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What are the four basic dimensions of a bolt?

3 min read

Asked by: Bill Hersey

A U-bolt is measured by four dimensions: the length, the hook, the diameter, and the thread length.

What are the dimensions of a bolt?

Imperial Bolt Size Chart

Nominal Size Bolt Diameter ‘D’ Head Height ‘C’
9/16 0.5625 0.348
5/8 0.625 0.378
3/4 0.75 0.455
7/8 0.875 0.531

What basic dimension are used in describing machine bolts?

Typically, machine bolt sizes range from 1/4″ to 1 1/4″ for square heads and 3/8″ to 1 3/4″ in diameter for hex heads, and lengths span from about 3/4″ to 18″ for square and 6 1/2″ to 24″ for hex heads. Measure length from under the head to the threaded end of the bolt.

How are bolt measured?

To measure the diameter of screws and bolts, you measure the distance from the outer thread on one side to the outer thread on the other side. This is called the major diameter and will usually be the proper size of the bolt.

What are the three categories when sizing a bolt?

There are three main systems of bolt classification: SAE, Metric and ASTM.

How do you write bolt dimensions?

So when you read a bolt that says quarter 20 by 2 that means quarter inch diameter 20 TPI that's threads per inch which would be here.

What is the nominal diameter of a bolt?


The diameter equal to the external diameter of the threads or the overall diameter of the part. (Nominal diameter is more of a label than a size. For example, a bolt and nut may be described as being ½” diameter.

How do you describe a bolt?

Introduction. A bolt is a type of fastener, usually made from metal, that commonly comprises a head at one end, a chamfer at the other, and a shaft characterised by an external helical ridge known as a ‘thread’. Bolts are typically used to hold materials or objects together, or to position objects.

How are metric bolt sizes measured?

Metric Bolt Lengths

Socket head, pan head, button head and hex head bolts are measured from the underside of the bolt head to the end of the shaft. For flat head bolts, the length includes the bolt head height and for dome head bolts the length is measured from the thickest, highest point on the curved head.

What are machine bolts?

A machine bolt, also called a machine screw bolt, is a cylindrical fastener used to clamp two pieces of metal together. The bolt consists of a threaded shaft with a square- or hexagon-shaped head at one end. A hand or socket wrench that fits the head of machine bolt is used to tighten or loosen the fastener during use.

How are bolts classified on what basis & Types?

Bolts used in steel structures are of three types: 1) Black Bolts 2) Turned and Fitted Bolts and 3) High Strength Friction Grip (HSFG) Bolts. Bolt is a metal pin with a head at one end and a shank threaded at other end to receive a nut, as shown in Figure 6.

What does M14 mean on a bolt?

Thread Pitch

Metric Bolt Diameter M6 M14
Coarse Thread Pitch (mm) 1.0 2.0
Fine Thread Pitch (mm) .75 1.5
Extra Fine Thread (mm)

Are M6 and 1/4 the same?

A normal M6 screw is a rattly fit in a 1/4 BSF full nut.

What does M16 bolt mean?

Metric bolts are made fractionally under their stated size, for instance an M16 bolt will have a shank diameter of typically 15.97mm. This means that a 16mm bolt will fit through a 16mm hole but to allow for misalignment between parts it is common practice to drill bolt holes slightly larger.