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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
15029
SAE flat washers, Zinc plated grade 5 steel, 1/4"
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
$0.07 / ea
$4.81 / 100
$41.40 / 1,000
15021
USS flat washers, Zinc plated grade 5 steel, 1/4"
USS pattern is the most common type of flat washer.
$0.08 / ea
$5.66 / 100
$51.00 / 1,000

See also

Metric full thread tap bolt

Metric tap bolts

A full thread bolt with a six sided head.