Hunan Jia Shan Hardware Tech Co., Ltd.
| Payment Terms | L/C, D/A, D/P, T/T |
| Supply Ability | 10000,Piece/Pieces,Month |
| Delivery Time | about 12-18days |
| Packaging Details | Plastic Bag+Chipboard Carton+Plywood Pallet Pallet with Belt&Plastic Film. |
| Product name | Metal Bolt |
| Service | OEM |
| Corrosion Resistance | Yes |
| Port | Shenzhen, Guangzhou |
| Corrosionresistance | High |
| Thread Type | Standard/Customization |
| Package | Plastic Bag+Chipboard Carton+Plywood Pallet Pallet with Belt&Plastic Film. |
| Finish | plain |
| Head Type | Round |
| Color | Sliver |
| Brand Name | JIASHAN |
| Certification | ISO 9001 |
| Place of Origin | china |
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Product Specification
| Payment Terms | L/C, D/A, D/P, T/T | Supply Ability | 10000,Piece/Pieces,Month |
| Delivery Time | about 12-18days | Packaging Details | Plastic Bag+Chipboard Carton+Plywood Pallet Pallet with Belt&Plastic Film. |
| Product name | Metal Bolt | Service | OEM |
| Corrosion Resistance | Yes | Port | Shenzhen, Guangzhou |
| Corrosionresistance | High | Thread Type | Standard/Customization |
| Package | Plastic Bag+Chipboard Carton+Plywood Pallet Pallet with Belt&Plastic Film. | Finish | plain |
| Head Type | Round | Color | Sliver |
| Brand Name | JIASHAN | Certification | ISO 9001 |
| Place of Origin | china | ||
| High Light | Zinc Blue M12 carriage bolt ，Grade 8.8 metal bolt ，DIN603 round head bolt | ||
Zinc Blue M12 1045 Gr.8.8 METAL BOLT Carriage Bolt Large Round Head DIN603
Product Description
Carriage Bolt is produced from round wire or hot-rolled rod in a multi-station cold- or hot-forging process. A shallow, large-diameter dome head is formed first; immediately after, a square or short ribbed neck is extruded just under the head. The square section is slightly wider than the thread root diameter, so it bites into the wood or into a square punched hole when the bolt is driven in. After head and neck forming, the blank is thread-rolled between flat dies to generate a Class 6g (metric) or 2A (inch) thread with a smooth, work-hardened surface that gives 25-30 % higher fatigue strength than cut threads. Heat-treatment follows when mechanical properties above 400 MPa are required: medium-carbon grades are quenched and tempered at 550 °C to achieve Grade 8.8 or A307-C strength, while stainless steels are solution-annealed at 1050 °C and water-quenched to restore corrosion resistance. Final finishing is selected for the target environment: zinc electroplating (5–8 µm) or hot-dip galvanizing (45–60 µm) for carbon steel outdoor use, black oxide plus oil for indoor furniture, Dacromet or Geomet for 1000-hour salt-spray demand, and passivation or electropolishing for stainless A2-70/A4-80 bolts used in food equipment. The entire process is governed by DIN 603, ISO 8678, ASME B18.5 and EN 14399-7 dimensional standards, so every Carriage Bolt delivers consistent head height, square width across flats, and thread fit for automatic assembly lines.
| Industry | Usage |
|---|---|
| Automotive | High-strength applications in engines, heavy-duty machinery, and bridge construction |
| Mechanical | Connecting mechanical parts, circuit boards, engines, transmissions in various industries |
| Energy | Connecting power generation equipment and transmission lines |
| Architectural |
Building structures, shipbuilding, and petrochemical equipment |
Secures wooden sleepers to steel bridge beams; the large head distributes clamp force, preventing timber crushing under 40-ton loads.
Key Features
Yellow finish signals high-strength grade to site inspectors; square neck stops spin-out when vibrating pneumatic wrenches are used upside-down.
Company Details
Business Type:
Manufacturer,Exporter,Seller
Year Established:
2007
Total Annual:
15000000-20000000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Hunan Jiashan Hardware Tech as a branch company of J AND R METALWORK,established in 2007 and located in Changsha, Hunan, China.After almost 17 years management development and technical improvement, Jiashan is willing to be a leading supplier in hardware industry. Meanwhile, we are one of member of ... Hunan Jiashan Hardware Tech as a branch company of J AND R METALWORK,established in 2007 and located in Changsha, Hunan, China.After almost 17 years management development and technical improvement, Jiashan is willing to be a leading supplier in hardware industry. Meanwhile, we are one of member of ...
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