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 | SEMS SCREW |
| 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 | customized |
| 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 | SEMS SCREW | 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 | customized |
| Brand Name | JIASHAN | Certification | ISO 9001 |
| Place of Origin | china | ||
| High Light | Cross recessed pan head metal screws ，Serrated lock washers external teeth ，DIN6907 metal screws with washers | ||
This specialised SEMS screw features an external teeth lock washer (serrated washer) pre‑assembled under a cross recessed pan head, conforming to DIN6907. The radial teeth on the washer bite into both the screw head underside and the workpiece surface, creating a positive mechanical lock that resists loosening under severe vibration. Unlike ordinary spring washers, the external teeth provide a strong anti‑rotation effect without damaging the screw head finish. The screw body can be carbon steel or stainless steel, with zinc plating or plain finish as required. This design is ideal for applications where chemical threadlockers are not allowed.
| 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 |
Agricultural machinery: harvesters, tillers – high vibration environments.
Industrial washing machines and centrifuges: door hinges and covers.
Generator sets and air compressors: base mounting screws.
Rail vehicle interior fittings: seats, luggage racks.
Construction machinery: tower crane platform connections.
Positive mechanical locking – teeth embed into the workpiece, far better than friction‑based spring washers.
No extra parts – one component combines screw and lock washer.
Reusable (limited cycles) – retains some anti‑loosening ability after disassembly.
Minimal surface marking compared to internal teeth washers.
DIN6907 standard ensures reliable dimensions and performance.
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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