Product Details
Product Description
China factory direct supply black oxide flat head socket cap screws grade 10.9 for wholesale. These high-strength screws feature a flat head design for flush mounting, internal hex drive for precise torque control, and full threading for maximum fastening versatility. The black oxide finish provides basic corrosion resistance and a clean appearance. Grade 10.9 offers superior tensile strength for demanding applications. Perfect for machinery, automotive, and precision equipment manufacturing. Bulk discounts available for distributors and OEM customers.
Technical Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Standard | ISO 10642, DIN 7991 | Head Type | Flat Head (Countersunk) |
| Drive Type | Hex Socket | Thread Type | Full Thread |
| Property Class | 10.9 | Finish | Black Oxide |
| Material | Alloy Steel | Tensile Strength | 1040 MPa |
| Yield Strength | 940 MPa | Hardness | 32-39 HRC |
| Corrosion Resistance | Basic protection | Temperature Range | Up to 200°C |
Popular Sizes of Black Oxide Countersunk Screws
| Size (Metric) | Thread Pitch (Standard) | Head Diameter (A) | Head Height (K) | Socket Size (S) | Shoulder Length (d1) | Theoretical Head Weight (g) ≈ |
|---|---|---|---|---|---|---|
| M4 | 0.7 | 8.0 mm | 2.6 mm | 2.5 mm | 4.3 mm | 0.45 |
| M5 | 0.8 | 9.5 mm | 3.1 mm | 3.0 mm | 5.3 mm | 0.80 |
| M6 | 1.0 | 11.5 mm | 3.6 mm | 4.0 mm | 6.4 mm | 1.42 |
| M8 | 1.25 | 15.0 mm | 4.8 mm | 5.0 mm | 8.4 mm | 3.20 |
| M10 | 1.5 | 18.0 mm | 6.0 mm | 6.0 mm | 10.5 mm | 5.55 |
Application Scenarios
Our DIN 7991 Flat Head Socket Cap Screws are engineered for reliability in demanding B2B and industrial applications. The countersunk head creates a flush finish, while the Grade 10.9 strength and black oxide coating ensure lasting performance.
Industrial Machinery: Perfect for securing machine guards, panels, and frames on CNC equipment and assembly lines. Provides a smooth, snag-free surface that withstands vibration.
Jigs & Fixtures: Ideal for mold plates, welding jigs, and workholding devices. Offers high torque capability and durability for frequent adjustment and disassembly.
Conveyor Systems: Used to attach wear strips and guards on conveyors. The flush installation prevents material catch-up, and the black oxide finish resists corrosion.
Precision Equipment: Ensures a clean, professional finish in electronic enclosures, instrument housings, and control cabinets where a flat surface profile is critical.
Frequently Asked Questions (B2B-oriented)
A: Yes. As a manufacturer, we guarantee full compliance with the DIN 7991 standard. Our Grade 10.9 screws are manufactured from alloy steel and undergo rigorous quality checks to ensure all mechanical properties and dimensional tolerances are met. Test certificates are available upon request.
A: For standard sizes (e.g., M4-M12), we typically ship within 3-5 days. We offer stocking programs for high-volume partners to ensure a consistent supply and reduce your inventory burden. Contact us to discuss a tailored program.
A: Absolutely. We specialize in providing tailored solutions. We can produce custom lengths, offer alternative platings (e.g., zinc plating, geomet), and supply non-standard materials including stainless steel (A2/A4). Submit your specifications for a prompt quote.
A: Black oxide provides a durable, black matte finish that is less reflective and offers minimal dimensional change. It is ideal for internal components and applications where a low-profile, corrosion-resistant finish is needed. For enhanced corrosion protection in harsh environments, we recommend zinc plating or other alternatives.
A: Our MOQ is flexible to support small to medium-sized businesses, typically starting at 1,000 pieces per size. Standard packaging is in poly bags with clear labels, packed in cartons. Bulk packaging or customized labeling is available for larger orders.
A: We use controlled alloy steel and a precise heat-treatment process. Every production batch is verified for hardness, tensile strength, and yield strength to ensure consistent Grade 10.9 performance you can rely on for critical applications.