Chains of the type covered by this Standard were introduced in the
United States late in the 19th
Century. As their popularity increased, the number of chains and
manufacturers grew. As one
manufacturer developed a successful size chain, or family of chains,
others soon duplicated it and
a large number of chains came into being.
In spite of efforts at standardization, the Corps of Engineers, United
States Army, found during
the Korean incident of 1950-53 that lack of adequate standardization
of power transmission chains
still resulted in the incapacitation of many cranes and shovels. For
this reason, the Corps of
Engineers requested the Society of Automotive Engineers to expand the
scope of ASA Sectional
Committee B29 to cover this group of chains. On May 13, 1956, the
Corps of Engineers request was
approved by the ASA B29 Committee and the ASA B29.10 Subcommittee was
formed. Upon approval by the
American Standards Association in April 1962, the first standard for
ASA B29.10 chains and
sprockets was published. The Standard described the physical
dimensions of the chain components and
sprockets, and defined the minimum static properties for the chains.
In 1970, this Standard was revised to include Drive Selection
information in a Supplementary
Section and to convert fractions to decimal-inch, and include metric
dimensions in SI Units.
In September 1962, the Engineering Steel Chain Division of the ACA
began a research program to
develop ratings for the ANSI B29.10 chains. Capacity information on
the smaller B29.1 chains
already developed in research programs sponsored by the Roller Chain
Division of the ACA was made
available to the Engineering Steel Chain Division. Member companies
contributed information from
their own research programs. Special dynamic test equipment was built
to enable obtaining wear and
capacity data on very large chains. The horsepower capacities
published as supplementary
information in this Standard resulted from this combined research
effort; they are considerably
higher than previously accepted by the industry. At all speeds and for
all sprocket sizes, the
capabilities of ANSI B29.10 chain drives exceeded those previously
accepted by the industry.
This Standard was approved as an American National Standard on
December 27, 1972.
The 1981 revision included updating to the current ANSI standards
format covering chains and
sprockets. In the process of updating, the supplemental information
(Appendices A and B) was
reviewed and found to be inadequate with respect to selection
information. The information was
incomplete and could result in an unsatisfactory selection. Chain
standards generally contained
only dimensional and strength information to allow chains to be
intercoupled. Therefore, the
horsepower capacity information was deleted.
The American National Standards Institute approved that revision on
April 3, 1981.
The 1991 revision added definitions for minimum ultimate strength
(para. 2.2), measuring load
(para. 2.3), and strand length tolerance (para. 2.4). M.U.T.S. values
for chains 4020, 4824, and
5628 were increased. Other clarifications were made without changing
the basic content.
The 1994 revision was approved by the American National Standards
Institute on November 17, 1994.
This 1997 revision of ASME B29.10M was approved by the American
National Standards Institute on
July 22, 1997.