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UDC 621.855
Ref. No.: ISO/R 806 - 1967 (E)
IS0
I NT ERN AT I ON AL ORGAN I2 AT1 ON FOR STAND AR D I ZATl O N
IS0 RECOMMEN DATION
R 606
SHORT PITCH TRANSMISSION PRECISION ROLLER CHAINS
AND CHAIN WHEELS
1st E D I T I O N
July 1967
COPYRIGHT RESERVED
IS0 Recommendations and IS0 Standards
The copyright of
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 606, Short Pitch Transmission Precision Roller Chains and
Chain Wheels, was drawn up by Technical Committee ISO/TC 100, Chains and Chain Wheels
for Power Transmission and Conveyors, the Secretariat of which is held by the British Standards
Institution (BSI).
Work on this question by the Technical Committee began in 1961 and led, in 1964, to the
adoption of a Draft IS0 Recommendation.
In February 1965, this Draft IS0 Recommendation (No. 799) was circulated to all the
IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
nature, by the following Member Bodies:
Argentina India Spain
Australia Italy Sweden
Belgium Japan Turkey
Chile
New-Zealand U.A.R.
Czechoslovakia Poland United Kingdom
Denmark Republic U.S.A.
France of South Africa
Germany Romania
One Member Body opposed the approval of the Draft:
U.S. S. R.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in July 1967, to accept it as an IS0 RECOMMENDATION.
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ISO/R 606 . 1967 (E)
CONTENTS
Page
Introduction . 7
1 . Scope . 7
. .
2 Chains 7
2.1 Nomenclature . 7
2.2 Designation . 9
2.3 Dimensions . 9
2.4 Breaking loads . 9
..............................
2.5 Proof loading 9
2.6 Length accuracy . 9
Key to Tables 1, 1M. 2 and 2M . 10
Chain dimensions. measuring loads and breaking loads of base chains:
Table 1 (Inch-pound units) . 11-12
Table IM (Metric units) . 13-14
Chain dimensions. measuring loads and breaking loads of cycle and moped
.
chains :
15-16
Table 2 (Inch-pound units) .
Table 2M (Metric units) . 15-16
2.7 Marking . 17
3 . Chain wheels . 17
3.1 Nomenclature . 17
3.2 Diametral dimensions of wheel rim . 17
3.2.1 Nomenclature . 17
3.2.2 Dimensions . 17
3.3 Wheel tooth gap forms . 18
3.3. I Nomenclature . 18
3.3.2 Dimensions . 18
3.4 Tooth heights and tip diameters . 19
3.4.1 Nomenclature . 19
3.4.2 Dimensions . 19
3.5 Wheel rim profiles . 19
3.5.1 Nomenclature . 19
3.5.2 Dimensions . 20
3.6 Ra.dia1 run-out . 20
3.6.1 Nomenclature . 20
3.6.2 Dimensions . 20
3.7 Axial run-out (wobble) . 20
3.7.1 Nomenclature . 20
3.7.2 Dimensions . 21
3.8 Pitch accuracy of wheel teeth . 21
3.9 Rangeofteeth . 21
3.10 Bore tolerance . 21
................................ 21
3.11 Marking
Z . Pitch circle diameters . 22
Appendix
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ISO/R 606 - 1987 (E)
IS0 Recommendation R 606 July 1967
SHORT PITCH TRANSMISSION PRECISION ROLLER CHAINS
AND CHAIN WHEELS
INTRODUCTION
The provisions of this IS0 Recommendation have been arrived at by including sizes of chains used
by the majority of countries in the world, and by unifying dimensions, strength and other data in
respect of which current national standards were differing and at the same time eliminating
certain side ranges listed in some national standards for which it was considered a universal
usage had not been established.
The whole applicational field open to this medium of transmission has been covered by the
ranges of chains already established. To achieve this the sizes of 12.7 mm (0.5 in) to 76.2 mm
(3.0 in) pitch inclusive have been duplicated by the inclusion of chains derived from standards
originating in the western hemisphere and centred around USAS1 (suffix A) and, on the other
hand, by chains representing the unification of the principal standards originating in Europe
and centred around BSI (suffix B), the two being complementary for the coverage of the widest
possible field of application.
