The TE Connectivity 504034-1 is an ST-style simplex plug from the LightCrimp XTC series, designed for field-termination of multimode fiber cable. It accepts a 2.5 mm jacketed cable and uses a bayonet lock for quick, secure mating with a standard ST receptacle. The stainless steel ferrule and aluminum body with black boot give it the durability for repeated connects in patch panels and test equipment — 500 mating cycles are rated. Typical insertion loss runs -0.4 dB, which keeps the optical budget tight for premise and campus fiber runs.
This is a field-terminable LightCrimp XTC plug — epoxyless, which means no curing oven needed. The strain relief and dust cap are built in, so the terminated end is protected until it mates. The 2.5 mm cable diameter acceptance is tight: measure your jacket OD before committing. The bayonet lock gives a positive twist-and-lock mate, and the simplex design means one fiber per plug, typical for duplex patch cords using two plugs.