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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
15031
SAE flat washers, Zinc plated grade 5 steel, 3/8"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
$0.17 / ea
$11.09 / 100
$95.40 / 1,000
15023
USS flat washers, Zinc plated grade 5 steel, 3/8"
USS pattern is the most common type of flat washer.
$0.20 / ea
$13.49 / 100
$121.00 / 1,000

See also

Metric hex bolt

Metric hex bolts

A bolt with a six sided head.