Hex bolt diameter is measured on the outside of the threads.

Hex bolt diameter

Diameter and Thread count

Matching Products

Click on a product # for additional info

Prod. # Description Buy
9489
SAE flat washers, Chrome plated steel, 1/2"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
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$1.49 / ea
$12.30 / 10
$113.00 / 100
9483
USS flat washers, Chrome plated steel, 1/2"
USS pattern is the most common type of flat washer.
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$1.49 / ea
$12.30 / 10
$113.00 / 100
9496
Lock washers, Chrome plated steel, 1/2"
Split lock washers place tension against a nut after tightening, to help prevent loosening.
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$2.04 / ea
$17.16 / 10
$157.00 / 100

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.