MIL-DTL-25955A
4.6.11 Resistance to test prod damage test (see 3.6.11). Fifty socket contacts shall be mounted in
inserts either in or out of shells. A test prod in accordance with 4.6.11.1 shall be inserted into the sockets
to depths of 0.125 inches (3.18 mm) and 0.075 (0.191 mm) inches as measured from the face of the
insert. The tolerance on both insertions depths shall be plus or minus 0.005 inches (0.13 mm). It shall be
determined that the shorter insertion makes some contact with the socket spring. The bending moment
specified herein shall be applied to the test prod about its inserted end for each insertion depth. The
socket shall be gradually rotated through 360° at each insertion depth with the bending moment applied
but not rotated. This rotation is in order to apply a uniform force around the inside surface of the socket.
The socket rotation may be accomplished on the socket alone or by rotating the entire insert with the
socket locked in place relative to the insert.
4.6.11.1 Test prod. The insertion tip of test prods for damage test of #20 size sockets shall be as
follows:
a. Hardened steel
b. Engaging tip: Conical with 90° included angle point.
c. O.D.: 0.0390 +0.0005 -0.0001 inches.
4.6.12 Contact separation test (see 3.6.12). Sockets shall be mounted in a suitable position or fixture
for applying gradually increasing loads for the withdrawal (separation) of test pins from the sockets.
Maximum and minimum test pins shall be in accordance with 4.6.12.1. Insertion of test pins shall be
0.125 inch (3.18 mm) minimum from the front of the socket unless normal service depth is otherwise.
Insertion to another depth shall be only with approval of the Government. The sequence of insertions and
measurement (see table III) shall be as follows:
a. Insert and separate a maximum diameter pin in and from 20 sockets. Then insert a minimum
diameter pin in the sockets. Upon separation of the minimum test pin or pins, the separation force
shall be measured and shall comply with the minimum individual forces with minimum pin specified
herein.
b. Insert and separate a maximum diameter pin in and from 30 sockets 3 times. The separation shall
be assured and the average shall comply with the average maximum forces with maximum pin
specified herein.
c. Following the tests of 4.6.12b above, insert a minimum diameter pin in the same socket. The
separation force during the first separation of the minimum pins shall be measured and the
average shall comply with the average minimum forces with minimum pin specified herein.
4.6.12.1 Test pins. The insertion tip of test pins for contact separation tests of #20 size sockets shall
be as follows:
a.
Hardened steel.
Engaging tip: Conical with 90° included angle point.
b.
c.
Finish: 10 rms micro-inches surface roughness maximum.
0.D.: Maximum pin - 0.041 ±0.0001.
d.
0.D.: Minimum pin - 0.039 ±0.0001.
e.
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