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China Carriage Bolts Supplier | Round Head Square Neck Bolts from Leading Factory - Hebei Chudu Metal Products Co., Ltd
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 standards do your carriage bolts comply with?
Our carriage bolts are manufactured in strict compliance with international standards including DIN 603, ASME B18.5, and ISO 8677. We can also customize the bolts to meet your specific project requirements.
What materials and grades of carriage bolts do you offer?
We supply carriage bolts in Carbon Steel, Stainless Steel (SS304, SS316), and Alloy Steel. The available strength grades range from 4.8, 6.8, 8.8, and 10.9 to stainless steel grades A2-70 and A4-80.
What is the function of the square neck on a carriage bolt?
The square neck underneath the smooth, round dome head is designed to grip into the material (especially wood or pre-punched metal holes) to prevent the bolt from turning when the nut is being tightened.
What surface treatments are available for corrosion resistance?
To guarantee long-term durability in various environments, we provide multiple surface finishes including Zinc Plated (Blue/Yellow), Hot Dip Galvanized (HDG), Black Oxide, Dacromet, Ruspert, and Plain/Oiled options.
What are your packaging options and delivery lead times?
We offer bulk packaging in cartons on pallets, as well as small boxes, color boxes, and customized labeling with your logo. The typical lead time ranges from 7 to 30 days, depending on your order quantity and specific requirements.
Why should we choose Hebei Chudu as our supplier?
Hebei Chudu offers factory-direct supply with competitive pricing, a complete production line with strict ISO 9001 quality control (SGS/ROHS compliant), flexible order quantities, OEM/ODM services, and a professional foreign trade team to ensure smooth communication.