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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
2998
USS flat washers, Zinc plated steel, 1/2"
USS pattern is the most common type of flat washer.
$0.18 / ea
$12.17 / 100
$103.00 / 1,000
3028
Lock washers, Zinc plated steel, 1/2"
Split lock washers place tension against a nut after tightening, to help prevent loosening.
$0.10 / ea
$6.66 / 100
$56.50 / 1,000