What this 75 Ohm SMB plug is for
The 75 Ohm impedance — not the more common 50 Ohm — matches the characteristic of that specific cable, so swapping in a standard 50 Ohm SMB plug would shift the return loss and insertion loss at the junction. The snap-on fastening gives a quick mate and disconnect for field-service or test points where you need to break the line without tools.
What the 500-cycle rating means on the bench
That cycle count puts it in the moderate-duty range — fine for a piece of test equipment or a panel jack that gets reconnected a few times a week over a few years, but not a daily-remate production fixture.
Termination and shield termination
Contact termination is solder; the shield is crimped.