NBB75DFIB Recessed bulkhead jack, black D-shape housing, feed through, isolated.   BNC 75 Ohm / Bulkheads 75 BNC Chassis Connector Flush mount bulkhead jacks, also available in D-shape housing. Extremely robust and non-abrasive socket. Gold plated center contact. Excellent return loss / VSWR data TECHNICAL DATA Electrical Impedance: 75 Rated voltage: 500 V ac rms Insulation resistance: > 5 G Dielectric withstanding voltage: 1500 V ac rms VSWR / Return Loss: < 1.03 / > 37 dB up to 1 GHz < 1.05 / > 32 dB up to 2 GHz < 1.08 / > 28 dB up to 3 GHz Inner contact resistance: = 3 m (initial) Outer contact resistance: = 2 m (initial) Mechanical Durability: > 1000 cycles Engagement force: = 25 N Materials D-shape housing: ZnAl4Cu1, gal Ni or black Cr plating Ground contact: Stainless steel OPTALLOYｮ coated Center contact: CuZn39Pb3 gal 0.2 mm AuCo Insulator: Teflon PTFE Insulation shell: POM Temperature range: -30ｰC to +85ｰC