Transmission Roller Chains Transmission Roller Chain Machinery's Handbook, 31st Edition
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Standard Roller Chain Nomenclature, Dimensions and Loads.— Standard nomencla ture for roller chain parts are given in Table 1. Dimensions for Standard Series and Heavy Series roller chain are given in Table 2. Table 2. Roller Chain Dimensions ANSI/ASME B29.1-2011 (R2016)
D p
LPT
D r
LPT
W
P
P
Max. Roller Diameter D r
Pitch P
Standard Series
Heavy Series Thickness of Link Plates LPT
Standard Chain No.
Pin Diameter D p
Thickness of Link Plates LPT
Measuring Load, a lb
Width W 0.125 0.188 0.312 0.250 0.375 0.500 0.625 0.750 1.000 1.000 1.250 1.406 1.500 1.875
b 0.130 b 0.200
25 35 40 41 50 60 80
0.0905 0.030 0.141 0.050 0.156 0.060 0.141 0.050 0.200 0.080 0.234 0.094 0.312 0.125 0.375 0.158 0.437 0.187 0.500 0.219 0.562 0.250 0.687 0.281 0.781 0.312 0.937 0.375
18 18 31 18 49 70
… … … … …
0.250 0.375
0.500 0.312 0.500 0.306 0.625 0.400 0.750 0.469 1.000 0.625 1.250 0.750 1.500 0.875 1.750 1.000 2.000 1.125 2.250 1.406 2.500 1.562 3.000 1.875
0.125 0.156 0.187 0.219 0.250 0.281 0.312 0.375 0.500
125 195 281 383 500 633 781
100 120 140 160 180 200 240
1000
a For single-strand chain. b Bushing diameter. This size chain has no rollers. All dimensions are in inches. Roller Diameters D r are approximately 5 ⁄ 8 P . The width W is defined as the distance between the link plates. It is approximately 5 ⁄
8 of the chain
pitch. Pin Diameters Dp are approximately 5 ⁄
16 P or 1 ⁄ 2 of the roller diameter. Thickness LPT of Inside and Outside Link Plates for the Standard Series is approximately 1 ⁄ 8 P . Thickness of Link Plates for the Heavy Series of any pitch is approximately that of the next larger pitch Standard Series chain.
Maximum Height of Roller Link Plates = 0.95 P . Maximum Height of Pin Link Plates = 0.82 P . Maximum Pin Diameter = nominal pin diameter + 0.0005 inch. Minimum Hole in Bushing = nominal pin diameter + 0.0015 inch.
Maximum Width of Roller Link = nominal width of chain + (2.12 × nominal link plate thickness.) Minimum Distance between Pin Link Plates = maximum width of roller link + 0.002 inch.
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