What are the different types of threads on a bolt?

Six Most Common Types of Threads

  • UN/UNF.
  • BSPP (BSP, parallel)
  • BSPT (BSP, tapered)
  • metric parallel.
  • metric tapered.

What types of threads are used on nuts and bolts?

Generally, there are two thread series, namely The ISO Metric Screw Thread (in millimetres) and The Unified Screw Thread (in inches). For both these series, there are two types of threads – fine thread and coarse thread.

What are the three types of bolt threads?

There are three standard thread series in the Unified screw thread system that are highly important for fasteners: UNC (coarse), UNF (fine), and 8-UN (8 thread).

What are the two most common thread forms?

The most common thread types are the inch-based Unified coarse / fine (UNC/UNF) and metric coarse / fine.

What is the most common thread form?

The most common of all of the thread types is the unified national coarse type. UNC threads are commonly used for fasteners because they fit deeper and are more generic than fine threads, which allows for easier removal if needed.

How do I choose a bolt size?

A typical rule of thumb . . . Use a bolt diameter that is 1.5 – 2.5 times (up to three times) the thickness of the thinner material you are bolting together. So, for 1/8″ material, a 1/4″ diameter is often a good bolt choice. For 1/4″ thick material, perhaps a 3/8″ or 1/2″ bolt.

What are male and female threads?

The terms Male and Female always refer to the threads on the fitting. Male threads are on the outside, like a bolt. Female threads are on the inside, like a nut. The male threads screw into the female threads. This sometimes leads to confusion when dealing with hard brake lines and other rigid tubing.

What are standard pipe threads?

Commonly used sizes are 1⁄8, 1⁄4, 3⁄8, 1⁄2, 3⁄4, 1, 11⁄4, 11⁄2, 2, 21⁄2, 3, 4, 5, and 6 inch, as pipe and fittings by most U.S. suppliers. Sizes smaller than 1⁄8 inch are occasionally used for compressed air, while sizes larger than 6 inches are often joined by other methods.

How many threads protrude from a nut?

One notable exception to this is for nuts with a locking feature at the top – or toplock nuts. This includes all nylon insert nuts. For these, it is best to have a minimum of 3 threads protruding through the nut to ensure that the locking feature is engaged on a fully formed external thread.

Which type of thread is used in a hex bolt?

Hex bolts have hexagonal heads and machine threads for use with a nut or in a tapped hole. Also known as hex cap screws or machine bolts. A bolt with a six sided head.

What is the standard thread series for A193 bolts?

What is the standard thread series for A193 bolts? Unlike most other ASTM specifications covering construction fasteners, the A193 specification requires 8 threads per inch for bolts larger than 1″ diameter.

What is the thread length of a bolt?

Standard Thread Length. Bolt lengths ≤ 6″: Thread length = (2 X diameter) + 1/4″ Bolt lengths > 6″: Thread length = (2 X diameter) + 1/2″ Note: Most stock hex bolts 10″ and longer will have 6″ of thread.