MIL-DTL-16356E
4.7.6 Class IV gauge spring cone washer tests.
4.7.6.1 Compression testing. Complete capscrew (bolt) assemblies with assembled spring cone washers in
accordance with 02131 shall be compressed on a tensile test machine or equivalent rigid test frame with hydraulic
actuator. Results must be adjusted to eliminate deflection of the test frame or machine compliance of the tensile
machine. The bolt specimen shall be supported in a hollow coupling so as to permit compression of the washers
without interference from the capscrew portion extending below the washers. A curve of compression load (in
pounds) versus deflection of the washer stack over the range of 0 to 0.040 inch deflection shall be generated. The
stiffness (slope of curve) in the linear region between 0.010 and 0.020 inches of deflection shall be between 110,000
and 225,000 pounds per inch. Variation between samples tested should not exceed 25,000 pounds per inch.
4.7.6.2 Hardness testing of spring cone washers. Rockwell hardness testing shall be conducted on spring cone
washers. A random sample of washers shall be selected from each lot for examination of visual and dimensional
characteristics in accordance with ASQ H1331 at Inspection Level III. Testing shall be done at two locations
180 degrees apart on the internal conical surface, midway between the hole and outer edge. Hardness shall be in
accordance with standard value established during first article test heat treatment testing.
4.7.7 Type A glass sets.
4.7.7.1 First article inspection. The first article sample shall be subjected to the first article inspection shown in
table X.
TABLE X. First article and conformance inspection.
Examination and Test
Requirement
Test
First Article
Conformance
General examination
X
X
Visual and dimensional examination
X
X
Thermal shock
X
X
Fracture
X
Simulative service
3.12.3.3 and
X
X
Bend test 1/
X
Polarscopic examination 1/
X
Mica quality
Spring cone washer heat treatment
X
Capscrew spring cone compression
X
Spring cone washer hardness
X
Valve stem hardness
X
X
NOTE:
1/
are not accomplished.
4.7.7.2 Glass set lot. For purposes of sampling, a lot shall consist of all glass sets of one size and type
produced in one plant under the same conditions and offered for delivery at one time. A lot shall not exceed
1000 sets.
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