OVM, Inc.

BNC Connectors specifications.

BNC Connectors are miniature, light-weight and durable units suitable for a wide range of applications.
Mating is by a 2 stud bayonet lock.

50 Ohm BNC bulkhead specs below:

Nominal Impedance: 50 Ohms
Frequency Range 0-4GHz
Voltage Rating: AC 500V
Withstanding Voltage: 1500 Volts RMS
Insulation Resistance: 5000 Megohms MIN.
Temperature Range 67 to 390 F
Vibration: Mil Std. 202 Method 204
Shock:  Mil Std. 202 Method 202
Moisture Resistance: Mil Std. 202 Method 105
Body Housing: Brass
Male Contact: Brass, Gold Plated
Female Contact: Brass, Gold Plated
Dielectric: Delrin or Teflon
75 Ohm BNC bulkhead specs below:

Nominal Impedance: 75 Ohms
Frequency Range 0-4GHz
Voltage Rating: AC 500V
Withstanding Voltage: 1500 Volts RMS
Insulation Resistance: 5000 Megohms MIN.
Temperature Range 67 to 390 F
Vibration: Mil Std. 202 Method 204
Shock:  Mil Std. 202 Method 202
Moisture Resistance: Mil Std. 202 Method 105
Body Housing: Brass
Male Contact: Brass, Gold Plated
Female Contact: Brass, Gold Plated
Dielectric: Delrin or Teflon