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

Important Note: Due to the plating thickness, only hot dipped galvanized nuts should be used on hot dipped galvanized hex bolts.

Hex bolt diameter

Diameter and Thread count

Matching Products

Click on a product # for additional info

Prod. # Description Buy
2991
USS flat washers, Hot dipped galvanized steel, 5/8"
USS pattern is the most common type of flat washer.
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$0.35 each
$14.18 / 50
$125.00 / 500
2985
Lock washers, Hot dipped galvanized steel, 5/8"
Split lock washers place tension against a nut after tightening, to help prevent loosening.
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$0.26 each
$8.45 / 50
$75.60 / 500

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.