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

3.14 Salt spray corrosion. When tested as specified in 4.6.10, unmated connectors shall show no

exposure of basis material due to corrosion which will adversely affect performance.

3.15 Electrical engagement. When tested as specified in 4.6.11, wired, mated connectors shall

provide a minimum of 1.27 mm (.050 inch) electrical engagement.

3.16 Gauge location. Using test gauges as specified on figure 4, the axial location of contacts shall be

measured as specified in 4.6.12. Gauge location measurements shall fall within the range specified

(see 3.1).

3.17 Gauge retention. When tested as specified in 4.6.13, the test gauges as specified on figure 5

shall be retained in the contact cavities and the axial displacement of the test gauges while under load

shall not exceed 0.30 mm (.012 inch).

3.18 Contact retention. When tested as specified in 4.6.14, the axial displacement of the contact shall

not exceed 0.30 mm (.012 inch). No damage to contacts or inserts shall result.

3.19 Altitude low temperature. When tested as specified in 4.6.15, the connector shall meet the

requirements of dielectric withstanding voltage at sea level specified in 3.12 and insulation resistance at

ambient temperature specified in 3.11.

3.20 Accessory thread strength. Applicable to MIL-DTL-83538/4 receptacles only to verify the rear

threads. When tested as specified in 4.6.16, the receptacles shall be capable of withstanding a torque of

28.3 � 2.8 Newton-meters (20 � 2 ft-lb). There shall be no damage to the threads.

3.21 Vibration. Qualification only. When tested as specified in 4.6.17, there shall be no electrical

discontinuity and there shall be no disengagement of the mated connectors, backing off of the coupling

mechanism, evidence of cracking, breaking, or loosening of parts.

3.22 Shock. When tested as specified in 4.6.18, there shall be no electrical discontinuity and there

shall be no disengagement of the mated connectors, evidence of cracking, breaking, or loosening of

parts.

3.23 Shell-to-shell conductivity. Not applicable to MIL-DTL-83538/11 buffer plug. When tested as

specified in 4.6.19, the resistance from launcher receptacle shell to the buffer plug of a mated launcher

receptacle/buffer plug assembly shall not exceed 2.5 milliohms. The resistance from the launcher

receptacle rear threads or the nearest accessible point to the store receptacle rear threads shall not

exceed 8 milliohms. After conditioning (salt spray and coupling torque) the above values may increase

100 percent.

3.24 Humidity. When tested as specified in 4.6.20, wired, mated connectors shall show no

deterioration which will adversely affect performance of the connector. Following the test, and during the

final cycle, insulation resistance shall be 100 megohms or greater.

3.25 Shell spring finger forces. When tested as specified in 4.6.21, the forces necessary to engage

and separate plugs with receptacle shells shall be within the axial force of 2 Newtons (.5 pound)

minimum, and 156 newtons (35 pounds) maximum.

3.26 EMI shielding. When tested as specified in 4.6.22, the EMI shielding capabilities of mated shells

shall be not less than that specified in table III at the specified frequencies.