The part of this IS0 Recommendation covering chain wheels represents the unification of all
the relevant national standards in the world and includes, in particular, complete tolerances
relating to tooth form which are absent from most current national standards.
The dimensions of chain specified ensure complete interchangeability of any given size and provide
interchangeability of individual links of chains for repair purposes.
1. SCOPE
This IS0 Recommendation applies to short pitch precision roller chains of simple and multiplex
construction suitable for the mechanical transmission of power and allied applications, together
with the tooth gap forms and rim profiles of their associated chain wheels. It covers dimensions,
tolerances, measuring loads and minimum breaking loads.
2. CHAINS
2.1 Nomenclature
The illustrations shown in this clause and in the key to Tables 1, lM, 2 and 2M, do not
define the actual form of the chain plates.
Roller chain, simple Roller chain, multiple (triplex)
FIG. 1. - Roller chains
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IÇO/R 606 - 1967 (E)
Bush ’
Inner link
Outer plate
Ourer plate
lnterrnediote
plates
Bearing
tuns
Bearing pins
Outer plate rn
Outer
plate
Outer link simple Outer link duplex
Outer plate
Fixed
connecting
pin
Spring .Detachable
fastener Diate
Connecting link with spring fastener
Fixed
connecting
pin
Fastener
Other detachable connecting links
(Fasteners may be of various designs. Drawings indicate only their position.)
Cranked
/piate
connecting
Cranked
I
pin plate
Inner
plate (schematic) plate (riveted )
Cranked link single Cranked link double
FIG. 2. - Types of links
Dimensional definitions are contained in the key to Tables 1, IM, 2 and 2M.
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I
ISO/R 606 - 1967 (E)
2.2 Designation
Transmission precision roller chains are designated by the standard IS0 numbers given
in the Tables 1, IM, 2 and 2M, first column, the first two digits expressing the pitch in
1 and IM are supplemented by a
sixteenths of an inch. The chain numbers in Tables
hyphenated suffix 1 for simple chain, 2 for duplex chain, 3 for triplex chain etc., e.g. 16B-1,
16B-2, 16B-3, etc.
2.3 Dimensions
Chains should conform to the dimensions given in Tables 1, lM, 2 and 2M. Maximum
and minimum dimensions are specified to ensure interchangeability of links as produced
by different makers of chain. They represent limits for interchangeability, but are not
the actual tolerances that should be used in manufacture.
2.4 Breaking loads
The test length should have a minimum of 5 free pitches. The ends should be attached to
the testing machine shackles by a pin through the plate holes or the bushes or by the bush
common to an inner or outer link. The shackles should be so designed as to allow universal
movement; the actual method to be used is left to the discretion of the manufacturer.
Tests in which failures occur adjacent to the shackles should be disregarded.
The minimum tensile breaking loads should be those given in Tables 1, lM, 2 and 2M.
2.5 Proof loading
All chains should be proof loaded to one-third of the minimum tensile breaking load given
1, lM, 2 and 2M.
in Tables
2.6 Length accuracy
Finished chains should be measured after proof loading (where applicable) but before
lubricating.
The standard length for measurement should be 49 times the pitch of the chain or 1524 mm
(60 in), whichever is less, and should terminate at each end in an inner link.
The chain should be supported throughout its entire length, and the measuring load given
in Tables 1, lM, 2 and 2M, should be applied.
To comply with this IS0 Recommendation, the length should be the nominal length subject
to the tolerance
The length accuracy of chains which have to work in parallel should be within the above
limits but matched by agreement with the manufacturer.
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ISO/R 606 - 1967 (E)
Oder Cranked lnner
plate plote plate
Pitch
Cranked link
Dimension c represents the clearonce between the cranked link plates and the straight plates available during
articulation.
rpb* i
Plain pin Shouldered pin Section through chain
The chain path depth h, is the minimum depth ofchannel through which the assembled chain will pass.
Duplex Triplex
Simple
The overall width ofa chain with a joint fastener is equal to the width over the bearing pins b,, b, or b, plus b,
for riveted pin end (or plus I .6 b, for headed pin end) if fastener is on one side only, or plus 2 b, if fastener
is on both sides.
The width over bearing pins for chains wider thon triplex = br + pt (number ofstrands in chain - 1 ).
