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.

Product Description:


Standard: ANSI/ASME B18.5/ DIN603

GRADE: A307,GR A,Gr2.

Material: carbon steel,Q195,A36

Size:from 1/4” to 1”, from 6mm to 24mm.

Surface finish:zinc plated, plain, black oxide, HDG

Packing: cartons with plywood pallet

Supply ability: 200tons per month

Assembly: normally with hex flange nut, with or without serration.