MIL-DTL-62567D(AT)
b. Shot was round, cast steel with a hardness of Rockwell C55 through C65. Shot size
on the torsion bar body was optional as required to obtain the specified intensity.
Shot size used in the spline root area was not greater than 170 as defined in
SAE AMS 2430.
c. Minimum coverage was 200 percent. Complete coverage of the spline root area was
required.
d. All bar straightening and removal of surface indications was to be accomplished prior
to peening. In addition, inspection of shot peening results were included in this
document as follows:
1. A minimum of one shot peening test strip was selected per each hour of
processing for shot peening unless an approved SPC plan was used.
2. Results of shot peening were included as group C inspections in table IV. Shot
peen coverage, both before and after preset, was inspected using either a
10X magnifier or dyescan tracer liquid. Shot peen intensity was inspected using a
test strip and by visual observation.
6.6 Protective covering. In order to protect the bar body from scratches and nicks, past
manufacturing techniques have included the use of a tape covering. The body of the bar was
covered with tape conforming to type EF (9 mm thick) of A-A-59770 in the area shown on
Drawing 12292010. Tape was spirally wound with 50 percent overlap. Free ends had an
additional winding to prevent peelback.
6.7 Definitions.
6.7.1 Torsion bar. The torsion bar is a round steel bar that acts as a torsional spring for
the road arms of an armored, tracked vehicle.
6.8 Subject term (key word) listing.
Bar stock
Billet
Heat treatment
Involute tapered tooth
Macroetch
Master plug
Ring gage
Shot peen
Spline gage
Ultrasonic inspection
6.9 Changes from previous issue. Marginal notations are not used in this revision to
identify changes with respect to the previous issue due to the extensiveness of the changes.
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