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
15035
SAE flat washers, Zinc plated grade 5 steel, 5/8"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
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$0.49 / ea
$7.74 / 25
$68.90 / 250
15027
USS flat washers, Zinc plated grade 5 steel, 5/8"
USS pattern is the most common type of flat washer.
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$0.61 / ea
$11.98 / 25
$105.00 / 250

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.