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|  MIL-S-45387B(AT)
(m) Magnetic inspections:
(1) Magnetize spring between terminal posts and apply indicating solution while
magnetizing current is flowing.
(2) Demagnetize.
(3) Electric etch or stamp letter "M" on outer end of acceptable springs.
(n) Shot peen.
NOTE: Step "r" may be performed simultaneously with stem "n" if splines have been made in step
"i".
(o) Pre-set (see 3.5.6).
(p) Machine one serration from each end as per drawing; machined area shall then be
peened as specified in 3.5.5.
(q) Mark, in a permanent manner, indexing notch on trailing end.
(r) Shot peen serrations (see step "n").
(s) When necessary, demagnetize to remove any residual magnetism remaining from
pre-setting or shot peening.
(t) Clean (see 3.6.1).
(u) Prime (3.6.1).
(v) Tape (see 3.6.3).
*
6.2.1 Recommended means of assessment of effectiveness of shot peening. Surface residual
stress measurements have proven to be an excellent means of determining the effectiveness of shot
peening intensity and coverage. It has been found that average compressive residual stress for a
correctly processed steel bar will be in the range of 45,000 to 60,000 psi and the standard deviation
(one sigma) of the reading will be less than or equal to 8,000 psi. A minimum of two hundred (200)
readings are generally taken utilizing an automated residual stress instrument. Readings are taken
randomly from one (1) by one (1) inch square grids that have been superimposed longitudinally and
radially on the spring surface.
*
6.3 Changes from previous issue. The margins of this specification are marked with an
asterisk to indicate where changes (additions, modifications, corrections, deletions) from the previous
issue were made. This was done as a convenience only and the Government assumes no liability
whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate
the requirements of this document based on the entire content irrespective of the marginal notations
and relationship to the last previous issue.
Custodian:
Preparing activity:
Army AT
Army AT
Project No. 2530-A254
10
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