Internal combustion engines -- Piston rings

ISO 6626-2:2013 specifies the essential dimensional features of coil-spring-loaded oil control rings made of cast iron, types DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP. It is applicable to those piston rings in sizes 60 mm to 110 mm, inclusive, for reciprocating internal combustion engines for road vehicles and other applications.

Moteurs à combustion interne -- Segments de piston

General Information

Status
Published
Publication Date
28-Jul-2013
Current Stage
9092 - International Standard to be revised
Start Date
18-Feb-2021
Ref Project

RELATIONS

Buy Standard

Standard
ISO 6626-2:2013 - Internal combustion engines -- Piston rings
English language
36 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 6626-2
Second edition
2013-08-01
Internal combustion engines —
Piston rings —
Part 2:
Coil-spring-loaded oil control rings of
narrow width made of cast iron
Moteurs à combustion interne — Segments de piston —
Partie 2: Segments racleurs régulateurs d’huile étroits, en fonte, mis
en charge par ressort hélicoïdal
Reference number
ISO 6626-2:2013(E)
ISO 2013
---------------------- Page: 1 ----------------------
ISO 6626-2:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

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

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6626-2:2013(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Overview ....................................................................................................................................................................................................................... 1

4 Piston ring types and designation ...................................................................................................................................................... 2

4.1 DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP types .................................................................................... 2

4.2 Type DSF-C — Coil-spring-loaded bevelled edge oil control ring, chromium-plated, and

profile ground .......................................................................................................................................................................................... 2

4.3 Type DSF-CNP — Coil-spring-loaded bevelled-edge oil control ring, chromium-plated not

profile ground .......................................................................................................................................................................................... 3

4.4 Type SSF — Coil-spring-loaded slotted oil control ring ...................................................................................... 4

4.5 Type GSF — Coil-spring-loaded double bevelled oil control ring ............................................................... 5

4.6 Type DSF — Coil-spring-loaded bevelled edge oil control ring .................................................................... 6

4.7 Type DSF-NG — Coil-spring-loaded bevelled-edge oil control ring (face geometry similar

to type DSF-C) .......................................................................................................................................................................................... 7

4.8 Type SSF-L — Coil-spring-loaded slotted oil control ring with 0,4 mm nominal

land width ................................................................................................................................................................................................... 8

5 Common features ................................................................................................................................................................................................. 9

5.1 Oil drainage by slots or holes ..................................................................................................................................................... 9

5.2 Plating thickness — DSF-C and DSF-CNP (coil-spring-loaded bevelled edge oil control

ring, chromium plated) .................................................................................................................................................................11

5.3 Peripheral edges at gap of chromium plated oil control rings....................................................................12

6 Coil springs ..............................................................................................................................................................................................................12

6.1 Types of coil spring ..........................................................................................................................................................................12

6.2 Coil spring excursion (extended gap) ...............................................................................................................................14

6.3 Position of coil spring gap and fixing ................................................................................................................................14

6.4 Material ......................................................................................................................................................................................................14

7 Tangential force and nominal contact pressure ...............................................................................................................14

7.1 Tangential force ...................................................................................................................................................................................14

7.2 Force factors ...........................................................................................................................................................................................14

7.3 Tangential force, F .............................................................................................................................................................................

t 15

7.4 Classes of nominal contact pressure, p ..........................................................................................................................

o 15

8 Dimensions and tangential forces ...................................................................................................................................................17

Bibliography .............................................................................................................................................................................................................................36

© ISO 2013 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 6626-2:2013(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received. www.iso.org/patents

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.
The committee responsible for this document is ISO/TC 22, Road vehicles.

This second edition cancels and replaces the first edition (ISO 6626-2:2003), which has been

technically revised.

