What Are Stud Bolts For Flanges

A stud bolt is a type of threaded rod that regularly features threading across the complete length of the bar. When paired with nuts, a stud bolt can act as an essential component for flanged joints so that they may be properly sealed. Depending on the need of the assembly or application, there are a variety of stud bolts and nuts that fall under various specifications which may be advantageous for assemblies. In this blog, we will provide a brief overview of stud bolts that are used for flanges, assisting you in your search for the correct fit for your particular application.

When used for plumbing, piping, or similar applications, a flange joint refers to the connection point where each piece features a protruded ridge, lip, or rim. With these flanges, stud bolts and nuts can be used to fasten pieces together for the security of the assembly. For installing the stud flange bolt, the fastener is passed through the holes of mating flanges before being secured as nuts are tightened to each end. It is important that the correct amount of torque is applied to the nuts as it can affect the security of the assembly and thus performance.

When choosing between stud flange bolts, there are a few considerations that should be made before making a final decision. For one, the length of the bolt is crucial for ensuring a proper fit, as a bolt that is too long may be constricted by space while one that is too small may prevent the addition of nuts. Stud bolt length is often measured by its overall length (OAL) or from its first usable thread to first usable thread (FTF). FTF length can be calculated by removing a quarter of an inch from the OAL length, and such measurements are the standard when used for piping. Having the length and diameter of stud flange bolts is important as it will decide the diameter and ratings needed for the flange itself.

Stud bolt thread pitch is another component factor to consider, and it is defined as the steepness of the angle thread. When measuring thread pitch, using threads per inch is the most common method. The V-profile thread pitch is the most common due to how easy they are to inspect, and such threading features a 60 degree angle. There are a few common thread series that are used for fasteners, including the coarse thread, fine thread, and 8-thread series of components.

When choosing between stud bolts, there are a number of common materials that are used. Generally, the primary materials used for constructing stud bolts are ASTM A193, ASTM A453, ASTM A320, and ASTM A182. Within each group, there are also a number of grades that can be chosen as well. If there is a presence of aggressive fluids or harsh environments, stud bolts can be protected with the use of Xylan, Xylar, or other coatings.

When you are searching for top quality stud bolts, nuts, and flange components for your particular application, the experts at NSN Stocks can help you fulfill all your part requirements with competitive pricing and rapid lead-times. Across our manufacturer and part catalogs, we offer customers over 2 billion new, used, and obsolete components that have been sourced from leading manufacturers that we trust. If there are particular items listed on our website that you are interested in, we ask that you fill out and submit an Instant RFQ form at your earliest convenience. With the information that you provide us, our team can quickly craft you a specialized solution fit for your individual requirements. Get started on the purchasing process today and see how we can serve as your strategic sourcing partner.


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April 1, 2021
January 15, 2021

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