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China Carriage Bolts | Round Head Square Neck Bolts Manufacturer, Suppliers & Factory with 10 Years Experience
Product Overview
| Product Name | Carriage Bolt (Round Head Square Neck Bolt) |
| Standards | DIN 603, ASME B18.5, ISO 8677, or customized |
| Material | Carbon Steel, Stainless Steel (SS304, SS316), Alloy Steel |
| Grade | 4.8, 6.8, 8.8, 10.9, A2-70, A4-80 |
| Surface Finish | Zinc Plated (Blue / Yellow) |
| Hot Dip Galvanized (HDG) | |
| Black Oxide | |
| Dacromet / Ruspert | |
| Plain / Oiled | |
| Thread Type | Full Thread / Partial Thread, Metric / UNC / UNF |
| Size Range | Metric: M5 – M24, Length 10mm – 300mm |
| Inch: 1/4" – 1", Length 3/4" – 12" | |
| Customized sizes available |
Product Features
-
Round, dome-shaped head for smooth surface and safe use -
Square neck design prevents bolt from turning during tightening -
Excellent corrosion resistance for indoor and outdoor applications -
Strong holding power for heavy-duty assemblies -
Easy to install with a single tool from the nut side
Applications
Wood-to-wood and wood-to-metal joints
Fencing, decking, and outdoor wooden structures
Construction and building projects
Machinery and equipment fastening
Automotive and agricultural industries
Bridges, railways, and public infrastructure
Packaging & Delivery
| Packaging | Bulk in cartons + pallets |
| Small boxes, color boxes, customized labels with logo | |
| Lead Time | 7–30 days depending on quantity and specifications |
| Shipping Port | Tianjin, China |
Why Choose Hebei Chudu
Factory-direct supply with competitive prices.
Full production line and stable quality control.
Fast delivery and flexible order quantities.
OEM / ODM services for custom needs.
Certified by ISO 9001 with SGS and ROHS compliance.
Professional foreign trade team with efficient communication.
Frequently Asked Questions
What are the main standards of carriage bolts you supply?
We supply carriage bolts conforming to major international standards including DIN 603, ASME B18.5, and ISO 8677. Custom specifications can also be manufactured according to your requirements.
What materials and grades are available for your carriage bolts?
Our carriage bolts are available in Carbon Steel, Stainless Steel (SS304, SS316), and Alloy Steel. We offer grades 4.8, 6.8, 8.8, 10.9, A2-70, and A4-80.
Why does a carriage bolt have a square neck?
The square neck underneath the smooth round head is designed to lock into the material (especially wood or pre-punched metal holes) during installation. This prevents the bolt from rotating when the nut is being tightened.
What surface finishes do you provide for corrosion protection?
We offer a wide range of surface treatments including Zinc Plated (Blue/Yellow), Hot Dip Galvanized (HDG), Black Oxide, Dacromet, Ruspert, and Plain/Oiled finishes to ensure long-term corrosion resistance.
What is the typical lead time and shipping port for orders?
Our standard lead time ranges from 7 to 30 days depending on the order size and customization requirements. All orders are shipped via Tianjin Port, China.
Do you offer OEM/ODM and customized packaging services?
Yes, Hebei Chudu provides complete OEM/ODM services for customized sizes, materials, and designs. We also support custom packaging options including small boxes, color boxes, and customized labels with your logo.