What Is The Difference Between Double-ended Studs And Single-ended Studs?

A Double End Stud is a threaded fastener with threads at both ends and an unthreaded portion between the two threaded ends. A stud or stud is a threaded rod with threads at both ends and a smooth shank equal to the nominal diameter; and is designed to fit in a threaded hole with one threaded end and a hex nut at the other end. The device clamps onto the stud screwed into the surface.

Another name sometimes used for a stud is Tap End Stud, or "prefabricated stud." Tap-end studs have different thread lengths at both ends. It has a short thread for tapped holes and usually has a class 5 mating thread to ensure full engagement.

Note that for metric studs, the short thread is not included in the nominal length of the stud. Studs are used for flange bolting or other applications that require or require spray welding from both ends.

Since the stud is threaded on both sides, it makes it easier to hold the two pieces together, usually with a hex nut (and sometimes with a lock nut). Washers can be used to protect mating surfaces from damage during stud tightening.

These threaded products are very common among gearbox manufacturers and open gears. Other common applications for double-ended studs, threaded single-ended studs, and fully threaded studs include wind towers, nuclear power, marine, railroads, construction, and various specialty machinery manufacturing. The diversity of these industries requires studs to be made from all types of non-ferrous metals and other specialty materials.