In precision mechanical assembly and cross-border manufacturing, stainless steel hex socket countersunk head screws are the preferred fasteners for global precision applications. Compliant with DIN7991, they break cross-border standard barriers and provide reliable connections for industries including machinery, electronics, construction, and automotive interiors. Unlike cylindrical or flat round head screws, the countersunk head features a tapered design that sits flush in the workpiece, ensuring a 100% flat surface, avoiding protrusions, and meeting strict aesthetic and functional requirements.
Material & Performance
- Made from SUS304 (A2-70) and SUS316 (A4-70) stainless steel.
- SUS304: Cr ≥ 18%, Ni ≥ 8%, suitable for general industrial, outdoor, and electronic applications; neutral salt spray resistance ≥ 48h.
- SUS316: Cr ≥ 16%, Ni ≥ 10%, Mo ≥ 2%, chloride corrosion resistance 3× higher than SUS304; neutral salt spray resistance ≥ 100h, ideal for marine, chemical, medical, and food equipment.
- Mechanical strength: A2-70 / A4-70 – tensile strength ≥ 700 MPa, yield strength ≥ 450 MPa, elongation ≥ 12%.
Head & Structural Features
- Tapered countersunk head, 90° angle ±2°, ensures perfect fit in countersunk holes.
- Smooth arc transition and chamfered edges prevent damage to contact surfaces.
- Hex socket meets DIN7991 tolerance; 99% fit with hex keys, enabling high torque transmission without slipping.
- Suitable for automated high-speed assembly or precise manual installation.
Applications
- Electronics: Fixes circuit boards, enclosures, smartphones, laptops, industrial controllers, cameras.
- Construction & Furniture: Hidden fasteners for doors, windows, curtain walls, furniture, ensuring flat and aesthetic surfaces.
- Automotive: Secures interior panels, dashboards, seat rails without protrusions affecting comfort or space.
- Medical: Compliant with hygiene and corrosion standards for surgical instruments and diagnostic devices.
- Other: Aerospace components, renewable energy equipment, precision instruments.
Certifications & Compliance
- RoHS & EU REACH compliant; free of Pb, Cd, Hg, and other harmful substances.
- Ensures flat, reliable, and durable assembly, balancing performance, quality, and aesthetics.
For global buyers seeking flush assembly, standard compliance, and long-term durability, SUS304/SUS316 hex socket countersunk screws provide a dependable connection solution and strengthen competitive advantage in international markets.
| Category | Specifications |
|---|---|
| Standards & Dimensions | Standard: DIN7991 Metric Range: M1.6 – M64 Thread Standard: ISO 68-1 coarse thread Pitch Range: 0.35mm (M1.6) – 6mm (M64) Shank Length: 4mm – 200mm Thread Type: Full thread (ISO 8673) / Partial thread Thread Length: M12-M64 ≥ 2/3 shank length, minimum 12mm |
| Material & Mechanical Properties | Material: SUS304 (A2-70) / SUS316 (A4-70) SUS304: Cr≥18%, Ni≥8%, C≤0.07%, salt spray ≥48h SUS316: Cr≥16%, Ni≥10%, Mo≥2%, C≤0.08%, salt spray ≥100h, 3× more chloride corrosion resistant than SUS304 Tensile Strength: ≥700MPa Yield Strength: ≥450MPa Elongation: ≥12% Shear Strength: ≥370MPa |
| Countersunk Head Parameters | Head Type: 90° countersunk (tolerance ±2°) Head Top Diameter: ≥1.2× hex width Head Height: 0.4–0.7× shank diameter (e.g., M8: 5mm) Max Head Diameter: 2.0–2.8× shank diameter (e.g., M8: 18mm) Hex Width Across Flats: 1.5mm (M1.6) – 14mm (M64) Hex Depth: 0.6–1.0× shank diameter Chamfer: 15°–30° Hole Roughness: Ra≤0.8μm Thread Accuracy Class: 6g |
| Manufacturing & Other | Process: Cold heading, precision rolling, passivation, countersunk head grinding Concentricity Tolerance: ≤0.15mm (M1.6–M10), ≤0.25mm (M12–M64) Shank Straightness: ≤0.2mm/m Surface Treatment: Natural passivation (SUS304) / Black passivation (SUS316 optional), 5–15μm film Countersunk Fit: ≥95% Weight Range: 0.028g (M1.6×4) – 1780g (M64×200) Packaging: Single, 100 pcs/box, 500 pcs/box, or customized export packaging with English labels and certifications Certifications: RoHS, REACH, some models FDA food contact grade (SUS316) |
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