MIL-PRF-63460E
4.2.6 Falex load carrying capacity.
4.2.6.1 Falex pin & vee block preparation. Use Standard Coined Vee Blocks of AISI 1137
steel, and Standard No. 8 Test Pins of AISI 3135 steel, in accordance with ASTM D5620.
Thoroughly clean the blocks and pins in accordance with Annex A, of ASTM D5620, except that
vee blocks and pins shall not be sand blasted or phosphated.
4.2.6.2 Falex load carrying capacity. Test Pins and Vee Blocks shall be prepared and
inserted in the machine. The load carrying capacity is then determined in accordance with ASTM
D5620, Procedure B. This test shall be performed three times, using a new set of test pin and vee
blocks each time and allowing the Falex machine jaws and chuck to cool to room temperature of
20 ± 2 °C (68 ± 4 °F) prior to each run.
4.2.6.3 Falex failure criteria. The load carrying capacity of the lubricant is the load of the
step below which failure of the lubricant film occurs. The failure point is indicated by any of the
following: 1) breaking of the shear pin or test pin, 2) a rapid rise in torque (10 in./lb or more
above the running torque), or 3) failure to maintain a constant load on the test pieces due to rapid
wear of the metal. Failure to successfully sustain the 500 pound load on any of the three test
iterations shall be cause for failure of product qualification.
4.3 Interface verifications.
4.3.1 Corrosion production. Test Coupons measuring 25 by 51 by 6.4 mm made from metals
as specified in TABLE V shall be used for the corrosion test.
TABLE V. Metal coupons for corrosion production tests.
Metal
Specification
Metal
Specification
Zinc
MIL-A-18001
Copper
ASTM B152/B152M
Aluminum
ASTM B209
Magnesium
AMS 4376
Brass
ASTM B16/B16M
Cadmium
A-A-51126
Steel
ASTM A109/A109M
4.3.1.1 Preparation of test coupons. Polish all surfaces of the Test Coupons using
progressively finer abrasive paper. The final polishing shall be done using a slow speed
horizontal metallurgical polishing wheel with 240-grit aluminum oxide paper or cloth moistened
with Type II dry cleaning solvent conforming to MIL-PRF-680. Test Coupons shall then be
cleaned by swabbing in hot naphtha with a final rinse in warm anhydrous methanol conforming
to Grade A of O-M-232 (use 95 % ethanol for the magnesium specimen). The Test Coupons
shall be held in a manner to avoid contact with the operator's hands.
4.3.1.2 Exposure of test coupons. After weighing, place the Test Coupons, in order listed
above, in a jar measuring approximately 90 mm in diameter and 95 mm deep and having a screw
cap. Stand the Test Coupons on one 6.4 mm edge in a circular pattern so that the 25mm length is
parallel to the jar circumference as indicated in Figure 1. Position the coupons along the jar
circumference so that there is an approximately equal spacing between each. The test coupons
shall be covered with enough of the product supplied, containing no solid particles, so that the
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