MIL-DTL-85052B
4.4.4 Clamp assembly tests.
4.4.4.1 Diametral retention test. Unless otherwise specified, six clamps of each size -4,
-6, -8, -10, -12, -16, -20, -24 shall be subjected to this test, both before and after the vibration
test (see 4.4.4.2.1). The test clamp shall be installed on a clean, dry mandrel conforming to
4.4.1.2 (a shorter length may be used). Mount the clamp with a 10-32 UNF-3A bolt, free
running nut, and a .0625 + .0005 inch thick spacer between the clamp feet. Tighten the bolt to
a 30 lb-in torque. The mandrel shall be slowly forced to slide longitudinally through the clamp
as shown on figure 3. The cushion shall not roll or slip off the band. The force to move the
mandrel one inch shall be recorded. The clamps shall meet the requirements specified in
3.5.3.1.
FIGURE 3. Clamp set up for diametral retention test.
4.4.4.2 Vibration and transmissibility test.
4.4.4.2.1 Vibration test. Three clamps of each size of -4, -6, -8, -10, -12, -16, -20, -24
shall be tested. Mount the clamps on a mandrel conforming to 4.4.1.2 with spacing and
dimensions as specified in table IV, and as shown on figure 1. The assembly shall be installed
on a vibration fixture and vibration table as shown on figure 1. Clamps shall be mounted flat
on the vibration fixture with 10-32 UNF-3A bolts (160 KSI or higher strength). A flat washer
shall be used beneath the head of the mounting bolt with smooth edge against the clamp foot.
An input measuring accelerometer shall be mounted on the vibration fixture adjacent to but not
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