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Carriage bolts are divided into large semicircular head carriage bolts (corresponding to standard GB/T14 and DIN603) and small semicircular head carriage bolts (corresponding to standard GB/T12-85) according to the head size. Carriage bolt, a type of fastener consisting of a head and a screw ,used in conjunction with a nut for fastening two parts with through-holes.

Performance grade: carbon steel: grade 4.8/8.8/10.9/12.9, stainless steel A2-50/A4-70/80, etc.

Surface treatment:carbon steel surface treatment is generally boiled black, galvanized, non electrolytic zinc sheet coating, thick galvanized vzd and thick galvanized
Zinc plus sealing (zsml), zinc nickel coating silver (znshl), zinc nickel coating black (zhbh)

Carriage Bolts

Carriage bolts are widely used to fasten equipment, machinery, and structures, including heavy-duty components like pipelines, tanks, and drilling rigs. Designed to endure high stress and pressure, they’re typically crafted from durable materials like stainless steel or titanium to endure harsh conditions.

November 21, 2025
Zhuocheng Carriage bolt In Various Lengths And Diameters With Zinc Plated Finish

Carriage bolts are divided into large semicircular head carriage bolts (corresponding to standard GB/T14 and DIN603) and small semicircular head carriage bolts (corresponding to standard GB/T12-85) according to the head size. Carriage bolt, a type of fastener consisting of a head and a screw ,used in conjunction with a nut for fastening two parts with through-holes.

March 16, 2022
Carbon Steel Grade 8.8 10.9 Carriage Bolt Black

A carriage bolt (also called coach bolt and round-head square-neck bolt)[1] is a form of bolt used to fasten metal to metal or, more commonly, wood to metal. Also known as a cup head bolt in Australia and New Zealand.It is distinguished from other bolts by its shallow mushroom head and the fact that the cross-section of the shank, though circular for most of its length (as in other kinds of bolt), is square immediately beneath the head.[2] This makes the bolt self-locking when it is placed through a square hole in a metal strap. This allows the fastener to be installed with only one wrench, working from the opposite end. The head of a carriage bolt usually is a shallow dome. The shank has no threads; and its diameter equals the side of the square cross-section.The carriage bolt was devised for use through an iron strengthening plate on either side of a wooden beam, the squared part of the bolt fitting into a square hole in the ironwork. It is common to use a carriage bolt on bare timber, the square section giving enough grip to prevent rotation.The carriage bolt is used extensively in security applications, such as locks and hinges, where the bolt must be removable from one side only. The smooth, domed head and square nut below prevent the carriage bolt from being gripped and rotated from the insecure side.

March 16, 2022
Hot Dipped Galvanised HDG Cup Head Carriage Bolt | Coach Bolt

Carriage bolts are divided into large semicircular head carriage bolts (corresponding to standard GB/T14 and DIN603) and small semicircular head carriage bolts (corresponding to standard GB/T12-85) according to the head size. Carriage bolt, a type of fastener consisting of a head and a screw ,used in conjunction with a nut for fastening two parts with through-holes.

March 16, 2022
Customized stainless steel SS304 SS316 carbon steel blue white color yellow black zinc plated carriage bolt

Carriage bolts are divided into large semicircular head carriage bolts (corresponding to standard GB/T14 and DIN603) and small semicircular head carriage bolts (corresponding to standard GB/T12-85) according to the head size. Carriage bolt, a type of fastener consisting of a head and a screw ,used in conjunction with a nut for fastening two parts with through-holes.

March 16, 2022