Stud bolt specifications

Written by danielle hill
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Stud bolt specifications
(Please publish without an image.) (barb bolt image by Maksim Shebeko from

Stud bolts, also known as studs or threaded rods, are rod-shaped metal connector materials with threading extending along their entire length. Stud bolts can serve in a range of applications, with various types designed to suit each function. Typically, stud bolts are made of stainless steel, regular steel or steel alloys. (See references 1 and 3.)

Continuous Thread Studs

Some stud bolts have continuous threading along their entire length. These studs may come in either stainless or regular steel. Dimensions vary, with an array of standard sizes in addition to custom-sizes available through certain manufacturers. An extremely small continuous-thread stud can measure as little as 3/4 inches long and 1/4 inches in diameter. As the stud has no head, its diameter is constant all the way along its length. An extremely large continuous-thread stud may measure up to 8 inches long and 3/4 inches in diameter. Standard diameters include 1/4, 5/16, 3/8, 1/2, 5/8 and 3/4 inches. Standard lengths span from 3/4 to 8 inches, with each larger size increasing by 1/4 or 1/2 inch intervals. (See references 1-2.)

Studs for Pressure-Temperature Piping

Like continuous-thread studs, stud bolts designed for high pressures and temperatures also have threading along their entire length. They are also typically available in the same sizes, from 3/4 up to 8 inches in length and in six diameter sizes, between 1/4 and 3/4 inches across. However, unlike the regular continuous-thread studs, those designed for pressure-treated piping are made with steel alloys instead of stainless or regular steel. This allows them to withstand the high temperatures or high pressures present wherever they are used. (See reference 3.)

Double-End Studs

Double-end studs, like other stud bolts, can attach to threaded holes at either end. However, unlike continuous studs or high temperature-pressure studs, the double-end stud doesn't have continuous threading across its entire length. Instead, there is a short, unthreaded section at the midpoint of the stud. This limitation requires that the stud is screwed an equal distance into each of the materials it joins. In some cases, the limitation can aid in the strength and appropriate dimensions of the joint. However, a double-end stud isn't as flexible for varied applications as a continuous stud would be. Because double-end studs tend to serve somewhat specific purposes, you may need to custom-order them to the specific size needed. (See reference 4.)

Tap End Studs

Tap-end studs, like double-end studs, have two threaded ends with an unthreaded section in the middle. However, a tap end stud has one of its threaded sections shorter than the other. The shorter end is called the tap end, designed for screwing into a tapped hole. The other end, called the nut end, has threading to fit with a class UNRC-2A threaded nut. The tap end has a chamfered, or slightly tapered point, whereas the nut end may be either chamfered or rounded. (See references 5-6.)

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