Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of 8.8 grade black hex socket self-tapping screw high strength carbon steel in China. Welcome to buy bulk high quality 8.8 grade black hex socket self-tapping screw high strength carbon steel made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
【Product Overview】
The Grade 8.8 High Strength Carbon Steel Hex Socket Head Cap Self Tapping Screw is a premium fastening solution engineered for demanding applications where strength, reliability, and efficiency are critical. Featuring a black oxide finish, cylindrical head design, and hex socket drive, this screw delivers exceptional performance across metal, wood, and composite materials.
Whether you're in machinery assembly, furniture manufacturing, automotive production, or construction, this self tapping screw eliminates the need for pretapped holes while providing the tensile strength of a Grade 8.8 fastener.
Key Features & Benefits
| Parameter | Specification |
|---|---|
| Material | Medium Carbon Steel |
| Strength Grade | Class 8.8 |
| Tensile Strength | ≥ 800 MPa |
| Yield Strength | ≥ 640 MPa |
| Head Type | Socket Head Cap |
| Drive Type | Hexagon Socket (Allen) |
| Finish | Black Oxide |
| Thread Type | Self-Tapping (full /half thread) |
| Available Diameters | M2 – M24 |
| Available Lengths | Custom (up to 150mm) |
【Solving Your Pain Points】
❌ Pain Point: TimeConsuming Installation
Traditional fasteners require predrilled and pretapped holes, adding extra production steps and labor costs.
✅ Our Solution: Self-tapping design eliminates pre tapping simply drill a pilot hole and drive the screw in. Installation time reduced by up to 60%.
❌ Pain Point: Corrosion & Rust in Harsh Environments
Standard steel screws rust quickly in humid or outdoor conditions, compromising joint integrity.
✅ Our Solution: Black oxide coating provides mild corrosion resistance and a protective layer against wear and abrasion, extending service life in demanding environment.
❌ Pain Point: Cross Threading & Thread Damage
Misaligned threads during installation can damage the workpiece and ruin the fastener.
✅ Our Solution: Precision engineered self tapping threads cut cleanly into the material, reducing cross threading risk and ensuring a secure, reliable connection every time.
Why Choose Us:
Our manufacturing facility spans 12,000 square meters and operates 8 high-speed cold heading production lines, 6 automatic thread rolling machines, and 4 advanced heat treatment lines, supported by a dedicated in-house laboratory for material and coating testing. With an annual output exceeding 8,000 tons, we maintain consistent inventory and short lead times.
【Applications】
Industrial Machinery: equipment assembly, machine frames
Automotive:components, panels, structural assemblies
Furniture Manufacturing: heavyduty furniture, cabinetry
Construction: structural fastening, building components
Customization & Service
We understand that every project has unique requirements. That's why we offer comprehensive OEM & ODM customization services to meet your specific needs
| Customization Option | Details |
|---|---|
| Dimensions | Custom diameters, lengths, and thread sizes available |
| Materials | Carbon steel, stainless steel, brass |
| Strength Grades | 4.8, 8.8, 10.9, 12.9 |
| Surface Finishes | Black oxide, zinc-plated (various colors), nickel-plated, chrome-plated, Dacromet |
| Head Types | Cylindrical/button/pan/flat/countersunk heads |
| Drive Styles | Hex socket, Phillips, Torx, slotted |
| Standards | DIN, ANSI, ASTM, ISO, GB, JIS, or non-standard |
| Packaging | Plastic bags, boxes, cartons, pallets, or custom packaging |
FAQ
Q: What international shipping options are available?
A: We support sea freight, air freight, and express couriers (DHL, FedEx, UPS). Shipping terms include FOB, CIF, and EXW.
Q: What payment methods do you accept?
A: We accept T/T (bank transfer), L/C at sight, and secure online payment platforms. Flexible terms are available for long-term partnerships.
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