MIL-DTL-85052B
Tensile and elongation cushion material test specimens may be cut from larger size clamp
cushions of the same inspection lot and shall be provided by the manufacturer.
4.3.3 Clamp band hardness test. Samples from each heat treated lot of clamp bands
(see 4.3.2) shall be tested in accordance with the Rockwell superficial hardness specified in
ASTM-E18. The clamp bands shall meet the requirements specified herein (see 3.5.2.1).
4.4 Test methods.
4.4.1 Test conditions.
4.4.1.1 Environment. Unless otherwise specified, all tests shall be performed at room
temperature (60 - 90 °F).
4.4.1.2 Test mandrels. Unless otherwise specified, all test mandrels shall be tool steel
drill rod in accordance with ASTM-A582. Unless otherwise specified, all dimensions shall be as
specified in table IV with surface texture of 32 micro inches maximum. Spacing A and B shall
be as shown on figure 1.
4.4.2 Examination of product (qualification inspection). Clamps shall be carefully
examined to determine compliance with the requirements of this specification and applicable
specification sheet with respect to material, workmanship, configuration, marking, and
dimensions as specified in 3.4. Any variation beyond the dimensions, plus allowable tolerances,
shall be classified as major or minor as specified in table III.
4.4.2.1 Examination of product (conformance inspection). For conformance inspection,
examination of product shall consist of examining factors outlined in tables II and III.
4.4.3 Clamp cushion tests.
4.4.3.1 Physical properties tests. Tests shall be conducted in accordance with the test
methods shown in table II of the applicable specification sheet. Cushion material samples shall
meet specified requirements (see 3.5.1.1).
4.4.3.2 Compression set test. Three cushion material test samples shall be air aged at the
temperature specified on the applicable specification sheet for 70 hours and tested in accordance
with ASTM-D395, Method B. Cushion material samples shall meet the requirements specified
in the applicable specification sheet (see 3.5.1.2).
4.4.3.3 Flammability test. The flammability tests shall be performed as specified below.
The flame source shall be a Bunsen Burner or similar burner having a nominal tube internal
diameter of 0.375 inch. The burner shall be adjusted to provide a 1.5 inches high flame of blue
o
intensity (see figure 2). Verify flame temperature to be a minimum of 1550 F, at the center of
the flame, with the use of a thermocouple. The clamp assembly shall meet the requirements
specified in the applicable specification sheet (see 3.5.1.3).
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