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China Carriage Bolts Factory | Reliable Suppliers of Round Head Square Neck Fasteners
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
Q1: What manufacturing standards do your carriage bolts follow?
Our carriage bolts are manufactured in strict accordance with international standards including DIN 603, ASME B18.5, and ISO 8677. Custom standard specifications can also be accommodated based on your requirements.
Q2: What materials and grades are available for carriage bolts?
We supply carriage bolts in Carbon Steel, Stainless Steel (SS304, SS316), and Alloy Steel. Available strength grades include 4.8, 6.8, 8.8, 10.9, as well as A2-70 and A4-80 for stainless steel options.
Q3: How does the square neck design under the round head function?
The square neck is designed to lock into a pre-drilled square hole (especially in wood or metal joints). This prevents the bolt from rotating or turning when the nut is being tightened from the opposite side, allowing single-tool installation.
Q4: What surface treatment options do you provide for corrosion resistance?
We offer various coatings including Zinc Plated (Blue/Yellow), Hot Dip Galvanized (HDG) for outdoor heavy-duty use, Black Oxide, Dacromet/Ruspert, and Plain/Oiled finishes to prevent rust and corrosion.
Q5: 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 volume and specific customizations. All shipments are dispatched directly from the port of Tianjin, China.
Q6: Do you support customized packaging and private labeling?
Yes, we provide bulk packaging in cartons on pallets as standard, but we also offer small boxes, color boxes, and customized labels featuring your own logo and branding.