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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
2949
$0.12 / ea
$8.15 / 100
$65.20 / 1,000
2958
Lock washers, Stainless steel 18-8, 3/8"
Split lock washers place tension against a nut after tightening, to help prevent loosening.
$0.15 / ea
$8.94 / 100
$78.40 / 1,000

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.