Full Thread Studs
Full thread studs are made by cutting all thread rod to length or roll-threading pitch diameter cut blanks. One important consideration in ordering full useable thread studs is specifying the length. There are two standards. One is measuring the overall length of the part (this is how we typically supply our studs full-form). The other is measuring from the first full-form useable thread on one end to the first full thread on the other. As studs are generally chamfered on both ends, the first-to-first measurement will be 1 to 2 pitches less than the overall. First-to-first measurements are usually specified in high temperature and high pressure applications, particularly where ASTM A193 is specified.
Nickel Systems stocks all thread rod in Hastelloy® C276 (Alloy C276), Carpenter® 20 (Alloy 20), Duplex 2205, 316 Stainless and 18-8 Stainless, which can be cut to length and shipped in short order. We can also supply studs to A193 specs (B8, B8C, B8M, B8R, B8S, B8T), Monel® (Alloy 400, Alloy 500), AL6XN®, Nitronic® (50 and 60) and other non ferrous materials.
Double End Studs
Double end studs have threads on both ends of the same thread fit class. This is usually class 2A, or if looser tolerances are allowed, commercial nut fit. The body, the area between the threads, may be either equal to the nominal major diameter of the threads or equal to the pitch diameter.
Tap End Studs
Tap end studs have threads of different classes on each end. Usually the end with more thread has a class 2A thread and is designed to accept a nut. The short threaded end will generally have a tighter thread, which is meant to be screwed into a casting and resist disassembly.
Nickel Systems can provide tap end studs made to a print.