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China Spring Washers | Split Lock Washers & Helical Spring Washers from Reliable Suppliers & Factory
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
Helical shape creates spring tension for anti-loosening
Maintains preload in bolted joints under dynamic conditions
Designed to bite into bearing surface and mating fastener
Suitable for medium-duty locking performance
Easy to install and compatible with standard bolts/nuts
Available in light, medium, and heavy series
Applications
Automotive
Automotive and machinery assembly
Electrical
Electrical equipment and appliances
Industrial
Industrial machines and tools
Construction
Construction and steel structure connections
Renewable
Renewable energy and wind power installations
Other
Vibration-prone equipment and bolted assemblies
Packaging & Delivery
| Packaging |
Bulk in cartons and wooden pallets Small boxes, plastic bags, or customized packaging |
| Lead Time | 7–30 days based on quantity and order specs |
| Shipping Port | Tianjin Port, China |
Why Choose Hebei Chudu
- Over a decade of expertise in washer and fastener production
- Strict quality control with ISO 9001 certification
- Full product range: spring, flat, fender, sealing, and custom washers
- Fast response, stable supply, and competitive pricing
- OEM/ODM supported with custom materials and surface treatments
- Export experience with customers in 40+ countries
Frequently Asked Questions
What standards do your carriage bolts comply with?
Our carriage bolts are manufactured according to DIN 603, ASME B18.5, and ISO 8677 standards. Custom specifications are also available upon request.
What materials and grades do you offer for fasteners?
We supply products in Carbon Steel, Stainless Steel (SS304, SS316), and Alloy Steel, with grades ranging from 4.8, 6.8, 8.8, 10.9, to A2-70 and A4-80.
What is your typical lead time and shipping port?
Our standard lead time is 7 to 30 days, depending on the order size and specifications. All shipments are processed through Tianjin Port, China.
Do you support OEM/ODM and customized packaging?
Yes, we fully support OEM and ODM orders. We offer custom materials, surface treatments, and packaging options such as bulk cartons, wooden pallets, small boxes, or plastic bags.
What are the primary features of your spring washers?
Our helical spring washers feature a helical shape that creates spring tension for anti-loosening, maintains preload under dynamic conditions, and is designed to bite into bearing surfaces to prevent shifting.