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

Carriage bolt diameter

Diameter and Thread count

Matching Products

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Prod. # Description Buy
3493
Flat washers, Silicon bronze, 3/8"
General use flat washer
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$0.80 / ea
$12.93 / 25
$119.00 / 250
3502
Lock washers, Silicon bronze, 3/8"
Split lock washers place tension against a nut after tightening, to help prevent loosening.
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$0.40 / ea
$6.31 / 25
$57.70 / 250