MIL-DTL-3786/20K
REQUIREMENTS:
Dimensions and configuration: See figure 1. Angle A° of 15° for switches of 30° angle of throw, 18° for
switches of 36° angle of throw, 22.5° for switches of 45° angle of throw, 30° for switches of 60° angle of
throw, and 45° for switches of 90° angle of throw.
Angle of throw: 30°, 36°, 45°, 60°, 90°.
Construction styles: Symbols E, F, J, and K.
Insulation: Symbol P (plastic).
Mounting hardware: Each switch shall be provided with one corrosion-resistant steel hexagon nut, .089
±.010 inch (2.26 mm ±0.254 mm) thick by .375 inch (9.53 mm) across the flats and one internal-toothed
lockwasher, .402 ±.006 (10.21 mm ± .152 mm) outside diameter.
Temperature-life characteristic: B (25,000 cycles) (-65°C and +85°C).
Vibration grade: 3 (10 Hz to 2,000 Hz).
Shock symbol: B (medium and high impact).
Altitude: C (70,000 feet).
Terminal strength (pull): A force of 1.5 pounds shall be applied to the terminals.
Terminal marking: Switches may be marked with terminal numbers on side of switch.
Stop strength: Stops shall withstand a force of 7.5 inch-pounds.
Flux seal: Applicable when specified in the Part or Identifying Number (PIN).
Low level circuit life: Applicable when specified in PIN.
Positive shaft grounding: Applicable when specified in PIN.
Rotational torque: The minimum and maximum value of torque determined for shaft rotation shall be
within limits specified in table I.
TABLE I. Rotational-torque limits.
Torque (in-lb)
Temperature
Minimum
Maximum
Room
0.5
1.5
Minimum
0.5
2.0
Life (rotational): The test loads for the applicable circuit conditions shall be as specified in table II.
Each of the loads, specified for the applicable environmental condition, shall be switched by at least
one rotor contact of the switch. Low level circuit life is applicable as specified by PIN.
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