312C257GR1

Technical Characteristics

• Thread Class

  2a

• Overall Length

  1.938 inches nominal

• Overall Height

  1.625 inches nominal

• Center To Center Distance Between Mounting Facilities Parallel To Height

  1.250 inches nominal

• Distance Between Centerlines Of Mounting Facilities Parallel To Body Width

  1.250 inches nominal

• Threaded Device Type

  coupling facility

• Contact Removability

  nonremovable

• Polarization Method

  keyway or multiple keyway

• Thread Quantity Per Inch

  18

• Nominal Thread Size

  1.375 inches

• Terminal Location

  back

• Contact Surface Treatment

  silver

• Contact Surface Treatment Document And Classification

  qq-s-365 fed spec single treatment response

• Shell Material

  aluminum alloy

• Shell Surface Treatment Document And Classification

  qq-p-416,ty 2,class 3 fed spec all treatment responses (use only when all treatment is controlled by the same document and classifications are identical)

• Included Contact Type

  round socket

• Precious Material And Weight

  0.020 silver grains,troy

• Thread Direction

  right-hand

• Overall Width

  1.625 inches nominal

• Environmental Protection

  moisture proof and salt water resistant and vibration proof

• Unthreaded Mounting Hole Diameter

  0.115 inches minimum and 0.130 inches maximum

• Distance From Mounting Shoulder To Front Face

  0.750 inches nominal

• Mating End Quantity

  1

• Contact Maximum Current Rating In Amps

  73.0

• Contact Maximum Ac Voltage Rating In Volts

  500.0

• Contact Maximum Dc Voltage Rating In Volts

  700.0

• Insert Position In Deg

  0.0

• Shell Type

  solid

• Connector Locking Method

  externally threaded shell

• Insert Material

  rubber

• Terminal Type

  solder well

• Shell Surface Treatment

  cadmium and chromate

• Included Contact Quantity

  4

• Precious Material And Location

  contact surfaces silver

• Precious Material

  silver

• Thread Series Designator

  unef