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 | A2 A4 cross recessed hex head screw ，metal sems screw with washer ，DIN9021 assembled screw with warranty | ||
Product Description
This SEMS screw has a hex head with an additional cross recess (dual drive) and comes with a DIN9021 large diameter flat washer pre‑assembled. The large washer provides a much bigger bearing surface than standard washers, making it perfect for soft materials or thin sheet metal with oversized holes. The screw is made of A2 (304) or A4 (316) stainless steel, strength classes 70 or 80. “All sizes" means diameters from M3 up to M12 can be supplied. The dual drive (hex + cross) allows installation with a wrench or a screwdriver – a useful feature for maintenance.
| 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 |
Plastic and composite enclosures: large washer prevents embedment and cracking.
Solar PV module frames: even load distribution on aluminium profiles.
Home appliances: washing machine bases, refrigerator back panels.
Curtain walls and aluminium composite panels: outdoor use with A4 stainless.
Display racks and retail fixtures: easy installation with common tools.
Extra‑large washer (DIN9021) – protects soft substrates (plastic, aluminium, wood).
Dual drive (hex + cross) – use a wrench for high torque or a screwdriver for speed.
All sizes coverage – one supplier for the whole range.
Stainless steel durability – A2 for inland, A4 for coastal/chemical environments.
DIN9021 standard – ensures consistent washer dimensions and fit.
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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