ISO 6626 consists of the following parts, under the general title Internal combustion engines — Piston rings:

— Part 2: Coil-spring-loaded oil control rings of narrow width made of cast iron
— Part 3: Coil-spring-loaded oil control rings made of steel

ISO 6626:1989 (Internal combustion engines — Piston rings — Coil-spring-loaded oil control rings) is to be

withdrawn and replaced with a part 1 (i.e. a revision) at a later date.
iv © ISO 2013 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 6626-2:2013(E)
Introduction

ISO 6626 (all parts) is one of a series of International Standards dealing with piston rings for reciprocating

[2] [3]

internal combustion engines. The others are ISO 6621 (all parts), ISO 6622 (all parts), ISO 6623,

[4] [5] [6]
ISO 6624 (all parts), ISO 6625 and ISO 6627.
© ISO 2013 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 6626-2:2013(E)
Internal combustion engines — Piston rings —
Part 2:
Coil-spring-loaded oil control rings of narrow width
made of cast iron
1 Scope

This part of ISO 6626 specifies the essential dimensional features of coil-spring-loaded oil control

rings made of cast iron, types DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP. It is applicable to those

piston rings in sizes 60 mm to 110 mm, inclusive, for reciprocating internal combustion engines for road

vehicles and other applications.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable to its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 6621-2, Internal combustion engines — Piston rings — Part 2: Inspection measuring principles

ISO 6621-3, Internal combustion engines — Piston rings — Part 3: Material specifications

ISO 6621-4, Internal combustion engines — Piston rings — Part 4: General specifications

ISO 6621-5, Internal combustion engines — Piston rings — Part 5: Quality requirements

3 Overview

The coil-spring-loaded oil control ring types are specified in Figures 1 to 8. Their common features and

the dimensions of the features are specified in Tables 1 and 2 and shown in Figures 9 to 11. Essential

features of coil-springs are shown in Figures 12 to 16. Table 3 specifies different classes of contact

pressure. Tables 4 to 9 give the dimensions and forces of coil-spring-loaded oil control rings.

The common features and dimensional tables presented in this part of ISO 6626 constitute a broad

range of variables and, in selecting a particular ring type, the designer shall bear in mind the conditions

under which it will be required to operate.

It is also essential that the designer refer to the specifications and requirements of ISO 6621-3 and

ISO 6621-4 before completing a selection.

For the cast iron part, the recommended material is class 10 and shall be in accordance with ISO 6621-3.

For special applications, material classes 20 to 50 may be used.

Variation from these in face design and spring groove may be used, as recommended by individual

manufacturers, in plain or chromed versions.
© ISO 2013 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 6626-2:2013(E)
4 Piston ring types and designation
4.1 DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP types
4.1.1 General features and dimensions
See Figure 1 and Tables 4, 5, 6, 7, 8 and 9.
Figure 1 — Types DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP

4.2 Type DSF-C — Coil-spring-loaded bevelled edge oil control ring, chromium-plated,

and profile ground
4.2.1 General features and dimensions
See Figure 2 and Table 4.
2 © ISO 2013 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
In accordance with ISO 6621-2, land offset
Figure 2 — Type DSF-C

4.2.2 Designation of a type DSF-C piston ring in accordance with this part of ISO 6626

EXAMPLE A coil-spring-loaded bevelled edge oil control ring, chromium plated and profile ground (DSF-C),

of nominal diameter d = 80 mm (80), nominal ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat

1 1

treated, material subclass 11 (MC11), having a selected closed gap of 0,20 mm min. (S020), a chromium layer

thickness on the lands of 0,10 mm (CR2), reduced slot length (WK), a coil spring with reduced heat set (WF),

and a variable pitch with coil diameter d ground (CSE), with tangential force F in accordance with the medium

7 t

nominal contact pressure class (PNM) and the ring marked with the manufacturer’s mark (MM) is designated as

follows. Parameters in parentheses are used in the ISO ring designation:
Piston ring ISO 6626-2 DSF-C - 80 × 2,5 - MC11/S020 CR2 WK WF CSE PNM MM

