MIL-DTL-1222J
studs, and the top face of nuts. Studs with the same thread configuration on
both ends may be marked on either end.
3.13.3 Marking after final heat treatment. Markings applied after the
final heat treatment shall be applied in accordance with method I, II III, V,
VIII or IX of MIL-STD-792, except grades 410, 416 and 431 in the H condition
and grades 8, 630, A574, and 4340 shall be marked by method II.
3.14 Part identification. The part identification number (PIN) format
is shown in appendix A and shall be used to obtain new National Stock Numbers
(NSN's) as needed unless existing PIN formats (for example, from NAVSEA or
shipbuilder drawings) can be used. The PIN shall also be marked on the
packages for all fasteners meeting the requirements of this specifications.
3.15 Workmanship. Fasteners shall be uniform in quality and condition,
and shall be free from rust, scale, seams, bursts, voids, nicks, gouges and
burrs, to the extent required by the applicable inspection standards (see
4.3.2.1).
4 VERIFICATION
4.1 Conformance inspections. Conformance inspection shall include the
examinations of 4.3 and the tests of 4.4.
4.2 Sampling.
4.2.1 Lot definition. A lot of fasteners shall consist of fasteners
made from one heat of material that are of the same type, style, nominal
size, thread series and have the same coating. All fasteners in a lot must
be fabricated and heat treated in the same batch or by a continuous process
under the same conditions as to time and temperature, and offered for
inspection at one time. Fasteners of differing length that meet the above
definition are permitted to be grouped into one lot.
4.2.2 Sampling for conformance inspection. Sampling shall be as shown
in table XI. Fasteners selected for examination or testing shall be randomly
selected from the lot shipped, in the quanitites identified in table XII.
4.3 Examinations.
4.3.1 Visual. Fasteners shall be visually inspected for correct
configuration (see 1.2.1), presence of a self-locking element (see 3.11),
presence of a coating (see 3.6), identification marking (see 3.13), and
workmanship to 3.15 (see 6.2 and 6.3). Fasteners may be examined during
production as part of a statistical process control program as long as the
property measured is not changed by any subsequent operation. Wrong
configuration, missing or unordered coatings, and improper workmanship or
marking shall be cause for rejection of the lot. Unless otherwise specified,
lots failing the visual examination may not be resubmitted for acceptance
(see 6.2 and 6.7).
4.3.2 Inspection for defects. Nuts shall be inspected in accordance
with SAE J122 or ASTM F 812 and bolts, screws and studs shall be inspected in
accordance with SAE J123 or ASTM F 788, including supplementary requirement
S1, unless an alternate method is specified (see 6.2 and 6.3). Head and
socket discontinuities on cylindrical socket head cap screws shall be
evaluated in accordance with ASTM A 574. Bolts, screws and studs, that have
previously passed this inspection for defects, and are subsequently altered
by reducing their length do need not be re-inspected for defects provided
traceability to the original inspection results is maintained, no other
dimensions are altered, the fastener has not been coated, the fastener is not
heated to a temperature high enough to change its strength or microstructure,
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