MIL-DTL-1222J
and a random sample of fasteners selected in accordance with 4.2.2.are
examined in accordance with SAE J123 or ASTM F 788 for defects within one
diameter of the cut.
4.3.2.1 Nondestructive inspection. Fasteners selected for inspection
in accordance with SAE J122, SAE J123, ASTM F 788, ASTM F 812, or ASTM A 574
shall be inspected by wet magnetic particle or liquid penetrant methods in
accordance with NAVSEA T9074-AS-GIB-010/271. Nuts made from grade 400, 405,
and 500 materials do not require liquid penetrant inspection unless required
by 4.3.3. Unless otherwise specified, acceptance criteria shall be as
required in SAE J122, SAE J123, ASTM F 788, ASTM F 812, or ASTM A 574
(see 6.2 and 6.3).
4.3.2.2 Determination of defect depth. Defects in fasteners that
require measurement to determine acceptability shall be measured by one of
the following methods: (a) macroscopic examination at not less than 25X, (b)
micrometer measurement before and after defect removal or (c) microscopic
examination of sections cut through the defects. A minimum of ten percent of
the fasteners with seams shall be tested for depth determination.
4.3.3 Additional nondestructive testing of fasteners. When specified
(see 6.2), fasteners shall be inspected by wet magnetic particle or liquid
penetrant methods in accordance with NAVSEA T9074-AS-GIB-010/271 (see 6.2 and
6.3). Acceptance criteria and sampling shall be as specified (see 6.2).
When required, this inspection is to be done in addition to the inspections
required by 4.3.2.
4.4 Dimensional. Table XIV specifies the features to be dimensionally
inspected (see 6.2 and 6.3). Acceptability of UN and UNR screw threads shall
be determined based upon system 22S, ASME B1.3M, with the addition of control
on the roundness of the pitch cylinder. Screw thread gages and gaging shall
be in accordance with ASME B1.2 and capable of inspecting any out-of-round
condition that affects fastener assembly and function.
4.5 Test methods.
4.5.1 Chemical analysis. Chemical analysis shall be performed as
specified in the applicable commercial specification listed in table I.
(see 6.2 and 6.3).
4.5.2 Mechanical property tests. The tests marked as required in
table XIII shall be performed on full sized fasteners using sampling per
4.2.2. The mechanical tests performed shall meet the requirements of
table II, table III, and table IV (see 6.2 and 6.3). Unless otherwise
specified, all mechanical tests shall be done after the final heat treatment
(see 6.2). Unless otherwise specified, retesting is not allowed (see 6.2 and
6.6). Axial tensile strength, wedge tensile, and proof load tests are
considered to be destructive tests. Subsequent to destructive testing,
sample fasteners shall not be reworked nor offered for acceptance.
4.5.2.1 Testing of short externally-threaded fasteners. Production
fasteners that have insufficient overall length or thread length to be tested
in accordance with ASTM F 606 shall be evaluated using test fasteners that
are at the minimum length requiring testing or up to ¼ inch longer. The test
fasteners shall be made from the same heat of rod, bar, or wire as the
production fasteners; have the same type, style, and diameter as the
production fasteners; and shall be processed and heat treated with the
production fasteners.
4.5.2.2 Testing of fasteners with reduced length. Fasteners that have
passed all of the mechanical property tests of this specification may be
reduced in length without repeating the mechanical property tests provided
traceability to original lot and testing is maintained, the fasteners are not
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