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

Carriage bolt diameter

Resources

Diameter and Thread count

Matching Products

Click on a product # for additional info

Prod. # Description Buy
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