 61754-18 ®
Edition 1.0 2001-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic connector interfaces –
Part 18: Type MT-RJ connector family

Interfaces de connecteurs pour fibres optiques –
Partie 18: Famille de connecteurs de type MT-RJ

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IEC 61754-18 ®
Edition 1.0 2001-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic connector interfaces –

Part 18: Type MT-RJ connector family

Interfaces de connecteurs pour fibres optiques –

Partie 18: Famille de connecteurs de type MT-RJ

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 33.180.20 ISBN 978-2-8322-1473-2

– 2 – IEC 61754-18:2001 © IEC 2001
CONTENTS
1 Scope . 4
2 Description . 4
3 Interfaces . 4

Figure 1a – Plug connector interface – without guide pins . 6
Figure 1b – Plug connector interface, without guide pins – Optical datum target
location diagram . 8
Figure 1c – Plug connector interface without guide pins – Gauge pin . 9
Figure 1d – Plug connector interface without guide pins – Plug gauge . 10
Figure 2 – Plug connector interface – with guide pins . 11
Figure 3 – Adaptor connector interface . 13
Figure 4 – Receptacle connector interface – without ribs . 15
Figure 5 – Receptacle connector interface – with ribs . 17

Table 1a – Plug connector interface dimensions – without guide pins . 7
Table 1b – Tolerance grade table . 7
Table 1c – Dimensions of gauge pin . 9
Table 1d – Dimensions of plug gauge . 10
Table 2a – Plug connector interface dimensions – with guide pins . 12
Table 2b – Tolerance grade table . 12
Table 3 – Adaptor connector interface dimensions . 14
Table 4a – Receptacle connector interface dimensions – without ribs . 16
Table 4b – Tolerance grade table . 16
Table 5a – Receptacle connector interface dimensions – with ribs . 18
Table 5b – Tolerance grade table . 18

INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
FIBRE OPTIC CONNECTOR INTERFACES –

Part 18: Type MT-RJ connector family

FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61754-18 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This bilingual version (2014-03) corresponds to the monolingual English version, published in
2001-12.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/1594/FDIS 86B/1627/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 3.
The committee has decided that the contents of this publication will remain unchanged until
2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 4 – IEC 61754-18:2001 © IEC 2001
FIBRE OPTIC CONNECTOR INTERFACES –

Part 18: Type MT-RJ connector family

1 Scope
This part of IEC 61754 defines the standard interface dimensions for the type MT-RJ family of
connectors.
2 Description
The parent connector for the type MT-RJ connector family is a plug connector having single or
multiple fibres in a rectangular ferrule nominally 4,4 mm × 2,5 mm aligned by two 0,7 mm
diameter pins and corresponding holes. The connector includes a single coupling latch and a
ferrule spring loaded in the direction of the optical axis. The plug connector has a single male
key which may be used to orientate the connector and the component to which it is mated.
Connector interfaces are configured as a plug without pins, an adaptor and a plug with pins or
alternatively as a plug without pins and a receptacle with pins. Adaptors use ribs to pre-align
ferrules. Receptacles with and without ribs are defined.
3 Interfaces
Subsequent pages define the standard interfaces for the type MT-RJ connector family.
This standard contains the following standard interfaces:
Interface 61754-18-1 MT-RJ plug connector interface, without pins, consisting of
Interface 61754-18-1-1 for single fibre
Interface 61754-18-1-2 for two fibres with a pitch of 0,25 mm
Interface 61754-18-1-3 for two fibres with a pitch of 0,75 mm
Interface 61754-18-1-4 for four fibres with a pitch of 0,25 mm
Interface 61754-18-2 MT-RJ plug connector interface, with pins, consisting of
Interface 61754-18-2-1 for single fibre
Interface 61754-18-2-2 for two fibres with a pitch of 0,25 mm
Interface 61754-18-2-3 for two fibres with a pitch of 0,75 mm
Interface 61754-18-2-4 for four fibres with a pitch of 0,25 mm
Interface 61754-18-3 MT-RJ adaptor interface
Interface 61754-18-4 MT-RJ receptacle interface, with pins, without ribs, consisting of
Interface 61754-18-4-1 for single fibre
Interface 61754-18-4-2 for two fibres with a pitch of 0,25 mm
Interface 61754-18-4-3 for two fibres with a pitch of 0,75 mm
Interface 61754-18-4-4 for four fibres with a pitch of 0,25 mm

Interface 61754-18-5 MT-RJ receptacle interface, with pins, with ribs, consisting of
Interface 61754-18-5-1 for single fibre
Interface 61754-18-5-2 for two fibres with a pitch of 0,25 mm
Interface 61754-18-5-3 for two fibres with a pitch of 0,75 mm
Interface 61754-18-5-4 for four fibres with a pitch of 0,25 mm
The following standards are intermateable.
3.1 Plug-adaptor-plug
Plug without
Adaptor Plug with pins
pins
61754-18-1-1 61754-18-3 61754-18-2-1
61754-18-1-2 61754-18-3 61754-18-2-2
61754-18-1-3 61754-18-3 61754-18-2-3
61754-18-1-4 61754-18-3 61754-18-2-4

3.2 Plug-receptacle – without ribs

Plug without Receptable
pins with pins
61754-18-1-1 61754-18-4-1
61754-18-1-2 61754-18-4-2
61754-18-1-3 61754-18-4-3
61754-18-1-4 61754-18-4-4
3.3 Plug-receptacle – with ribs

Plug without Receptacle
pins with pins
61754-18-1-1 61754-18-5-1
61754-18-1-2 61754-18-5-2
61754-18-1-3 61754-18-5-3
61754-18-1-4 61754-18-5-4
– 6 – IEC 61754-18:2001 © IEC 2001

