Carriage Bolts

carriage bolt manufacturers | Webber Crimpex

Product Dimensions

Parameter	Specification
Product Type	Carriage Bolt / Coach Bolt
Size Range	M6 – M20 (custom sizes available)
Material Options	Stainless Steel, Mild Steel, Carbon Steel, Alloy Steel
Standards	DIN 603, ISO, BS, ASTM
Surface Finish	Zinc Plated, Hot-dip Galvanized, Nickel Plated, Black Oxide

Industrial Applications

Electrical Panels and Assemblies: As trusted carriage bolt manufacturers, our bolts are recognised for their smooth, tamper-resistant head, making them perfect for installing electrical fittings and panel assemblies.
Automotive Industry: Our heavy-duty carriage bolts are specifically designed to withstand vibration and provide strong fastening in chassis, body panels and vehicle frames.
Construction and Woodworking: Precision carriage bolts manufacturer standards guarantee that each bolt can be used in timber connections, joists and heavy-duty wooden structures.
Furniture Manufacturing: Carriage bolts offer a clean, professional look at joints and they are strong and reliable.
Railway, Marine and Heavy Equipment : Our durable fastening bolts are engineered for the most challenging conditions, providing you with the strength and reliability needed for your outdoor and load-bearing projects.
Secure Assembly: Our secure assembly bolts are the preferred choice in the railway, marine and heavy equipment industries where performance and durability are of paramount importance.

Product Description

Secure Assembly Carriage Bolts are manufactured with a square neck under the dome head to prevent torque rotation when the bolt is tightened in a pre-drilled hole. This feature enables the secure attachment of the tool without the need for a holding tool on the head side. Commonly paired with flat washers and nuts, our bolts are favoured in woodworking, construction and structural applications due to their high strength and tidy appearance. They come in multiple lengths, diameters and finishes and can be used indoors or out, even in corrosive environments.

Product specifications

Head Type: Dome-shaped round head with square neck underhead
Thread Type: Metric ISO coarse thread (standard); UNC/UNF on request
Size Range: M6 – M20; lengths from 20 mm up to 300 mm (custom options available)
Material Options: Stainless steel (304/316), mild steel, carbon steel, alloy steel
Surface Finish: Zinc plated, hot-dip galvanized, nickel plated, black oxide, polished stainless steel
Square Neck Dimension: Proportional to bolt diameter, prevents rotation during tightening
Tensile Strength: Up to 800–1000 MPa depending on grade and material
Shear Strength: ~60% of tensile strength (material-dependent)
Corrosion Resistance: Excellent when galvanized or in stainless steel grades
Operating Temperature: -40°C to +300°C depending on material and coating
Applications: Timber joints, structural frames, machinery, railways, automotive, marine, and furniture
Standards/Compliance: DIN 603, ISO 8677, BS 4933, ASTM standards
RoHS/REACH Compliance: Available as per material and finish requirements