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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
15034
SAE flat washers, Zinc plated grade 5 steel, 9/16"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
$0.77 / ea
$12.82 / 25
$110.00 / 250
15026
USS flat washers, Zinc plated grade 5 steel, 9/16"
USS pattern is the most common type of flat washer.
$0.94 / ea
$15.69 / 25
$141.00 / 250

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.