4.3 Type DSF-CNP — Coil-spring-loaded bevelled-edge oil control ring, chromium-plat-

ed not profile ground
4.3.1 General features and dimensions
See Figure 3 and Tables 5.
© ISO 2013 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
In accordance with ISO 6621-2, land offset
Figure 3 — Type DSF-CNP

4.3.2 Designation of a type DSF-CNP piston ring in accordance with this part of ISO 6626

EXAMPLE A coil-spring-loaded slotted oil control ring (DSF-CNP) of nominal diameter d = 100 mm (100),

nominal ring width h = 2,0 mm (2,0), made of grey cast iron, non-heat treated, material subclass 12 (MC12),

constant spring pitch (CSN) and tangential force F in accordance with the low nominal contact pressure class

(PNL) is designated as follows. Parameters in parentheses are used in the ISO ring designation:

Piston ring ISO 6626-2 DSF-CNP 100 × 2 - MC12/CSN PNL
4.4 Type SSF — Coil-spring-loaded slotted oil control ring
4.4.1 General features and dimensions
See Figure 4 and Table 6.
4 © ISO 2013 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
In accordance with ISO 6621-2, land offset
Figure 4 — Type SSF

4.4.2 Designation of a type SSF piston ring in accordance with this part of ISO 6626

EXAMPLE A coil-spring-loaded slotted oil control ring (SSF) of nominal diameter d = 80 mm (80), nominal

ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat treated, material subclass 12 (MC12), constant

spring pitch (CSN) and tangential force F in accordance with the low nominal contact pressure class (PNL) is

designated as follows. Parameters in parentheses are used in the ISO ring designation:

Piston ring ISO 6626-2 SSF- 80 × 2,5 - MC12/CSN PNL
4.5 Type GSF — Coil-spring-loaded double bevelled oil control ring
4.5.1 General features and dimensions

See Figure 5 and Table 7. Top-side marking is mandatory in accordance with ISO 6621-4.

© ISO 2013 – All rights reserved 5
---------------------- Page: 10 ----------------------
ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
2 top side identification mark
In accordance with ISO 6621-2, land offset
Figure 5 — Type GSF

4.5.2 Designation of a type GSF piston ring in accordance with this part of ISO 6626

EXAMPLE A coil-spring-loaded double bevelled oil control ring (GSF) of nominal diameter d = 75 mm (75),

nominal ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat treated, material subclass 12 (MC12), with

constant spring pitch (CSN) and tangential force F in accordance with the low nominal contact pressure class

(PNL) is designated as follows. Parameters in parentheses are used in the ISO ring designation:

Piston ring ISO 6626-2 GSF- 75 × 2,5 - MC12/CSN PNL
4.6 Type DSF — Coil-spring-loaded bevelled edge oil control ring
4.6.1 General features and dimensions
See Figure 6 and Table 7.
6 © ISO 2013 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
In accordance with ISO 6621-2, land offset
Figure 6 — Type DSF

4.6.2 Designation of a type DSF piston ring in accordance with this part of ISO 6626

EXAMPLE A coil-spring-loaded double bevelled oil control ring (DSF) of nominal diameter d = 90 mm (90),

nominal ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat treated, material subclass 12 (MC12), with

constant spring pitch (CSN) and tangential force F in accordance with the reduced nominal contact pressure class

(PNR) is designated as follows. Parameters in parentheses are used in the ISO ring designation:

Piston ring ISO 6626-2 DSF- 90 × 2,5 - MC12/CSN PNR

4.7 Type DSF-NG — Coil-spring-loaded bevelled-edge oil control ring (face geometry

similar to type DSF-C)
4.7.1 General features and dimensions
See Figure 7 and Table 8.
© ISO 2013 – All rights reserved 7
---------------------- Page: 12 ----------------------
ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
In accordance with ISO 6621-2, land offset
Figure 7 — Type DSF-NG

