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Description / Abstract:
(Footnote *)
This specification covers a quality of round and shaped plain carbon
and alloy steel spring wire,
uniform in quality and temper, intended for the manufacture of
mechanical springs that can
withstand moderate fatigue stresses over some relatively low number of
cycles. The quality level is
between the commercial quality grades of wire such as Specifications A
401/A 401M, A 231/A 231M,
and A 229/A 229M and the valve spring quality grades such
Specifications as A 230/A 230M, A 232/A
232M, A 877/A 877M and A 878/A 878M. It is similar to the grade TD
(referenced in EN 10270-2)
intended for medium fatigue levels, such as required for clutch
springs. This wire shall be either
in the annealed and cold-drawn or oil-tempered condition as specified
by purchaser.
The values stated in either SI units or inch-pound units are to be
regarded separately as standard.
Within the text, the inch-pound units are shown in parentheses. The
values stated in each system
are not exact equivalents; therefore, each system must be used
independent of the other.