In precision mechanical assembly and cross-border manufacturing, the Hex Socket Countersunk Head Screw provides a reliable fastening solution for global precision applications. Compliant with DIN7991, Shenhu designs these screws to break cross-border standard barriers and deliver secure connections. Moreover, they suit 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. As a result, it ensures a 100% flat surface, avoids protrusions, and meets strict aesthetic and functional requirements.
Material & Performance
Shenhu manufactures the screws using premium stainless steel options:
SUS304 Version
- Cr ≥ 18%, Ni ≥ 8%
- Suitable for general industrial, outdoor, and electronic applications
- Neutral salt spray resistance ≥ 48h
SUS316 Version
- 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%
Together, these material and mechanical properties ensure corrosion resistance, durability, and long-term reliability in diverse environments.
Head & Structural Features
The tapered countersunk head has a 90° angle ±2°, ensuring a perfect fit in countersunk holes. In addition, the smooth arc transition and chamfered edges prevent damage to contact surfaces. The hex socket meets DIN7991 tolerance and fits 99% of hex keys, allowing high torque transfer without slipping. This makes the screws suitable for both automated high-speed assembly and precise manual installation.
Applications Across Industries
Shenhu Hex Socket Countersunk Screws are widely used across industries:
- Electronics: Secures circuit boards, enclosures, smartphones, laptops, industrial controllers, and cameras
- Construction & Furniture: Provides hidden fasteners for doors, windows, curtain walls, and furniture, ensuring flat, aesthetic surfaces
- Automotive: Secures interior panels, dashboards, and seat rails without protrusions that affect comfort or space
- Medical: Complies with hygiene and corrosion standards for surgical instruments and diagnostic devices
- Other Industries: Aerospace components, renewable energy equipment, and precision instruments
Consequently, these screws provide reliable, flush assembly that maintains performance, aesthetics, and durability in high-volume production.
Certifications & Compliance
Shenhu ensures that all screws comply with RoHS and EU REACH standards, and they are free of Pb, Cd, Hg, and other harmful substances. As such, they guarantee flat, reliable, and durable assemblies, balancing performance, quality, and appearance.
For global buyers seeking flush assembly, standard compliance, and long-term durability, SUS304/SUS316 hex socket countersunk screws provide a dependable fastening solution and enhance 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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