Standard ChartsMetric Charts

This table displays each of the five common socket sets and all of the standard socket sizes included with each set, sorted from smallest to largest.

Standard Socket Sizes

Some sockets sets may contain more or fewer sockets, or may contain multiple socket sets, however these are the most common metric socket sizes per set.

Standard Socket Size Chart

1/4” Socket Set3/8” Socket Set1/2” Socket Set3/4” Soket Set1” Socket Set
5/32 inch1/4 inch3/8 inch7/8 inch1-5/8 inch
3/16 inch5/16 inch7/16 inch15/16 inch1-11/16 inch
7/32 inch3/8 inch1/2 inch1 inch1-3/4 inch
1/4 inch7/16 inch9/16 inch1-1/16 inch1-13/16 inch
9/32 inch1/2 inch19/32 inch1-1/8 inch1-7/8 inch
5/16 inch9/16 inch5/8 inch1-3/16 inch2 inch
11/32 inch5/8 inch21/32 inch21/32 inch2-1/8 inch
3/8 inch11/16 inch11/16 inch1-5/16 inch2-3/16 inch
7/16 inch3/4 inch3/4 inch1-3/8 inch2-1/4 inch
1/2 inch13/16 inch25/32 inch1-7/16 inch2-3/8 inch
9/16 inch7/8 inch13/16 inch1-1/2 inch2-1/2 inch
15/16 inch7/8 inch1-5/8 inch2-5/8 inch
1 inch15/16 inch1-11/16 inch2-3/4 inch
1 inch1-3/4 inch2-15/16 inch
1-1/16 inch1-13/16 inch3 inch
1-3/16 inch2 inch
1-1/2 inch2-3/16 inch

Standard Socket Size F.A.Q.

What are standard sockets?

Sockets are designed to remove nuts and bolts of all sizes from vehicles and machinery. Standard sockets are based on the Standard Imperial(SAE) measurement system of of inches. Each standard socket will have it's size stamped on the side. Example: 1/4, 1/2 etc.

How can you tell the difference between metric and standard sockets?

Sockets of all kinds will have their size stamped on the side of the socket. If the size is given in millimeters(mm) it is a metric socket while if the size is given in inches or fractions of inches it is a standard socket.

Do imperial sockets fit metric?

Imperial sockets do not fit metric nuts and bolts exactly, however, a slightly larger standard socket can often be used on a metric fastener. See for useable socket size conversions.

What size is 1/4 in millimeters?

1/4 = 6.35mm, you would need to use a 7mm socket to fit a 1/4 inch bolt.

What's better 12 point or 6 point sockets?

A 6 point socket is better at removing nuts and bolts when a lot of torque is required. Because of increased contact area it is less likely than a 12 point socket to slip or round the edges of a bolt.

Are socket drives interchangeable with other size socket sets?

Socket drives are not interchangeable with sockets of a different drive size, however, a socket adapter can be used to mate different drive sizes and sockets. A socket adapter can be used with, for example, a 1/2 socket drive to make it work with a 3/8 socket.

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MM to Inch Conversion Chart

MM to Inch Conversion Chart

A simple measurement chart to help you convert millimeters(mm) to inches and fractions of inches. Metric to Standard chart includes decimal values.

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