Roller Chain Dimensions Table

Roller Chain is a series of alternately assembled roller links and pin links in which the pins articulate inside the bushings and the rollers are free to turn on the bushings.

  • The roller diameter (Dr) is approximately 5/8 x pitch (P).
  • The chain width (W) is the distance between roller link plates and approximately 5/8 x P.
  • The pin diameter (Dp) is approximately 5/16 x P or 1/2 of Dr.
  • The maximum height of roller link plates and pin link plates are is 0.95 x P and 0.82 x P respectively.
roller chain dimensions

General Chain Dimensions, in.

Std.
Chain
No.		 Chain
Pitch
P		 Max.
Roller
Dia.
Dr		 Nom.
Chain
Width,
W
 Nom.
Pin
Dia.
Dp		 Link Plate
Thickness
LPT		 Length
Tolerance
in/ft		 Measuring
Load,
lb		 M.U.T.S,
lb		 Min.
Dynamic
Strength,
Std. Series,
lb		 Min.
Dynamic
Strength,
Heavy Series,
lb
Std.
Series		 Heavy
Series
25 0.250 0.130 0.125 0.0905 0.030 ... 0.031 18 780 140 ...
35 0.375 0.200 0.188 0.141 0.050 ... 0.022 18 1760 320 ...
41 0.500 0.306 0.250 0.141 0.050 ... 0.019 18 1500 305 ...
40 0.500 0.312 0.312 0.156 0.060 ... 0.019 31 3125 560 ...
50 0.625 0.400 0.375 0.200 0.080 ... 0.018 49 4880 870 ...
60 0.750 0.469 0.500 0.234 0.094 0.125 0.017 70 7030 1230 1420
80 1.000 0.625 0.625 0.312 0.125 0.156 0.016 125 12500 2150 2400
100 1.250 0.750 0.750 0.375 0.156 0.187 0.016 195 19530 3280 3590
120 1.500 0.875 1.000 0.437 0.187 0.219 0.015 281 28125 4620 5000
140 1.750 1.000 1.000 0.500 0.219 0.250 0.015 383 38280 6140 6560
160 2.000 1.125 1.250 0.562 0.250 0.281 0.015 500 50000 7820 8290
180 2.250 1.406 1.406 0.687 0.281 0.312 0.015 633 63280 9650 10200
200 2.500 1.562 1.500 0.781 0.312 0.375 0.015 781 78125 11600 12700
240 3.000 1.875 1.875 0.937 0.375 0.500 0.015 1000  112500 15800 18300

Notes:

Dr is bushing diameter for chain 25 and chain 35 as these chains have no rollers.

Minimum Ultimate Tensile Strength (M.U.T.S) for a chain is the minimum force at which an unused, undamaged chain could fail when subjected to a single tensile loading test. Standard series single-strand chains will have a minimum ultimate tensile strength equal to or greater than the values listed above. For a multiple-strand chain, the minimum ultimate tensile strength equals that of a single strand multiplied by the number of strand

Measuring load is the load under which the chain is to be measured for length. Values given above are for single strand chain.

Supplements:

Reference:

  • ASME B29.1-2011 - Precision Power Transmission Roller Chains, Attachments, and Sprockets