FIG. 3. - Key to Tables 1, lM, 2 and 2M
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ISO/R 606 - l!
nsions, measuring loads & breaking loads of base chains
13 14
15 16 1 17 I 18
19 20 ~ 21 1 22
23 1 24 1 25
1 I
-
Addit-
Width Width
ional
Trans-
over between
Width over
width
verse
Measuring load
Breaking load
inner outer
bearing pins
for joint
pitch
link
plates
fastener
**
-
Simple
Duplex Triplex Simple Duplex Duplex
Tri pl ex Simple Triplex
b2
b3 b4 b6
b6 b,
- -
Pt
min. min. min.
max. min. max. max. max.
max.
in in in in in in lb
in lb lb lb lb lb
0.222 0.188 0.193
0.34 0.57 0.79 o. 12 11 22 33 1750
1 O00 2 500
0.403 0.336 0.341 0.53
0.94 1.34 0.13 16 32 48 2 O00 3 800 5 600
0.566 0.440 0.445 0.70 1.27 1.84
0.15 28 56 84 3 100 6 200 9 300
0.548 0.445
0.450 0.67 1.22 1.77 0.15 28 56 84 4 O00 7 O00
10 O00
0.713 0.545 0.550
0.86 1.57 2.28 0.16 44 88 132 4 900 9 800
14 700
0.653 0.523 0.528 0.77 1.43
2.08 0.16 44 88 132 5 O00 10 O00 15 O00
0.897 0.699 0.704 1 .O6 1.96 2.86 63 126
0.18 189 7 O00 14 O00 21 O00
0.766 0.615 0.620 0.89 1.66 2.43 0.18 63 126 189 6 500 13 O00 19 500
1.153 0.890 0.895
1.32 2.47 3.62 0.21 112 224 336 12 500 25 O00 37 500
1.255 1 .O02 1 .O07 1.42 2.68 3.93
0.21 112 224 336 9 500 19 O00 28 500
1.408 1.081 1.086 1.62 3.03 4.45 0.24 350 525 39 O00
175 19 500 58 500
1.435
1.142 1.147 1.70 3.14 4.57 0.24 175 350 525 14 500 29 O00 43 500
1.789 1.396 1.401
2.00 3.79 5.58 0.26 250 500 750 28 O00 56 O00 84 O00
1.904 1.493 1.498 2.10 4.01 5.91 0.26 44 O00
250 500 750 22 O00 66 O00
1.924 1.464 1.469 2.16 4.08 6 .O0 0.29 340 680 38 O00 76 O00 14 O00
1 020
2.345
1.834 1.839 2.56 4.91 7.25 0.29 340 680 1 020 29 O00 58 O00 87 O00
2.305 1.780 1.785 2.58 4.89 7.20 DO O00
0.31 450 900 1350 50 O00 50 O00
2.305 1.794 1.799 2.65 4.96 7.26 900 38 O00 76 O00 14 O00
0.31 450 1350
2.817 2.161 2.166 3.16 5.98 8.80 0.40 700 1 400 2 100 78 O00 56 O00 34 O00
2.846 2.195 2.200
3.25 6.10 8.95 0.40 700 1 400 2 100 59 O00 18 O00 77 O00
3.458 2.670 2.675 3.76 7.22 2 O00 12 500 25 O00 37 500
10.68 0.41 1 O00 3 O00
3.591 2.778 2.783 3.90 7.50 11.09 2 O00 3 O00 90 O00 30 O00 70 O00
0.41 1 O00
-
- -
44 O00
4.197 3.202 3.207 4.51 8.71 1370 2 740 22 O00
0.46
- - -
4.720 50 O00 20 O00
3.623 3.628 5.15 9.87 0.51 1 790 3 580
- - -
5.365 4.087 4.092 5.80 11.17 4 540 O2 O00 34 O00
0.56 2 270
-
- 11-12 -
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TABLE 1. - (Inch-pound units) Chain dimensions, mt
-
1 2 3 4 5 6 7 8
9 10 I 11 I 12
13
Outer
Width Bearing
Chain Inner
inter- Cranked link
Trans
Roller between pin Bush
Pitch
path plate mediate
dimensions
verse
diametei inner body bore
depth depth plate
pitch
IS0 plates diametei
*
depth
chain
number
- - - - - -
-
-
4 4 1-
d, b, hl h2 h3 11
P
c
Pt
max. min. max. min. min.
max. max. min. min.
