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Carriage Bolts

Carriage bolts (round head with square neck) are commonly used in wood connections. The square neck under the round head will seat into the hole in the wood to prevent the head from turning. Because they are used with wood, carriage bolts are rarely high strength and virtually always supplied in a standard ASTM A307 specification.

MANUFACTURING

Portland Bolt manufactures carriage bolts from 1/2” diameter through 1-1/4” diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions, carriage bolts larger than 1” in diameter, or bolt heads with your company’s name and/or logo.

STANDARD THREAD LENGTH

Bolt lengths ≤ 6”: Thread length = (2 X diameter) + 1/4”
Bolt lengths > 6”: Thread length = (2 X diameter) + 1/2”

Note: Most stock stock carriage bolts have extended thread length.

STOCK

Diameters: 3/8” – 3/4"
Lengths: 18” maximum Origin: Import
Finish: Black and hot-dip galvanized

Bolt Diameter D C H F P
Body Diameter Head
Diameter		 Head
Height		 Square
Width		 Square
Depth
Max Min Max Min Max Min Max Min Max Min
3/8 0.388 0.360 0.844 0.782 0.208 0.188 0.388 0.368 0.219 0.188
1/2 0.515 0.483 1.094 1.032 0.270 0.250 0.515 0.492 0.281 0.250
5/8 0.642 0.605 1.344 1.219 0.344 0.313 0.642 0.616 0.344 0.313
3/4 0.768 0.729 1.594 1.469 0.406 0.375 0.768 0.741 0.406 0.375
7/8 0.895 0.852 1.844 1.719 0.469 0.438 0.895 0.865 0.469 0.438
1 1.022 0.976 2.094 1.969 0.531 0.500 1.022 0.990 0.531 0.500
1-1/4* 1.277   2.850   0.531 0.500 1.250   0.625  

*Dimensions per ASME B18.5 1990 (R 1998) cover diameters up to 1". Bolts over 1" use custom head dimensions.