# Quick Answer: What basic dimensions are used in describing machine bolts?

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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. Both square and hex heads are available.

## What are four basic dimensions of a bolt?

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

## How are machine bolts measured?

Fastener length is measured from where the material surface is assumed to be, to the end of the fastener. For fasteners where the head usually sits above the surface, the measurement is from directly under the head to the end of the fastener.

## What do the dimensions of a bolt mean?

The size of a metric bolt is specified using pitch, diameter, and length in millimeters. For example, in M8-1.0*20, the “M” means the Metric thread designation, the digit 8 refers to the Nominal diameter (in millimeters), 1.0 refers to the pitch, and 20 refers to the length.

## How do you specify a bolt dimension?

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 is nominal dia of bolt?

The size most commonly associated with screw threads is the nominal diameter. Nominal diameter is a more of a label than a size. For example, a bolt and nut may be described as being ½” diameter. … In fact, the bolt diameter is a little smaller and the nut diameter a little larger.

## How wide is a standard bolt?

The width of a bolt is usually 45 or 60 inches (1,100 or 1,500 mm), but widths may include 35–36 inches (890–910 mm), 39 inches (990 mm), 41 inches (1,000 mm), 44–45 inches (1,100–1,100 mm), 50 inches (1,300 mm), 52–54 inches (1,300–1,400 mm), 58–60 inches (1,500–1,500 mm) and 66 inches (1,700 mm), 72 inches (1,800 mm) …

## What is a 3/4 bolt?

Heavy Hex Bolt Dimensions

Bolt Diameter D H
Body Diameter Height
5/8 0.642 0.444
3/4 0.768 0.524
7/8 0.895 0.604

## How can you tell if a bolt is metric or standard?

Telling the difference between a metric and imperial bolt is easy. If the bolt has lines on the head its standard or imperial. If the bolt has numbers on the head then its metric.

## How wide is an M8 bolt?

Dimensions for DIN931 Hex Head Bolt

Diameter (d) Pitch Across Flats (s)
M7 1.0mm 11mm
M8 1.25mm 13mm
M10 1.5mm 17mm
M12 1.75mm 19mm
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## How wide is an M6 bolt?

You can identify an M6 screw by measuring the diameter with a ruler. It’ll be 6 mm, or slightly more than 7/32 inches (0.228″).

## What is M10 bolt size?

Metric Hex Bolt Dimensions

NOMINAL SIZE (D) BODY DIAMETER HEAD THICKNESS
m10 10.00 6.63
m12 12.00 7.76
m14 14.00 9.09
m16 16.00 10.32

## What is M12 in standard?

Table 3.

Metric Closest Inch
M10-1.5 3/8-16 (Smaller)
M12-1.75 1/2-13 (Larger)
M14-2.0 9/16-12 (Larger)
M16-2.0 5/8-11 (Smaller)