-
in in in
in in in in in in in
in in
-_
05B 0.315 0.197 0.118 0.091 0.290
0.093 0.280 0.280 0.146 O. 146
0.003 0.22;
06B 0.375 0.250 0.225 0.129 0.131 0.335 0.325
0.325 0.170 0.170 0.003
0.40:
OSA 0.500 0.313 0.313 O. 156 O. 158 0.485 0.475
0.410 0.208 0.240 0.003
0.56f
08B 0.500 0.305 0.175
0.335 O. 177 0.475 0.465 0.430 0.223 0.241
0.003 0.541
10A 0.625 0.400 0.375 0.200 0.202 0.604
0.594 0.513 0.260 0.300 0.004
0.71:
1OB 0.625 O. 400 0.380 0.200 0.202 0.590 0.580 0.540
0.280 0.300 0.004 0.65:
12A 0.750 0.469 0.500 0.234
0.236 0.722 0.712 0.615 0.31 1 0.360
0.004 0.89;
12B 0.750 0.475 0.460 0.225 0.227
0.645 0.635 0.635 0.328 0.328
0.004 0.76f
16A
1 .O00 0.625 0.625 0.312 0.314 0.960
0.950 O. 820 0.415 0.480
0.005 1.15:
16B 1 .O00
0.625 0.670 0.326 0.328 O. 840 0.830
0.830 0.439 0.439 0.005 1.25'
20A 1.250 0.750 0.750 0.375
0.377 1.200 1.188 1 .O25
0.518 0.600 0.006 I .40t
20B
1.250 0.750 0.770 0.401 0.403
1 .O50 1 .O40 1 .O40 0.547 0.547
0.006 I .432
24A 1.500
0.875 1 .O00 0.437 0.439 1.439 1.425
1.230 0.627 0.719 0.007 I .785
24B 1.500 1 .O00 1 .O00
0.576 0.578 1.328 1.315 1.315
0.691 0.691 0.007 1.904
28A 1.750 1.000 1 .O00 0.500 0.502 1.680
1.663 1.435 0.725 0.839
0.008 1.924
28B 1.750 1.100
1.220 0.626 0.628 1.475 1.460
I .460 0.768 0.768
0.008 2.345
32A 2.000 1.125 1.250 0.562
0.564 1.919 1 .go0
1.640 0.828 0.958
0.008 2.305
32B 2.000 1.150 1.220 0.701
0.703 1.682 1.665
1.665 0.874 0.874 0.008 2.305
4ûA
2.500 1.562 1.500 0.781 0.783 2.399
2.375 2.050 1 .O33
1.195 0.008 2.815
40B 2.500
1.550 1.500 0.901 0.903 2.106 2.085
2.085 1 .O93 1 .O93
0.008 2.846
48A 3.000 1.875 1.875
0.937 0.939 2.879 2.850
2.460 1.238 1.433 3.458
0.008
48B 3.000 1 .go0 1.800 1.151
1.153 2.540 2.515 2.515 1.317
1.317 0.008 3.591
56B
3.500 2.125 2.100 1.351 1.353 3.096
3.065 3.065 1.599 1.599
0.008 4.197
64B 4.000 2.400
2.500 1.551 1.553 3.586 3.550
3.550 1.853 1.853
0.008 4.72C
72B 4.500 2.850 2.700
1.751 1.753 4.121 4.080
4.080 2.101 2.101
0.008 5.365
-
* Cranked links are not recommended for use on chains which are intended for onerous applications.
** The actual dimensions will depend on the type of fastener used but they should not exceed the dimensions in this
column, details of which should be obtained by the purchaser from the manufacturer.
NOTE. - Regarding chains 08B and lOB, narrow versions of the simple chain having widths between inner plates
of 5.21 mm (0.205 in) min. (08B) and 6.48 mm (0.255 in) min. (IOB) may be used for motorcycle applications.
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nits) Chain dimensions, measuring loads & breakhg loads of base chains
13 14 15 16 1 17 1 18
11 1 12 19 20 ! 21 1 22
____~
Addit-
Width Width
ional
Trans-
iked link
over between
Width over width
verse
ensions Measuring toad Breaking load
inner outer bearing pins
for joint
pitch
* link plates fastener
**
-
Simple Duplex Triplex Triplex D
...