MIL-DTL-6193D
3.4.2 Assembly. The joints shall be assembled with pins and bearings pinned or locked into place to
prevent disassembly of the finished joint.
3.4.3 Hardness. The hub sections of joints (defined by area bounded by dimension H in MS20270
and MS20271) shall not exceed Rockwell hardness C-40.
3.4.4 Finish.
3.4.4.1 Steel parts.(excluding CRES). All external steel parts of joints shall be cadmium plated in
accordance with SAE-AMS-QQ-P-416, type II, class 2 or zinc plated in accordance with ASTM-B633 (see
1.2.1).
3.4.4.2 Verification of plating thickness. Verification of plating thickness shall be in accordance with
ASTM B659.
3.4.5 Lubrication retaining covers (class 2). Lubrication retaining covers shall be made so they that
exclude dirt and dust from the bearing surfaces and shall retain the lubricant on those surfaces at all
temperatures between -55°C and +71°C during operation.
3.4.5.1 Ozone resistance. The lubrication retaining cover when tested in accordance with 4.7.9 shall
not exhibit any evidence of cracking.
3.4.5.2 Hazardous substances and ozone depleting chemicals. The ozone resistance test (see
4.7.9) may contain hazardous chemicals. It shall be handled in accordance with Federal regulations and
guidelines to perform those tests. For further information about toxic chemicals and hazardous materials
list, consult the Environmental Protection Agency web database at
3.4.5.3 Without lubrication retaining covers. Class 1 universal without lubrication retaining covers
joints shall be lubricated with oil conforming to MIL-PRF-7870.
3.4.5.4 With lubrication retaining covers. Class 2 joints with lubrication retaining covers shall be
lubricated with a lubricant consisting of a uniform mixture of grease conforming to MIL-PRF-32014 or
MIL-PRF-81322 with a 6 ± 0.5% by weight additive of molybdenum disulfide lubricant conforming to
SAE-AMS-M-7866.
3.5 Performance.
3.5.1 Angularity. The joints shall be such a design and construction as to be operable at an angle of
not less than 30° when measured between the axes of the hubs.
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