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

Hex bolt diameter

Resources

Diameter and Thread count

Matching Products

Click on a product # for additional info

Prod. # Description Buy
2980
SAE flat washers, Zinc plated steel, 1/2"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
$0.12 / ea
$8.68 / 100
$73.80 / 1,000
2998
USS flat washers, Zinc plated steel, 1/2"
USS pattern is the most common type of flat washer.
$0.18 / ea
$12.17 / 100
$103.00 / 1,000
3028
Lock washers, Zinc plated steel, 1/2"
Split lock washers place tension against a nut after tightening, to help prevent loosening.
$0.10 / ea
$6.66 / 100
$56.50 / 1,000

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.