Threaded studs are used in all aspects of construction and mechanical engineering. They are made of various materials and come in a variety of sizes and shapes.

Depending on the product, threads may extend just partially or fully throughout the entire length of the rod. This makes them ideal for applications where a lot of tension is being applied to the material.

Tap-End Studs
Tap-end studs have a short thread length on one side, called the tap end. This is the side that is threaded into a tapped machine hole, and is typically threaded to a class UN-3A fit. The other end, or nut end as it is sometimes called, is longer and may be chamfered or rounded.

Tap-end studs are used in a variety of applications from automotive to industrial, and are available in all the usual alloys. Sigma Fasteners stocks a wide assortment of the finest grade tap end studs, including A193 grades in Hastelloy C276 (Alloy C276), Carpenter 20 (Alloy 20), Duplex 2205, 316 stainless steel and 18-8 stainless steel. Depending on the application, tap end studs are a better choice than their single ended cousins in many instances. The best part is that they are less expensive, can be plated or coated, and are more convenient to install and remove in the field. They are also more versatile, allowing for less thread wear than their single end counterparts.

Nut-End Studs
A stud is a type of fastener that is usually paired with nuts at both ends. It can be used in a variety of applications, from flange connections to vehicle wheel locks.

A fully threaded stud is the most common type of stud available. It has a short length of thread at one end that's intended to screw into a tapped hole. The other end is longer and usually paired with a nut.

Often, studs are measured in inches from the first thread at one end to the first thread at the opposite end. This is known as the "1st/1st" method.

Tap-end studs are another type of stud that's commonly used in a variety of different applications. They have a shorter thread at one end that's intended to be screwed into a tapped hole, then an unthreaded middle shank and a longer thread on the other end.

Double-End Studs
Double-end studs are a type of fastener with exterior threading of equal lengths on both ends. However, the middle of the shank is smooth and unthreaded. This is different from a fully threaded stud bolt, which does not have a non-threaded center section.

Stainless steel double ended threaded studs are used in applications like aircraft exhaust manifolds, oil drilling equipment, power generation, petrochemicals, gas processing, spiral welded tube for burner pipes and flues, sea water equipment and heat exchangers. They have higher tensile strength and are corrosion resistant. They are also available in a variety of finishes, including black oxide, chromium, brass plated, cadmium and zinc plated. The studs are RoHS compliant and UL(r) listed. Special orders are welcome and can be produced to customers’ specifications.

Threaded Rod
Threaded rods are long metal fasteners that feature threading on both ends, like a bolt with a head. They can be made from a variety of materials including copper, bronze, and steel.

They can also be alloyed with titanium to add strength and oxidation resistance. They are commonly used in machine building and other industries that require heavy-duty load-bearing.

Depending on the application, threaded rods can be curved to fit the space where they need to go. They are typically shaped into a rectangular or square shape, but can be bent in any direction.

Threaded rods are available in a range of sizes, grades, materials, and coatings to suit different applications. They are especially useful in tension-bearing applications where they need to withstand high levels of stress.