S P
B
D
E
See detail
L
K M
F
H
T
A G C
- X -
J
See figure 1b
∅W
S
BB
N - Y -
CC
AA
IEC  2429/01
Detail
Figure 1a – Plug connector interface – without guide pins

Table 1a – Plug connector interface dimensions – without guide pins
Dimensions (mm)
Reference Notes
Minimum Maximum
A 4,61 4,69
B 7,11 7,19
C 2,4 2,5
D 4,35 4,45
E 3,8 4
F 2,597 2,603
G 1,45 1,55
H – 5,3
J 0,25 0,5 Radius
K 5,1 –
L 9,35 9,75 1
M 7,9 9
N 82 88 Degrees
P 3,8 4
S – 0,8 Radius
T 0,9 1,1
W  See tolerance grade table
AA 0,63 1,2
BB 1,27 1,42
CC 0,6 0,77
NOTE 1 When reference L = 9,1 mm, the force exerted by the ferrule must be less than or equal to
11,8 N, and when reference L = 9,3 mm, the force exerted by the ferrule must be greater than or
equal to 7,8 N.
NOTE 2 Dimensions apply after termination.

Table 1b – Tolerance grade table
Dimensions (mm)
Reference Notes
Minimum Maximum
1 0,699 0,700 1,3
2 0,699 0,701 1,3
NOTE 1 Append tolerance grade number to the interface number.
NOTE 2 Dimensions apply after termination.
NOTE 3 Each pin-hole shall accept a gauge as shown in figure 1c to a depth of 5,5 mm with a
maximum force of 1,7 N. In addition, both pin-holes of a plug shall accept a gauge as shown in
figure 1d to a depth of 5,5 mm with a maximum force of 3,4 N.

– 8 – IEC 61754-18:2001 © IEC 2001

- Y -
- X -
1 – One fibre
- Y -
- X -
0,125
0,125
2 – Two fibres, 0,25 mm pitch
- Y -
- X -
0,375
0,375
3 – Two fibres, 0,75 mm pitch
- Y -
0,125
0,125
- X -
0,375
0,375
4 – Four fibres, 0,25 mm pitch
IEC  2430/01
NOTE The optical datum target diagram is shown in the figure. The optical datum targets are located on a line X
passing through the two pin-hole centres and located on or symmetrically about a line Y perpendicular to line X
located midway between the two pin-hole centres.
Figure 1b – Plug connector interface, without guide pins –
Optical datum target location diagram

∅BA
0,0005
∅A
BB
BC
IEC  2431/01
Figure 1c – Plug connector interface without guide pins –
Gauge pin
Table 1c – Dimensions of gauge pin
Dimensions (mm)
Reference Notes
Minimum Maximum
Surface roughness 0,1 µm Ra for the
A 0,6985 0,699
length of dimension BC
BA 0,2 0,4
BB 0,2 0,5
BC 5,5 –
– 10 – IEC 61754-18:2001 © IEC 2001
∅0,001
W
∅A
C
∅BA
∅A
BB
0,0005
- W -
BC
IEC  2432/01
Figure 1d – Plug connector interface without guide pins –
Plug gauge
Table 1d – Dimensions of plug gauge
Dimensions (mm)
Reference Notes
Minimum Maximum
Surface roughness 0,1 µm Ra for the
A 0,6985 0,699
length of dimension BC
C 2,5995 2,6005
BA 0,2 0,4
BB 0,2 0,5
BC 6 0,6
Q
FF
S
U
B
E D
∅W
∅V
P
See detail
L
M
K
F
H
T
A C
- F -
G
J
See figure 1b
S
BB
N
- Y -
CC
AA
Detail
IEC  2433/01
Figure 2 – Plug connector interface – with guide pins

– 12 – IEC 61754-18:2001 © IEC 2001
Table 2a – Plug connector interface dimensions – with guide pins
Dimensions (mm)
Reference Notes
Minimum Maximum
A 4,61 4,69
B 7,11 7,19
C 2,4 2,5
D 4,35 4,45
E 3,8 4
F 2,597 2,603
G 1,45 1,55
H – 5,3
J 0,25 0,5 Radius
K 5,1 –
L 9,35 9,75 1
M 7,9 9
N 82 88 Degrees
P 3,8 4
Q – 2,25
S – 0,8 Radius
T 0,9 1,1
U 0,15 –
V – 0,4
W  See tolerance grade table
AA 0,63 1,2
BB 1,27 1,42
CC 0,6 0,77
FF 1,5 –
NOTE 1 When reference L = 9,1 mm, the force exerted by the ferrule must be less than or equal
to 11,8 N and when reference L = 9,3 mm the force exerted by the ferrule must be greater than or
equal to 7,8 N.
NOTE 2 Dimensions apply after termination.

Table 2b – Tolerance grade table
Dimensions (mm)
Reference Notes
Minimum Maximum
1 0,698 0,699 1
2 0,697 0,699 1
NOTE 1 Append tolerance grade number to the interface number.
NOTE 2 Dimensions apply after termination.

L
P
K H
E
G
M
N
T
R full
S×S chamfer
A C
J
EE
D
DD
B
IEC  2434/01
Figure 3 – Adaptor connector interface

– 14 – IEC 61754-18:2001 © IEC 2001
Table 3 – Adaptor connector interface dimensions
Dimensions (mm)
Reference Notes
Minimum Maximum
A 4,7 4,78
B 7,2 7,28
C 2,51 2,61
D 4,46 4,56
E 4,1 5
G 1,15 1,25
H 5,45 5,85
...