Summary:Stud bolts and nuts are fasteners used for joining...
Stud bolts and nuts are fasteners used for joining different parts together.
They are commonly used for joining flanges to permanent fixtures, such as valves, pipes, and other devices. These bolts can be made out of steel, alloy, or stainless steel. Stainless steel is most commonly used in the oil and gas industry, but can also be used in other industries.
The types of stud bolts include fully threaded, cut-thread, welded, and tap-end. Tap-end studs have a shaft and a long thread that enables the nut to be housed. A chamfered point is also common on these studs.
Studs are generally identified by material identification stamps on one end, grade markings on the other, or color-coded markings. In addition to these markings, the stud bolts are typically coated with a dacromet. This coating increases corrosion resistance. There are several different types of coatings, including yellow zinc, xylan, and hot dipped galvanized.
For a stud bolt to be functional, it needs to be manufactured to specific specifications. It is also important that it be assembled properly. If not, it will become difficult to remove the studs and nuts. Stu bolts and nuts should be inspected visually and checked for surface defects.
Studs and nuts are available in a variety of sizes and grades. For example, UNF (fine thread) and UNC (large thread) are popular for small parts. They are also useful for sensitive parts. While the UNC is most commonly used for steel, aluminum, and iron can also be used. All of these threads are threaded on both sides of the bolt.
When a stud and a nut are mated, the torque is distributed evenly, which reduces the chance of gasket failure. In addition, the stud and nut connect tightly because of a combination of friction and compression.
The standard for studs is ASTM A193, which covers the material qualities of studs, and the grade markings of the material. Similarly, ASME B16.5, which covers the use of stud bolts on flanges, includes a specification for studs and nuts. Both ANSI and ISO standards also provide standards for studs.
To select the appropriate size and type of stud and nut, you will need to determine the diameter and length of the bolt and nut. Ideally, the bolt should be able to cover the entire nut. You can use a metric stud bolt-to-nut table to determine the appropriate size.
Depending on the type of stud and nut you choose, the coating can also increase corrosion resistance. Studs and nuts are often coated with a hot deep galvanized finish, but Xylan, yellow zinc, or other specialty coatings are available. Some of these coatings are applied after a stud is mated, but many are applied during the manufacturing process.
The metric stud bolt-to-nut chart can help you determine the appropriate size and type of stud and nuts. You may also want to look at the ASTM A194 material standard, which lists the grades of nut materials compatible with a particular bolt.