Product Overview
The stainless steel hex socket button head screw, compliant with ISO7380, is a core fastener favored by global buyers in precision machinery, electronics, medical devices, and automotive components. Its smooth, rounded head design prevents surface scratches during assembly, making it ideal for applications requiring flat, flush surfaces in high-precision equipment.
Material & Corrosion Resistance
- SUS304 (A2-70): Suitable for general industrial environments, outdoor installations, and electronic devices; resistant to neutral salt spray ≥48 hours.
- SUS316 (A4-70): With added molybdenum (Mo≥2%), it offers 3× enhanced chloride corrosion resistance; neutral salt spray ≥100 hours, ideal for marine, chemical, and high-humidity environments, including shipbuilding, coastal engineering, and medical equipment.
Mechanical Properties
- Tensile strength ≥700MPa, yield strength ≥450MPa (A2-70 and A4-70 grades)
- Elongation at break ≥12%, ensuring stable connections under heavy loads and vibration
Design & Manufacturing Advantages
- Button head design with smooth rounded transition prevents surface damage
- Hex socket precisely conforms to ISO7380 standards for efficient torque transfer with no slipping
- Manufactured through cold heading, precision rolling, and passivation processes
- Head dimensional tolerance ±0.02mm, ensuring reliable automated or manual assembly
Applications
- Electronics: Internal fastening for smartphones, laptops, industrial controllers, and other slim devices
- Medical Devices: Surgical instruments, diagnostic equipment, meeting hygiene and corrosion resistance requirements
- Automotive Components: Instrument panels, interior parts, sensors, capable of withstanding vibration and temperature fluctuations
- Other Industries: Furniture manufacturing, aerospace components, renewable energy equipment, and more
Environmental & Compliance
- RoHS certified
- EU REACH compliant
- Free of lead, cadmium, and other harmful substances, suitable for stringent global procurement standards
| Parameter | Specification / Range | Notes |
|---|---|---|
| Standard | ISO7380 | Compatible with international cross-border procurement |
| Thread Type | Metric coarse thread | ISO 68-1 |
| Thread Pitch | 0.35 mm (M1.6) – 6 mm (M64) | Matches different load requirements |
| Nominal Diameter | M1.6 – M64 | Full series coverage |
| Screw Length | 4 mm – 200 mm | Full-thread (ISO 8673) and half-thread options |
| Thread Length | M1.6–M10: 1/2 of screw length M12–M64: 2/3 of screw length |
Minimum 10 mm |
| Material | SUS304 (A2-70) SUS316 (A4-70) |
High corrosion resistance |
| Corrosion Resistance | SUS304: ≥48h neutral salt spray SUS316: ≥100h neutral salt spray |
SUS316 adds Mo≥2% for chloride resistance |
| Mechanical Properties | A2-70: Tensile ≥700MPa, Yield ≥450MPa A4-70: Tensile ≥700MPa, Yield ≥450MPa, Elongation ≥12% |
Reliable under heavy loads and vibration |
| Head Type | Button / Flat Round (Pan Head) | Smooth arc transition |
| Head Diameter | 1.8 – 2.5 × shaft diameter (e.g., M8 → 16 mm) | Ensures flush assembly, avoids surface scratches |
| Head Height | 0.5 – 0.8 × shaft diameter (e.g., M8 → 6 mm) | – |
| Fillet Radius | 0.2 – 1.5 mm (increasing with size) | Smooth edge transition |
| Hex Socket Width | 1.5 – 14 mm | Fits standard hex key |
| Socket Depth | 0.7 – 1.1 × shaft diameter | High torque transfer, no slipping |
| Surface Roughness | Ra ≤0.8 μm | Smooth, defect-free |
| Thread Accuracy | 6g | ISO standard |
| Concentricity Tolerance | M1.6–M10: ≤0.15 mm M12–M64: ≤0.25 mm |
Head-to-shank alignment |
| Straightness Tolerance | ≤0.2 mm/m | Shaft straightness |
| Surface Treatment | SUS304: natural passivation SUS316: optional black passivation |
Burr-free, no cracks or oxidation |
| Precision Grade | A | High precision fastener |
| Weight Range | 0.03 g (M1.6×4) – 1850 g (M64×200) | – |
| Packaging | Single piece, 100 pcs/box, 500 pcs/box, or custom | Flexible options |
| Compliance | RoHS, EU REACH | Lead, cadmium, mercury-free |
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