MIL-DTL-55302/68D
Requirements:
Dimensions and configuration: See figure 1 and table I.
Material: In accordance with MIL-DTL-55302, except:
Body - reinforced epoxy resin or equivalent.
Plating: In accordance with MIL-C-39029/57.
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 tested as 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 the maximum diameter pin and withdraw the minimum diameter pin shall be measured and shall meet the
requirements specified in table I. The depth of insertion shall be not less than 0.205 inch (5.21 mm) measured
from the face of the insert of 0.140 inch (3.56 mm) measured from the end of the socket body, but the pins shall not
bottom in the socket.
TABLE I. Engaging and separating forces.
Mating
Engaging test
Maximum
Separating test
Minimum
end
pin diameter
engagement
pin diameter
separation
size
in inches
force
in inches
force
(ounces)
(ounces)
+0.0002
+0.0000
0.0305
(0.005)
0.0295
22
12
0.75
(0.775)
-0.0000
(0.749)
-0.0002
(0.005)
Contact resistance: With a test current of 3A 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.
Dielectric withstanding voltage:
Sea level: 1,000 volts rms, 60 Hz, ac.
High altitude: 275 volts rms, 60 Hz, ac.
Current rating: 3.0 amperes.
Insert arrangement: See figure 2.
Mating connectors: See MIL-DTL-55302/67 and MIL-DTL-55302/69.
Contact insertion and removal tool: See MIL-I-81969/8.
Quality conformance inspection:
Group A inspection: Delete mating and unmating.
Group B inspection: Add mating and unmating.
Part or identification number (PIN): M55302/68-(dash number from table II).
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