Chains of the type covered by this Standard were introduced early in
the 20th century. The chains
met with considerable success on material conveyors and elevators, and
manufacturers developed and
marketed many sizes and types in the next several years.
The American Sprocket Chain Manufacturers Association (now the
American Chain Association)
recognized the need for standards which would provide for
interchangeability by intercoupling
chains of various manufacture. In November 1960, a working group of
producers of the bushed
rollerless chains was formed to accomplish standardization. This
Standard is the result of the work
of that group.
This Standard was presented to the USA (now ANSI) Standards Committee
B29 on December 12, 1967,
and, upon approval by the USA Standards Institute (now American
National Standards Institute,
Inc.), on October 18, 1968, was adopted and published. The 1974
revision included minor changes in
metric units and the addition of caution notes to Table 1.
To facilitate the use of this Standard in the international market,
the metric equivalents of all
dimensions are given.
The current revision includes the addition of chain numbers S-856,
S-857, S-859, and S-864 and
attachments K-24, K-3, K-35, K-44, and K-443 for these chains. Also
added is minimum bolt hole
diameter required for the bolt diameter for a particular attachment.
The Minimum Ultimate Tensile
Strength definition (para. 2.1) has also been modified.
This revision was approved by the American National Standards
Institute, Inc., on March 25, 1997.
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