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Material
Zinc plated grade 5 steel
Diameter
US
1/4"
(36)
5/16"
(36)
3/8"
(38)
7/16"
(35)
1/2"
(36)
9/16"
(24)
5/8"
(35)
3/4"
(31)
7/8"
(11)
1"
(12)
1-1/4"
(9)
1-1/2"
(9)
Thread density
Coarse
6
(9)
7
(9)
8
(12)
9
(11)
10
(17)
11
(18)
12
(12)
13
(19)
14
(18)
16
(35)
18
(47)
20
(53)
Fine
16
(35)
18
(47)
20
(53)
24
(35)
28
(17)
Length
US
3/8"
(1)
1/2"
(6)
5/8"
(6)
3/4"
(10)
1"
(14)
1-1/4"
(14)
1-1/2"
(16)
1-3/4"
(13)
2"
(18)
2-1/4"
(14)
2-1/2"
(18)
2-3/4"
(5)
3"
(20)
3-1/2"
(20)
3-3/4"
(1)
4"
(20)
4-1/2"
(20)
5"
(20)
5-1/2"
(18)
6"
(20)
6-1/2"
(2)
7"
(13)
8"
(13)
9"
(3)
10"
(6)
11"
(1)
Wrench size
7/16"
(36)
1/2"
(36)
9/16"
(38)
5/8"
(35)
3/4"
(36)
13/16"
(24)
15/16"
(35)
1-1/8"
(31)
1-5/16"
(11)
1-1/2"
(12)
1-7/8"
(9)
2-1/4"
(9)
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Product Catalog
»
Hex bolts
»
Hex bolts
Hex bolts, Zinc plated grade 5 steel
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
Diameter and Thread count
Coarse (standard) thread
1/4"-20
5/16"-18
3/8"-16
7/16"-14
1/2"-13
9/16"-12
5/8"-11
3/4"-10
7/8"-9
1"-8
1-1/4"-7
1-1/2"-6
Fine thread
1/4"-28
5/16"-24
3/8"-24
7/16"-20
1/2"-20
9/16"-18
5/8"-18
3/4"-16
See also
Metric hex bolts
A bolt with a six sided head.
