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

Tap bolt diameter

Resources

Diameter and Thread count

Matching Products

Click on a product # for additional info

Prod. # Description Buy
15030
SAE flat washers, Zinc plated grade 5 steel, 5/16"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
$0.09 / ea
$5.85 / 100
$50.30 / 1,000
15022
USS flat washers, Zinc plated grade 5 steel, 5/16"
USS pattern is the most common type of flat washer.
$0.13 / ea
$8.75 / 100
$78.80 / 1,000

See also

Metric full thread tap bolt

Metric tap bolts

A full thread bolt with a six sided head.