MIL-PRF-62540A(AT)
3.3.7.3 Connector threads. The connector threads shall be coated with a viscous coating
conforming to a chemical composition formulated for use as a threadlocker on threaded fasteners,
that will not harden upon cure (see 4.6.2).
3.3.8 Fill factor. The fill factor of harness and cable assemblies shall be not more than
70% (see 4.6.2 and 6.3.2).
3.3.9 Spare wires. The harness and cable branches shall contain not less than 10% or at
least two spare wires without wire markings (see 4.6.2).
3.3.10 Elastomers. All age sensitive elastomers in harness and cable assemblies shall be
installed in the assembly within 8 quarters after the cure date (see 4.6.1 and 4.6.2).
3.4 Performance.
3.4.1 Direct current (dc) resistance. Unless otherwise specified on the harness or cable
assembly drawing, the dc resistance measured from the connector contact at one end of a wire
conductor to the corresponding contact at the other end (as indicated by the harness and cable
assembly wiring diagrams) shall not be greater than the following listed values:
22 AWG 1/ -
0.85 ohm
8 AWG - 0.03 ohm
20 AWG -
0.5 ohm
4 AWG - 0.015 ohm
16 AWG -
0.2 ohm
0 AWG - 0.005 ohm
12 AWG -
0.1 ohm
1/ American Wire Gauge (AWG) number.
When RFI shields are terminated at the connector shells, the dc resistance between any two
connector shells of the assembly shall not exceed 0.5 ohm (see 4.6.7).
3.4.2 Insulation resistance. Unless otherwise specified on the harness or cable assembly
drawing, the insulation resistance shall be not less than 100 megohms when measured at
500 +50 volts (V) dc applied for at least one second between connector pins and the assembly
connector and between isolated circuits (see 4.6.8).
3.4.3 Environmental. Assemblies shall meet the environmental requirements specified in
3.4.3.1 through 3.4.3.4. Assemblies exceeding 91.44 cm (3 ft) in length, after being exposed to
environmental conditions specified in 3.4.3.1 through 3.4.3.4, shall have a bend radius of not less
than 7.6 cm (3 in.) (see 4.6.9).
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