Release time：2020-01-16 18:44 Browse：
### 1. **Design & Geometry** - **Extended length** for deep installations or thick materials, ensuring secure fastening in multi-layered structures. - **Outer hexagon head** with precise 120° flat faces allows quick tightening/loosening with wrenches or sockets. - **Integrated washer face** (flange option available) distributes clamping force, reducing surface damage. ### 2. **Material & Coating** - Constructed from **medium-carbon steel** (grade 8.8/10.9) for high tensile strength (800–1000 MPa). - **Zinc plating** (min. 5–8μm thickness) provides sacrificial corrosion protection, ideal for indoor/outdoor use. - Optional **black oxide finish** for aesthetics or reduced reflectivity in machinery. ### 3. **Thread Types** - **Metric full-thread** (ISO 68-1) with thread engagement along the entire shank for maximum clamping force. - **Metric half-thread** (ISO 4759-1) featuring a non-threaded grip length for enhanced shear strength in load-bearing joints. - **Fine/coarse pitch options** (e.g., M10x1.25 vs. M10x1.5) for tailored torque requirements. ### 4. **Applications** - **Industrial machinery**: Engine mounts, gearboxes, and conveyor systems. - **Construction**: Structural steel connections, scaffolding, and prefabricated buildings. - **Automotive**: Chassis components, suspension systems, and brake assemblies. - **Marine**: Saltwater-resistant fastening for boat fittings (with additional sealants). ### 5. **Compatibility** - Conforms to **ISO metric thread standards** (6g/6H tolerance) for universal fit with nuts and pre-threaded components. - **Magnetic properties** facilitate automated assembly in manufacturing environments. ### 6. **Quality Assurance** - **Thread pitch accuracy** verified via Go/No-Go gauges to ensure seamless nut engagement. - **Head hardness testing** (Rockwell C scale) confirms resistance to deformation under torque. - **Salt spray testing** (ASTM B117) guarantees ≥500 hours of corrosion resistance for zinc-plated variants. ### 7. **Installation Guidelines** - **Pre-tapping recommended** in hard materials (e.g., stainless steel) to prevent thread galling. - **Torque specifications**: Follow DIN 267-2 standards (e.g., M12 bolt: 70–80 Nm for 8.8 grade). - **Anti-seize compounds** (e.g., molybdenum disulfide) enhance disassembly in high-vibration applications. ### 8. **Environmental Adaptability** - **Temperature range**: -50°C to +150°C for standard zinc plating; -60°C to +250°C with special coatings. - **Chemical resistance**: Moderate tolerance to alkaline environments (pH 7–10) but avoid prolonged acid exposure. ### 9. **Packaging & Storage** - Supplied in **bulk cartons** or **retail blister packs** with labeling indicating size, thread type, and grade. - **Storage recommendations**: Keep in dry, ventilated areas to prevent moisture-induced white rust. ### 10. **Customization Options** - **Special lengths** (e.g., M16x200mm) available for OEM applications. - **Thread-locking patches** (e.g., nylon insert) for anti-vibration requirements. - **Material upgrades** (e.g., A2/A4 stainless steel) for extreme corrosion environments. ### 11. **Industry Certifications** - **ISO 9001:2015** manufacturing compliance for consistent quality control. - **RoHS/REACH compliance** for environmental safety in EU markets. - **CE marking** for conformity with European Machinery Directive 2006/42/EC. ### 12. **Global Sourcing** - **Lead times**: Standard sizes available ex-stock; custom orders fulfilled within 4–6 weeks. - **Logistics**: Palletized shipments with edge protection to prevent damage during transit. ### 13. **Safety Precautions** - **Eye protection** required during installation to avoid debris from thread cutting. - **Avoid overtightening** to prevent bolt failure; use calibrated torque wrenches. ### 14. **Technical Support** - **Engineering assistance** available for load calculations and joint design optimization. - **Cross-reference guides** for substitution of obsolete fasteners (e.g., DIN 931 → ISO 4014). ### 15. **Sustainability** - **Recyclable steel core** reduces environmental impact. - **E-coat options** available for eco-friendly corrosion protection. This detailed breakdown covers engineering specifications, application versatility, and industry best practices for these fasteners.
