The body is nickel-plated brass, and the dielectric is PTFE, giving it a clean signal path from DC through the full 4 GHz band.
What comes in the bag and how it mounts
The BNC-BPR-3(40) ships as a kit: one connector body, one hex nut, and one solder tag. The nut secures the connector from the rear of the panel (bulkhead mount, rear-side nut), and the solder tag provides the shield termination point — you solder the cable braid or drain wire to the tag, then tighten the nut. The centre conductor terminates into a solder cup. This kit approach saves a separate parts order for the mounting hardware.
50 Ohm impedance and 4 GHz bandwidth — what that means for your RF line
The 50 Ohm impedance matches the characteristic impedance of standard 50 Ohm coax cables. The 4 GHz maximum frequency covers sub-4 GHz bands.