MIL-DTL-55116D
3.2 Qualification. Connectors furnished under this specification shall be products that are authorized
by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.5
and 6.3).
3.3 Materials. The material for each part shall be as specified herein. However, when a definite
material is not specified, a material shall be used which will enable the connector to meet the
performance requirements of this specification.
3.3.1 Plastics.
3.3.1.1 Inserts. Insert material shall be in accordance with ASTM D5948, diallylphthalate resin type
SDG-F or GDI-30F, or MDG.
3.3.1.2 Loading sleeve. Material shall be nylon 6/6, white or natural, in accordance with specification
L-P-410.
3.3.2 Rubber. Rubber material shall be in accordance with ASTM D2000. Composition and hardness
shall be such that the fabricated parts, when assembled with other parts into a finished connector, will
meet the requirements of this specification.
3.3.3 Metals. Metals used to fabricate connectors covered by this specification may be aluminum,
aluminum alloy, brass, steel, or corrosion resistant steel. Where dissimilar metals are used in intimate
contact with each other, protection against electrolysis and corrosion shall be provided. Dissimilar metals
shall be in accordance with MIL-STD-889. Dissimilar metals such as brass, copper or steel, except
corrosion-resisting steel passivated in accordance with SAE AMS2700, shall not be used in intimate
contact with aluminum or aluminum alloy.
3.3.3.1 Contacts. All contacts shall be brass, UNS no. C36000, temper H02, in accordance with
ASTM B16/B16M. Finish shall be gold plate in accordance with ASTM B488, type I, code C, class 0.75
(.000030) over nickel in accordance with SAE AMS-QQ-N-290, minimum thickness .0001 inch. Copper
underplate is optional before nickel. If used, copper underplate must be .0002 inch minimum. Contacts
are to be washed in hot water only to remove salts. Do not burnish, tumble, or coat in any manner that
may interfere with cements used for bonding contact into plastic.
Spring elements of the spring loaded contacts shall be beryllium copper, C17200 and C17300,
temper TH04, in accordance with ASTM B197/B197M, ASTM B196/B196M, or ASTM B194. The finish
shall be silver plate, M351, in accordance with MIL-DTL-14072 or gold plate over silver in accordance
with ASTM B488, type I, code C, class 0.75 (.000030).
3.3.3.2 Connector shell. The connector shell may be fabricated entirely of stainless steel or with a
stainless steel liner covered with plastic. The stainless steel shall be in accordance with SAE AMS 5639,
or type 304 condition B, hardened in accordance with SAE AMS-QQ-S-763, or type 303 condition A, cold
rolled annealed in accordance with ASTM A582. The plastic covering shall be black, glass filled nylon 6,
6/10 or 6/12 type in accordance with ASTM D6779.
3.3.3.2.1 Connector locking pins. The three connector locking pins required in female type connectors
shall be hardened stainless steel, type 304, condition B in accordance with SAE AMS-QQ-S-763, or heat
treated stainless steel, type 416, condition H, in accordance with ASTM A582/A852. The pins shall each
have a diameter of 0.044 ± .001 inch on the exposed surface. The base circle diameter of the 3 pins shall
be .557 ± .002 inch.
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