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Material
Zinc plated steel
Diameter
US
1/4"
(1)
5/16"
(1)
3/8"
(1)
1/2"
(1)
5/8"
(1)
3/4"
(1)
Thread density
Coarse
10
(1)
11
(1)
13
(1)
16
(1)
18
(1)
20
(1)
Length
3-1/2"
Wrench size
7/16"
(1)
1/2"
(1)
9/16"
(1)
3/4"
(1)
15/16"
(1)
1-1/8"
(1)
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3-1/2"
External hex
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Hex bolts
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Hex bolts
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Zinc plated steel
Hex bolts, Zinc plated steel, 3-1/2"
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
1/2"-13
5/8"-11
3/4"-10
See also
Metric hex bolts
A bolt with a six sided head.
