MIL-DTL-1222J
heated to a temperature high enough to change their strength or
microstructure, and no other dimensions are altered.
4.5.2.3 Wedge tensile testing of bolts and screws. Wedge tensile tests
on headed fasteners shall be done in accordance with ASTM F 606. Bolts and
screws that require a calculated test load greater than 150,000 pounds shall
be tested on a machine with a test load limit of 150,000 pounds or greater
and shall not fail at a load less than the calculated test load or the limit
of the test machine, whichever is lesser. Fasteners may be tested with wedge
angles greater than those specified. Because their head configuration will
not permit wedge tensile testing, socket flat countersunk cap screws are
exempt from wedge tensile testing.
4.5.2.3.1 Wedge angles for socket head cap screws. Wedge angles for
socket head cap screws, other than titanium, shall be in accordance with ASTM
A 574. Wedge angles for titanium socket head cap screws shall be 6° for
fasteners under ½ inch in diameter and 4° for fasteners ½ inch or larger in
diameter. Fasteners may be tested with wedge angles greater than those
specified.
4.5.2.4 Proof load and axial tensile tests for bolts, screws and studs.
Full sized axially tensile tests shall be done in accordance with ASTM F 606.
Proof load tests on bolts, screws, and studs shall be done using method 1 in
accordance with ASTM F 606. Full sized yield strength tests shall be done
using method 2 or 2A in accordance with ASTM F 606. Studs selected in
accordance with 4.2.2 shall be axial tensile tested in accordance with ASTM
F 606. Full sized axial tensile tests on fully threaded rod that is too long
shall be done on a cut specimen. Fasteners that can not be tested full size
shall be tested using test specimens machined from the fastener in accordance
with ASTM F 606.
4.5.2.5 Proof load test for nuts. Proof load tests on nuts shall be
performed in accordance with ASTM F 606.
4.5.2.5.1 Nuts with required proof loads over 120,000 pounds. Hardness
tests may not be substituted for proof tests on nuts that require a proof
load of over 120,000 pounds.
4.5.2.6 Hardness. Hardness tests shall be performed in accordance with
ASTM F 606. All copper, aluminum titanium, and grade 400 fasteners and
grades 304, 305, 316, 321, 347, and 384 cold worked bolts,cold worked screws,
cold worked studs, and socket head cap screws do not require hardness
testing. Externally-threaded fasteners with hardness values below the
minimum requirement may be accepted provided they pass all of the other
required tests. Nuts with hardness values below the minimum requirement may
be accepted provided they pass all of the other required tests. Hardness
conversion of steels in accordance with ASTM E 140 is permitted.
4.5.2.7 Alternate mechanical testing. Mechanical test results on the
rod, bar, or wire used to produce the fasteners, may be substituted for proof
stress, yield strength and axial tensile tests of externally-threaded
fasteners provided all of the following conditions and tests are met:
a) The tests were done on the same lot of rod, bar or wire used
to produce the fasteners.
b) The fasteners were fabricated solely by machining without
further heat treatment or cold work.
c) When quenched and tempered or solution annealed and aged rod,
bar or wire is used to produce studs, bolts or screws ½ inch
in diameter or less, its nominal diameter may be no more than
four times the nominal diameter of the stud, bolt or screw.
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