The 6-1337583-0: Right-angle surface-mount termination lets it sit flush at the board edge, saving vertical clearance in compact RF modules.
RF Performance and Contact Design
Insertion loss is rated at 0.1 dB — that is low enough to ignore in most link budgets, but worth noting if you are stacking several connectors in a cascade. Beryllium copper holds its spring force over 500 mating cycles, so the contact resistance stays stable through repeated connect-disconnect cycles in test or field-service gear.
Surface-mount, right-angle orientation — the signal pin and shield legs solder directly to the PCB pads in a single reflow pass.