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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
SAE flat washers, Chrome plated steel, 5/8"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
$1.81 / ea
$15.83 / 10
$146.00 / 100
Lock washers, Chrome plated steel, 5/8"
Split lock washers place tension against a nut after tightening, to help prevent loosening.
$3.87 / ea
$30.92 / 10
$142.00 / 50

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.