Hunan Jia Shan Hardware Tech Co., Ltd.
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| Attribute | Value |
|---|---|
| Name | Metal Screw |
| Standard | DIN, ASME, ANSI, ISO |
| Material | Steel, Stainless steel, Brass, Copper, Titanium Alloy, Plastic |
| Place of Origin | China |
| Finish | Polish, Passivation, Black, Galvanization, Chromate, Dacromet |
| Certificate | ISO9001:2008, ROHS |
| Used | Building Industry Machinery |
| Thread Type | Coarse, Fine |
| Usage | Fastening |
| Function | Connection, Fastening and Decoration |
| Strength | High |
| Size | Various sizes available |
| Measurement System | INCH, Metric system |
Carbon Steel Class 4.8 8.8 Black Oxide Cross Recessed Flat Black Drywall Screw
The performance grades of bolts used for steel structure connections range from 3.6 to 12.9, with grade 8.8 and above classified as high-strength bolts made from low-carbon alloy steel or medium carbon steel with heat treatment (quenching, tempering). Grade 4.8 bolts are typically made from 45 steel or Q235-A materials.
The performance grade label consists of two numbers representing the nominal tensile strength value and the yield ratio of the bolt material respectively.
| Industry | Use Case |
|---|---|
| Automotive | High-strength applications including engines, heavy-duty machinery, and bridge construction |
| Mechanical | Connecting mechanical parts, circuit boards, engines, transmissions, and building structures |
| Energy | Connecting power generation equipment and transmission lines |
| Architectural | Building structures, shipbuilding, and petrochemical equipment |
| Material | Characteristics |
|---|---|
| Aluminum | Excellent thermal/electrical conductivity but soft; requires proper processing |
| Titanium | Requires EDM machining with deionized water medium |
| Steel | Very strong; generates heat during processing |
| Brass | High tensile strength but requires slow cutting speed |
Performance grade 8.8 high-strength bolts achieve:
