MIL-DTL-55302/71D
Requirements:
Dimensions and configuration: See figure 1.
Material: In accordance with MIL-DTL-55302, except:
Body - reinforced epoxy resin or equivalent.
Plating: The contact plating shall be gold in accordance with ASTM B488, type II, code C, class 1.27 over 100
microinches of copper in accordance with SAE-AMS-2418.
Contact identification: Contact locations are identified numerically as shown on figure 2.
Mating and unmating: The maximum mating force, in pounds, shall be 0.5 times the number of contacts, and the
withdrawal force, in pounds, shall be a minimum of 0.08 times the number of contacts and shall not exceed the
measured insertion force.
Contact engagement and separation forces: When specified herein, the engaging and separation forces shall be
within the applicable limits specified in table I. Cylindrical steel or tungsten carbide test pins having spherical tips
and a surface finish not exceeding 3 microinches roughness for steel pins or 10 microinches for tungsten carbide
pins, shall be engaged with and separated from the socket contacts. The forces necessary to insert and withdraw,
first the maximum diameter pin and then the minimum diameter pin shall be measured. The depth of insertion shall
not be less than 0.150 inch measured from the face of the insert, but the pins shall not bottom in the sockets for the
71-01 connectors. The depth of insertion shall not be less than 0.205 inch measured form the face of the insert or
0.140 inch measured form the end of the socket body, but the pins shall not in the socket for the 71-02 connectors.
TABLE I. Engaging and separating forces.
Minimum
Separating test
Maximum
Engaging test
Mating
separation
pin diameter
engagement
pin diameter
end
force
in inches
force
in inches
size
(ounces)
(ounces)
+0.0002
+0.0000
22
0.0305
12
0.0295
0.75
-0.0000
-0.0002
Contact resistance: With a test current of 3 A dc, the average resistance of all contact pairs measured shall not
exceed 0.010 ohm, and no individual contact pair shall have a resistance exceeding 0.020 ohm.
Oversize pin: The connectors shall exclude a .038 minimum diameter pin.
Dielectric withstanding voltage:
Sea level: 1,300 volts rms, 60 Hz, ac.
High altitude: 325 volts rms, 60 Hz, ac.
Current rating: 3.0 amperes.
Insert arrangement: See figure 3.
Mating connectors: See MIL-DTL-55302/70.
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