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MIL-DTL-83538 Connectors And Accessories, Electrical, Circular, Umbilical, Environment Resistant, Removable Crimp Contacts For Mil-Std-1760 Applications \(Metric\), General Specification ForThis specification covers connectors and accessories, electrical, circular, umbilical. The connector assembly provides the necessary connections required to meet MIL-STD-1760, class I electrical interface between stores and their associated launchers using a "blind mating" mechanism. The connector assembly consists of a receptacle installed on the launcher, a receptacle installed on the store, and a buffer plug installed between the two receptacles. This specification also includes the required mounting adapters and nut, accessory adapter, cable bushing, and protective covers \(see 6.1 for details on intended use and application\). The connectors covered by this specification are intended for use with launcher mechanisms with an applied holding force in the range 271 Newtons \(61 lbs\) to 427 Newton \(96 lbs\).

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MIL-DTL-83538D
3.4.9 Plating.
3.4.9.1 Contacts for buffer plug unit. Contacts shall be gold-plated to a minimum thickness of
0.00127 mm (.000050 inch) in accordance with ASTM B488 over a suitable underplate. Silver underplate
shall not be used.
3.4.9.1.1 Crimp contacts. The plating and plating thickness on crimp contacts shall be as specified in
SAE-AS39029.
3.4.9.2 Shell spring fingers. Shell spring fingers shall be suitably protected to prevent corrosion.
3.4.9.3 Shell components ­ launcher receptacle ­ store receptacle ­ buffer plug. Shell components
shall be nickel plated (electrodeposited nickel) in accordance with SAE-AMS-QQ-N-290.
3.5 Interchangeability. All major components (launcher receptacle, store receptacle, buffer plug unit,
accessories and contacts) of the connector assembly having the same PIN shall be completely
interchangeable with each other with respect to installation and performance.
3.6 Maintenance aging. When tested as specified in 4.6.2, the contact installing and removal forces
shall not exceed the requirements in table II.
3.7 Temperature cycling. When tested as specified in 4.6.3, there shall be no blistering, peeling, or
separation of plating or other damage detrimental to the operation of the connector. The test
temperatures shall be -65°C minimum to +175°C maximum.
3.8 Coupling.
3.8.1 Coupling torque of bayonet coupled components. When tested as specified in 4.6.4.1, the
coupling torque for mating and unmating of the launcher receptacle from the buffer plug and protective
covers from launcher receptacle shall be 4.1 Newton-meters (3 ft-lb) maximum and shall be not less than
0.6 Newton-meters (.5 ft-lb) for unmating. The torque for mating and unmating the protective cover from
the store receptacle shall be 1.5 Newton-meters (1.2 ft-lb) maximum and shall be not less than
0.3 Newton-meters (.25 ft-lb) for unmating.
TABLE II. Installing and removal forces.
Installing and removal forces (maximum)
Contact
size
Newtons
Pounds
20
89
20
16
89
20
12
133
30
8 Triaxial
156
35
3.8.2 Coupling force. When tested as specified in 4.6.4.2, the coupling force required for mating the
combined launcher receptacle/buffer plug assembly from the store receptacle shall not exceed 271
Newtons (61 pounds).
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