4.7.2 Designation of a type DSF-NG piston ring in accordance with this part of ISO 6626

EXAMPLE A coil-spring-loaded slotted oil control ring (DSF-NG) of nominal diameter d = 80 mm (80),

nominal ring width h = 2,0 mm (2,0), made of grey cast iron, non-heat treated, material subclass 12 (MC12),

constant spring pitch (CSN) and tangential force F in accordance with the reduced nominal contact pressure class

(PNR) is designated as follows. Parameters in parentheses are used in the ISO ring designation:

Piston ring ISO 6626-2 DSF-NG - 80 × 2,0 - MC12/CSN PNR

4.8 Type SSF-L — Coil-spring-loaded slotted oil control ring with 0,4 mm nominal land

width
4.8.1 General features and dimensions
See Figure 8 and Table 9.
8 © ISO 2013 – All rights reserved
---------------------- Page: 13 ----------------------
ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
In accordance with ISO 6621-2, land offset
Figure 8 — Type SSF-L

4.8.2 Designation of a type SSF-L piston ring in accordance with this part of ISO 6626

EXAMPLE A coil-spring-loaded slotted oil control ring (SSF-L) of nominal diameter d = 80 mm (80), nominal

ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat treated, material subclass 12 (MC12), constant

spring pitch (CSN) and tangential force F in accordance with the reduced nominal contact pressure class (PNR) is

designated as follows. Parameters in parentheses are used in the ISO ring designation:

Piston ring ISO 6626-2 SSF-L - 80 × 2,5 - MC12/CSN PNR
5 Common features
5.1 Oil drainage by slots or holes
5.1.1 Arrangement of slots
5.1.1.1 General
Figure 9 shows the arrangement of oil drainage slots.
5.1.1.2 Slot length
5.1.1.3 Standard slot length
Slot length, w , shall be equal to bridge length, w .
1 2
© ISO 2013 – All rights reserved 9
---------------------- Page: 14 ----------------------
ISO 6626-2:2013(E)
The maximum difference between w and w shall be 4 mm.
1 2
5.1.1.4 Reduced slot length — Code WK

Oil control rings with reduced slot length will retain the same number of slots and the same angular

spacing. The maximum difference between w and w for the standard slot length does not apply.

1 2
See Table 1.
Dimensions in millimetres
a) 8 slots for 60 ≤ d < 80 b) 10 slots for 80 ≤ d ≤ 110
1 1
Cutter diameter
Figure 9 — Arrangement of slots
Table 1 — Reduced slot length
Dimensions in millimetres
d w (range of nominal
1 1
values)
60 ≤ d < 80 6 ... 11
80 ≤ d < 110 8 ... 13
5.1.2 Arrangement of holes

The arrangement of holes is shown in Figure 10. Deviating arrangements shall be agreed between the

manufacturer and customer.
10 © ISO 2013 – All rights reserved
---------------------- Page: 15 ----------------------
ISO 6626-2:2013(E)
Figure 10 — Arrangement of holes
5.1.2.1 Diameter and number of holes

The diameter, d , and number, n, of holes to be agreed between the manufacturer and customer.

5.2 Plating thickness — DSF-C and DSF-CNP (coil-spring-loaded bevelled edge oil con-

trol ring, chromium plated)
See Figure 11 and Table 2.
Figure 11 — Plating thickness
Table 2 — Plating thickness
Dimensions in millimetres
Code Thickness
min.
CR0 0,03
CR1 0,05
CR2 0,10
Plating thickness tolerances are given in ISO 6621-4.
© ISO 2013 – All rights reserved 11
---------------------- Page: 16 ----------------------
ISO 6626-2:2013(E)
5.3 Peripheral edges at gap of chromium plated oil control rings
For features and their dimensions, see ISO 6621-4.
6 Coil springs
6.1 Types of coil spring

All values in the dimensional tables of Clause 8 are based on cylindrical coil springs made of round wire.

