Chains, Attachments, and Sprockets
for Power Transmission and Conveying
ASME B29.1
B29.1. The original design of precision roller chain dates back to the late 1890s, although various
types of drive chains have been in use for centuries. The early automobiles used roller chain
extensively as the final drive. The industrial use for roller chain grew substantially, resulting in
the desirability of standardization. The perfected American Standard Chain of today has evolved
to meet the demand for ever-increasing horsepower and higher speeds, as well as accurate timing.
In 1913 the Society of Automotive Engineers published formulas for calculating the roller chain
length, sprocket tooth profiles, and other important design criteria. Recommendations from the
Roller Chain Committee of the American Society of Mechanical Engineers followed in 1917 with
dimensional standards for the various components and assemblies. Early in 1920, through the
cooperation of these two groups, roller chain standards were formulated and recommended for
acceptance by industry. The progresswas followed in 1921 by organization of a sprocket committee
of the American Gear Manufacturers Association.
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