For socket wrenches to fit metric bolts, go here.
The tables below show the commonly-available sizes of socket wrench and the fasteners they fit. The 8-pt sockets fit only square heads. A 12-pt socket fits both hexagonal and square heads. Twelve-point sockets also fit 12-pt heads (which are found only in aerospace bolts).
Sockets are made that are deeper than the normal socket, so that they will fit over bolts that protrude so far that the normal socket will not come down far enough to engage the the nut.
One end of a socket has a square recess which fits the socket wrench. In consumer wrenches, the square drives are ¼″, 3/8″, ½″, and ¾″. In the 1940's, Snap-On made sockets with a 5/16″ drive.
| Size | Drive size | Fits head or nut of bolt with this diameter | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ¼″ | 3/8″ | ½″ | ¾″ | |||||||||||||
| 6 pt |
12 pt |
6pt d |
6 pt |
8 pt |
12 pt |
6pt d |
12pt d |
6 pt |
8 pt |
12 pt |
6pt d |
12pt d |
12 pt |
current fasteners | ||
| 5/32" |  |
#0, #1 nuts | ||||||||||||||
| 3/16" | |
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#2, #3 nuts | ||||||||||||
| 7/32″ | |
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| 1/4" | |
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#4 nuts | |||||||||||
| 9/32" | |
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| 5/16" | |
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#5, #6 nuts | |||||||||||
| 11/32" |
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#8 nuts | ||||||||||||
| 3/8" | |
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¼″ square, #10 nut | |||||||
| 7/16" | |
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#12 nut, ¼″ except sq. | ||||
| ½" | |
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5/16" | ||
| 9/16" | |
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3/8" | 5/16 hex nut pre-1950s |
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| 19/32" | |
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| 5/8" | |
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7/16" bolts, sq. nuts | 3/8" hex nut pre-1950s |
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| 21/32″ | |
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| 11/16" | |
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7/16" hex nut | ||||||
| 3/4 | |
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½" | 7/16 hex nut pre-1950s |
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| 25/32" | |
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| 13/16" | |
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9/16" hex bolts | ½" hex nut pre-1950s |
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| 7/8" | |
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9/16" hex nuts | ||||||||
| 15/16" | |
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5/8" | ||||||||||
| 1″ | |
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5/8 hex nut pre-1950s |
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| 1 1/16″ | |
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| 1 1/8″ | |
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| 1 3/16″ | |
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| 1 1/4″ | |
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| 1 5/16″ | |
5/8 | ||||||||||||||
| 1 3/8″ | |
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| 1 7/16″ | |
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| 1 ½″ | |
1 | ||||||||||||||
| 1 5/8″ | ||||||||||||||||
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Copyright © 2000 Sizes, Inc. All rights reserved.
Last revised: 8 November 2003.