The three designs shown in Figures 12 to 14 are common. The use of different spring designs may be

agreed between the manufacturer and client. Changed spring groove configurations and dimensions

could then be necessary.
Key
1 diameter of wire
Figure 12 — Type CSN coil spring with constant pitch
Key
1 diameter of wire
2 approximately 0,8 times the diameter of wire
Figure 13 — Type CSG coil spring with constant pitch (coil diameter, d , ground)
12 © ISO 2013 – All rights reserved
---------------------- Page: 17 ----------------------
ISO 6626-2:2013(E)
Key
1 diameter of wire
2 approximately 0,8 times the diameter of wire
Figure 14 — Type CSE coil spring with variable pitch (coil diameter, d , ground)
Dimensions in millimetres
Key
1 spring gap
2 area with small pitch
Latch pin free length
Latch pin fixed length
Figure 15 — Position of area with small pitch
© ISO 2013 – All rights reserved 13
---------------------- Page: 18 ----------------------
ISO 6626-2:2013(E)
6.2 Coil spring excursion (extended gap)

Coil spring excursion, f , is the distance between the ends of the ring gap, with unstressed ring, measured

in the middle of the spring groove (see Figure 16). The maximum value of f shall not exceed 0,13 d .

1 1
6.3 Position of coil spring gap and fixing

The spring gap shall be approximately 180° from the gap and the spring gap ends fixed with a connecting

or latch pin.
Figure 16 — Coil spring excursion
6.4 Material

Coil springs are made of valve spring wire, oil heat-treated. A suitable material for coil spring expanders

is subclass 62 and shall be in accordance with ISO 6621-3.

Springs are available with two different heat-set-resistance levels (loss of tangential force under load

and temperature):
— standard heat resistance;
— reduced heat set, code WF.

Test conditions and the permissible loss of tangential forces shall be as specified in ISO 6621-5.

7 Tangential force and nominal contact pressure
7.1 Tangential force

The tangential force of coil-spring-loaded oil control rings is mainly determined by the force of the

spring. The cast iron part itself has a very small tangential force due to its low radial wall thickness and

the decreased ratio “total free gap/nominal diameter”.

The tangential force measurement only can be used because of the flexible design of the cast iron part

of the coil-spring-loaded oil control rings.
7.2 Force factors

Because of the small contribution of the cast iron part in the tangential force, force factors are not

necessary when additional features, materials or both (other than grey cast iron with modulus of

elasticity of 100 GN/m ) are being used.
14 © ISO 2013 – All rights reserved
---------------------- Page: 19 ----------------------
ISO 6626-2:2013(E)
7.3 Tangential force, F
7.3.1 General
The tangential force, F , of a spring-loaded oil control ring is determined by
a) nominal diameter, d , in millimetres,
b) land width, h , in millimetres, and

c) required nominal contact pressure, p , in newtons per square millimetre (N/mm ), calculated

using Formula (1):
Fd=⋅ ⋅⋅2 hp⋅ (1)
to15

The land width, h , depends on the ring type, nominal diameter and ring width. The nominal contact

pressure, p , can be selected over a wide range to suit the application and the required oil scraping effect.

7.3.2 Specific tangential force, F

The specific tangential force, F , is that required to maintain a spring-loaded oil control ring at a unit

contact pressure, p , of 1 N/mm using Formula (2):
Fd=⋅ ⋅⋅2 hp⋅ (2)
tc 15 ou
In Clause 8, F is tabulated for every ring type.
7.3.3 Actual tangential force, F , and tolerance

The actual tangential force of a spring-loaded oil control ring can be calculated with the F value and the

required nominal contact pressure from using Formula (3):
pF⋅
otc
F = (3)

The tolerance on F is the actual value F ± 20 %. Actual values of tangential force should be rounded up

t t
or down in accordance with ISO 6621-4.
7.4 Classes of nominal contact pressure, p

The nominal contact pressure, p , decreases with increasing nominal diameter, d . The correlation

o 1
between p and d for medium contact pressure (code PNM) is given by Formula (4):
o 1
pd=−0,,010⋅+25 (4)

The range of the nominal contact pressure has been subdivided into six classes. The nominal contact

pressure for all classes can be calculated by a factor in relation to PNM or by a formula, according to Table 3.

