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

Hex bolt diameter

Diameter and Thread count

Matching Products

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Prod. # Description Buy
18734
SAE flat washers, Chrome plated steel, 5/8"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
This product is

Unfortunately this product is not currently available for purchase due to limited supply or other problems.

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18741
Lock washers, Chrome plated steel, 5/8"
Split lock washers place tension against a nut after tightening, to help prevent loosening.
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$3.87 / ea
$30.92 / 10
$138.00 / 50

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.