threaded rod, also known as a stud, is a relatively long rod that is threaded on both ends; the thread may extend along the complete length of the rod. They are designed to be used in tension. Threaded rod in bar stock form is often called all-thread.It will engage two nuts, one on each end, or maybe more nuts if jam nuts or lock nuts are used.


Stud Bolt Specification

With respect to shape, there are three types of bolts:

1.Fully Threaded Stud

As the name suggests, they have full body coverage with threads for full engagement of the mattings nuts or similar parts.

Full Threaded Studs

 2. Tap End Stud

They have threads at extreme ends of the body with unequal thread engagement length

Tap end_mnk


3.Double End Stud

These bolts have equal thread length at both ends.



Each of them have different application.


Apart from these, there are stud bolts for flanges which are fully threaded with chamfered ends, and double ended with reduced shank for special bolting applications. For studs that are not completely threaded, there are two types of studs:


  1. Full-bodied studs: They have a shank equal to the major diameter of the thread. The stresses are greater in the threads than in the shank. They are weaker because metal is removed to create the thread, disturbing the grain of the steel.
  2. Undercut studs: They have a shank equal to the pitch diameter of the screw thread. They are designed to better distribute axial stresses. They (rolled thread) are also stronger because the metal is “rolled” up to the major diameter, not removed. This preserves the grain of the steel, and in some cases even enhances it.

Studs are only required in applications where it is exposed to fatigue. Cut threads are entirely suitable for many applications, even when rolled threads might be slightly stronger. Mass-produced fasteners (standard bolts and studs) are usually rolled but jobbed parts with custom features and small lot sizes are likely to be cut.


It is a bolt in the shape of the letter U with threading for screw on both the ends.

U-bolts have been used basically to support pipework, pipes through which fluids and gasses pass. As such, U-bolts were measured using pipe-work engineering speak. It described by the size of pipe it was supporting. They are also used to hold ropes together.


The nominal bore of a pipe is actually a measurement of the inside diameter of the pipe. Engineers are interested in this because they design a pipe by the amount of fluid/gas it can transport.

As U-bolts are now being used by a much wider audience to clamp any kind of tubing / round bar, then a more convenient measurement system needs to be used.

Four elements uniquely define any U-bolt:

  1. Material type (for example bright zinc-plated mild steel)
  2. Inside height (for example 110 mm)
  3. Inside diameter (for example 30 mm – the distance between the legs)
  4. Thread dimensions (for example M12 * 50 mm)

Two sided threads can be combined with nuts and Patti Clamps(linking), mainly used in the fixed tube such as pipes or flake content such as automobile plate spring, because of the way its fixed objects, like a person, is riding a horse is called U-bolt.


They have a wide range of application:

  • Chevy rear axle
  • Leaf Spring U for Heavy Trucks
  • Medium and Light Duty Trucks
  • Auto Applications