It is a 50 Ohm design, delivering a 0.2 dB insertion loss across the band, with a 500 V voltage rating.
The key distinction from a 75 Ohm BNC is the dielectric and center contact geometry; this part is built for 50 Ohm systems.
This connector ships as a 4-piece kit: the connector body, one center contact, one ferrule, and one sleeve. The crimp termination requires a specific tool for RG-179/187 — the ferrule compresses over the braid, and the center contact crimps onto the conductor. The PTFE dielectric is pre-installed in the body. No soldering is needed at the shield; the crimp provides a gas-tight connection and consistent 50 Ohm impedance through the transition.