The 172102H243RP: The RP-N interface reverses the gender of the center contact compared to a standard N plug — this plug has a female socket, so it mates with a male pin on the cable or bulkhead jack. It's built for Belden 9913, 9914, and LMR-400 cables, which are common low-loss coax lines used in antenna feeds, base station jumpers, and high-power RF links.
The 50 Ohm impedance and 11 GHz max frequency tell you this plug is good from DC through X-band — it'll handle Wi-Fi, cellular bands, and L-band GPS without a mismatch. The 0.15 dB insertion loss is typical for a quality N-type crimp connector at these frequencies; you won't see a measurable hit in a short jumper run. The 1500 V rating is higher than most RF connectors — it can take high-power RF or a DC bias on the center conductor without flashover.
Both the shield and center contact are crimp-terminated, so you need the correct hex crimp die for the ferrule and the center contact pin. The kit includes the ferrule, which compresses over the braid and jacket.
Both are 50 Ohm, 11 GHz, 1500 V, and 500 mating cycles. The difference is the center contact gender: the 172102H243RP (female socket) mates with a male pin on the cable or bulkhead, while the 172142 (male pin) mates with a female socket. The cable groups also differ — the 172142 covers RG-55, 142, 223, 400, not the Belden 9913/9914/LMR-400 that this plug is built for. Pick the one that matches your cable and the mating half's center contact.