Carriage Bolts (also known as coach bolts) feature a rounded, domed head with a square neck beneath to prevent rotation during installation. Ideal for wood-to-metal or metal-to-metal connections, they are manufactured from carbon steel (Grade 4.8/8.8), stainless steel (304/316), or galvanized steel for corrosion resistance.
- Material:
- Carbon Steel (zinc-plated, yellow/clear).
- Stainless Steel (304/316 for outdoor/marine use).
- Alloy Steel (Grade 10.9 for high-tensile applications).
- Size Range:
- Diameter: M6–M30 (metric) / 1/4"–1-1/4" (imperial).
- Length: 10–300 mm (custom lengths available).
- Design:
- Domed Head: Smooth, rounded top for aesthetics and safety.
- Square Neck: Prevents turning when tightening nuts.
- Thread Type: Full or partial threads (UNC/UNF or metric).
- Standard Carbon Steel/Zinc-Plated: 1,000 pieces (in-stock sizes).
- Stainless Steel/Custom Designs: 2,000 pieces (small-batch sampling available).
Factory Advantages: ISO-certified production, material test reports, support for custom lengths, special coatings (e.g., Dacromet, black oxide), and bulk orders with lead times of 10–20 days.
- Woodworking: Furniture assembly, decking, and timber framing.
- Metal Fabrication: Machinery mounts, trailer frames, and structural connections.
- Outdoor Structures: Fences, playground equipment, and agricultural machinery.
- Automotive: Chassis components, engine mounts, and truck beds.
- Corrosion Resistance:
- Zinc plating (500+ hours salt spray) for general use.
- 316 stainless steel (1,000+ hours salt spray) for coastal/marine environments.
- Torque Resistance: Square neck design ensures secure tightening without head rotation.
- Safety: Smooth heads reduce risk of injury in exposed applications.
- Non-Standard Sizes: Custom diameters, lengths, or square neck dimensions.
- Special Coatings: PTFE (anti-seize), epoxy (color-matched), or hot-dip galvanized.
- Head Markings: Laser-engraved logos or part numbers for branding.
Contact Us
Request a quote for your carriage bolt needs! Factory-direct pricing and global shipping for industrial, construction, and DIY projects.
JH Bolt Co., Ltd is a professional manufacturer of different types of bolts with more than 15 years rich manufacturer experience. The factory area is more than 1500 squares with more than hundreds different types ofnevproduction machines. There are more than 50 people who work here for at least 5 years.With quality &customer frst, staffs second, then company, Our products are widely recog-nized and trusted by users all over the world. Proft for the development of communication, We are here for you 12 hours a day, 7 days a week!
