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Carriage Bolts

Auto Bolt manufactures carriage bolts to the customer’s print or specification, with a minimum order quantity of 2,500 pieces. Special dimensions, such as head heights, head types, and thread lengths, can be produced. Configurations are available in either inch or metric sizes. Special tooling can be created to produce nonstandard headmarks.

Size Ranges

Diameters: 1/4" – 1"
Lengths: 3/8" – 11 3/4"

Diameters: M6 – M24

Standard Materials

Carbon Steels: SAE 1008, 1010, 1018, 1038, 1541, and 10B21
Alloy Steels: SAE 1335, 4037, 4140, 5140, 8620, 8637, and 8740
Stainless Steels: 302, 304


Zinc, zinc yellow, phos & oil, black oxide, cadmium, and organics. Other coatings on request.


Auto Bolt manufactures certified quality products using industry standards such as ASTM, ASME, ANSI, SAE, ISO, and DIN.

carriage bolts
carriage bolts
carriage bolts
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