MIL-DTL-26518C
3.6 Performance. Connectors shall be designed to meet the performance requirements specified herein. Class H and R
connectors shall be mounted and mated as shown on MS24287 unless otherwise specified.
3.6.1 Dry arc resistance. When tested as specified in 4.7.2 the dry arc resistance of insert material disk specimens, conforming
to designation ASTM D5948 Phenolic with mineral/glass filled, shall be a minimum of 115 seconds when tested in accordance with
ASTM D495, except as otherwise specified in 4.7.2.
3.6.2 Magnetic permeability (class R). Unless otherwise exempted by this specification all component parts of class R
connectors shall be of a nonferrous material or a material generally considered to be nonmagnetic. When tested as specified in 4.7.3,
the magnetic permeability of the assembled connector shall be less than 2.0µ.
3.6.3 Connector mating and unmating forces. The axial force required to fully mate or separate the plug and receptacle shall not
exceed the values listed in table II when tested as specified in 4.7.4, either at room temperature or at 125°C +3°C, -0°C.
TABLE II. Mating forces.
Shell size
Pounds (kg)
60 (27.21)
A
40 (18.14)
B
25 (11.34)
C
3.6.4 Maintenance aging. Maintenance aging shall be performed before any environmental testing see 4.7.5.
3.6.5 Contact insertion force. When tested as specified in 4.7.6, the individual contact insertion forces shall not shall not exceed
15 pounds (6.80 kg). The applicable insertion tool shall be used for this test.
3.6.6 Thermal shock. After testing in accordance with 4.7.7 and after subjection to the temperature extremes shown in table III,
connectors shall show no evidence of cracking, fracture, or other damage detrimental to the operation of the connector.
TABLE III. Thermal shock cycling extremes.
Extremes
Degrees C
+0
Low
-55 -3
+0
High
+260-3
3.6.7 Dielectric withstanding voltage.
3.6.7.1 Dielectric withstanding voltage, sea level. The connectors shall show no evidence of breakdown or flashover when tested
in accordance with 4.7.8.1.
3.6.7.2 Dielectric withstanding voltage, altitude. Completely wired and assembled connectors shall show no evidence of
breakdown when tested in accordance with 4.7.8.2.
3.6.8 Fluid immersion. After immersion in the fluids specified in 4.7.9, unmated connectors shall mate properly with counterpart
connectors.
3.6.9 Vibration. When tested in accordance with 4.7.10, connectors shall not crack or break and there shall be no loosening of
parts. Connectors shall be in full engagement during vibration. Interruption of electrical continuity shall not be longer than 10
microseconds.
3.6.10 Physical shock. During and after testing in accordance with 4.7.11, connectors shall show no sign of damage.
3.6.11 Durability. When tested in accordance, with 4.7.12, mated pairs of fully assembled connectors shall show no mechanical
or electrical defects.
3.6.12 Moisture resistance. During or after the test specified in 4.7.13, the insulation resistance values shall not be less than
1,000 megohms.
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