SMA Plug for RG-58 Coax — 50 Ohm, 12.4 GHz
The 901-9876-RFX: The shield terminates via crimp, the centre conductor via solder — a standard combination that gives a reliable, repeatable RF connection without requiring a full crimp die set for the centre pin. Rated to 12.4 GHz maximum frequency, this plug covers the L, S, and C bands plus most of the X band — sufficient for Wi-Fi, cellular backhaul, GPS, instrumentation, and test equipment. The 500-cycle mating life, backed by gold plating on the centre contact, means it holds up under repeated connect-disconnect in lab or field-service use.
The 901-9876-RFX is specced for RG-58, 58A, 58B, 58C, 141, 303, LMR-195, Belden B7806A, and 9907 cables. These are all 50 Ohm coax types with a nominal 0.195-inch jacket diameter and a 0.037-inch solid or stranded centre conductor.
How It Compares to Nearby Siblings
The 901-9881-RFX is the closest functional peer — same SMA plug format, same 50 Ohm impedance, same nickel body, same 500-cycle rating. The key difference: the 901-9881-RFX targets RG-174, 188, 316, and LMR-100 cables (smaller 0.110-inch jacket) and is rated 375 V versus the 901-9876-RFX's 500 V. If your harness uses RG-58, the 901-9876-RFX is the correct cable-group match; the 901-9881-RFX is for thinner, lower-voltage coax. The 901-9867-RFX is also an SMA plug but with a gold body finish and solder shield termination — it mates with RG-405 semi-rigid cable and reaches 18 GHz. That part is for semi-rigid installations where you solder both the shield and centre pin; the 901-9876-RFX is the crimp-shield alternative for flexible RG-58 runs.