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Material
Zinc plated steel
Diameter
US
1/4"
(18)
5/16"
(19)
3/8"
(23)
1/2"
(20)
5/8"
(18)
3/4"
(17)
Thread density
Coarse (standard) thread
10
(17)
11
(18)
13
(20)
16
(23)
18
(19)
20
(18)
Length
US
1/2"
(3)
5/8"
(3)
3/4"
(4)
7/8"
(2)
1"
(5)
1-1/4"
(6)
1-1/2"
(6)
1-3/4"
(5)
2"
(6)
2-1/2"
(6)
3"
(6)
3-1/2"
(6)
4"
(6)
4-1/2"
(6)
5"
(6)
5-1/2"
(6)
6"
(6)
7"
(6)
8"
(6)
9"
(4)
10"
(4)
11"
(3)
12"
(4)
Wrench size
7/16"
(18)
1/2"
(19)
9/16"
(23)
3/4"
(20)
15/16"
(18)
1-1/8"
(17)
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Hex bolts
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Hex bolts
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Zinc plated steel
Hex bolts, Zinc plated steel, Coarse (standard) thread
Hex bolt diameter is measured on the outside of the threads.
Resources
US Hex bolt sizes
(opens in new window/tab)
Head/Wrench size table
US thread per inch table
Hex bolts, Zinc plated steel, Coarse (standard) thread
Diameter and Thread count
1/4"-20
5/16"-18
3/8"-16
1/2"-13
5/8"-11
3/4"-10
See also
Metric hex bolts
A bolt with a six sided head.