B6121E1-ND3G-6-75.
3650327JACK, BNC ST 75R; Impedance:75R; Material, insulator:Teflon / Delrin; Plating:Nickel; Resistance, insulation:5000MR; Coaxial Connector Type:BNC; Coaxial cable type:RG179, RG179A, RG179B, RG187, RG187A; Frequency, operating max:1GHz; Material, female contact:Phosphor bronze; Material, male contact:Brass; Material, plug body:Brass; Plating, female contact:gold; Plating, male contact:gold; Resistance, centre contact:1.5mR; Resistance, outer contact:1mR; VSWR:1.05