Hex bushings are used to reduce the size of female threads from a larger to a smaller diameter. Hex Bushings are threaded fittings that have male threads on the outside and female threads on the inside with a hex head used to tighten the fitting into the threaded opening. Merchant steel fittings are designed with Dryseal Taper Threads (NPTF) for more critical applications. NPTF Dryseal threads produce a mechanical seal by the mating and slight crushing of the threads when a wrench is applied to tighten the fittings.

Flanges connect with pipe and fittings to form a piping system for a variety of construction and manufacturing applications. Threaded flanges, also called screwed flanges, include threads inside the flange bore that connect to the external threads on a pipe without welding.