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
3052
SAE flat washers, Zinc plated grade 8 steel yellow, 9/16"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
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$0.51 each
$7.04 / 25
$62.70 / 250
3065
USS flat washers, Zinc plated grade 8 steel yellow, 9/16"
USS pattern is the most common type of flat washer.
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$0.43 each
$8.30 / 25
$70.20 / 250
3042
Lock washers, Zinc plated grade 8 steel yellow, 9/16"
Split lock washers place tension against a nut after tightening, to help prevent loosening.
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$0.18 each
$3.24 / 25
$29.10 / 250

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.