© ISO 2013 – All rights reserved 15
---------------------- Page: 20 ----------------------
ISO 6626-2:2013(E)
Table 3 — Classes of nominal contact pressure, p
Code Factor Formula Meaning
PNV 1,60 pd=−0,,0160⋅+4 000 Very high
pd=−0,,0125⋅+3125
PNH 1,25 High
PNM 1,00 pd=−0,,0100⋅+2 500 Medium
pd=−0,,0180⋅+2 000
PNR 0,80 Reduced
PNL 0,60 pd=−0,,0060⋅+1 500 Low
pd=−0,,0045⋅+1 125
PNE 0,45 Very low
Figure 17 shows characteristic values of p depending on d .
o 1
Figure 17 — Characteristic values of p depending on d
o 1
16 © ISO 2013 – All rights reserved
---------------------- Page: 21 ----------------------
ISO 6626-2:2013(E)
8 Dimensions and tangential forces

The dimensions and tangential force are shown in Tables 4 to 9. Land spacing B3 shall be agreed between

the manufacturer and customer.
The dimensions of Tables 4 to 9 are in millimetres.
© ISO 2013 – All rights reserved 17
---------------------- Page: 22 ----------------------
ISO 6626-2:2013(E)

Table 4 — Dimensions and tangential forces of DSF-C coil-spring-loaded oil control rings of

narrow ring width
Radial thickness
Ring width Radial wall thickness Land width
Closed
over coil spring
gap
h a h
1 1 5
d 1 2 1 2 Tol. 1 2 Tol. 1 2
64 0,20 2,15 2,20
65 +0,20
70 −0,010
−0,030
72 For
phos-
phated
74 2,75 3,00 2,0 2,5 2,25 2,30 ±0,15 0,25 0,30
surface:
within a
75 0 0 ±0,07 ±0,07
ring
−0,005
−0,25 −0,25
0,15
−0,030
max.
81 0,25
82 +0,25
84 2,35 2,40
18 © ISO 2013 – All rights reserved
Nominal
diameter
---------------------- Page: 23 ----------------------
ISO 6626-2:2013(E)
Table 4 — (continued)
Coil spring Coil spring
Groove depth Tangential force
Groove depth
and bridge
groove diameter diameter a
a F
d d
13 tc
14 7
1 2 1 2 1 2 1 2 1 2
15,0 18,0
15,3 18,3
15,5 18,6
15,8 18,9
16,0 19,2
16,3 19,5
16,5 19,8
16,8 20,1
17,0 20,4
17,3 20,7
17,5 21,0
17,8 21,3
18,0 21,6
18,3 21,9
0,35 0,4 1,35 1,40 1,50 1,70 1,40 1,60 18,5 22,2
±0,10 ±0,10 0 0 +0,10 +0,10 0 0 18,8 22,5
−0,15 −0,15 0 0 -0,10 -0,10
19,0 22,8
19,3 23,1
19,5 23,4
19,8 23,7
20,0 24,0
20,3 24,3
20,5 24,6
20,8 24,9
21,0 25,2
21,3 25,5
21,5 25,8
21,8 26,1
22,0 26,4
22,3 26,7
© ISO 2013 – All rights reserved 19
---------------------- Page: 24 ----------------------
ISO 6626-2:2013(E)
Table 4 — (continued)
Radial thickness
Ring width Radial wall thickness Land width
Closed
over coil spring
gap
h a h
1 1 5
1 2 1 2 Tol. 1 2 Tol. 1 2
94 2,45 2,50
98 −0,01
−0,03
100 2,85 3,10 For 0,
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.