Pre-assembled hex bolt with flat and spring washers, designed for heavy-duty fastening in industrial manufacturing, construction, and heavy equipment. Available in M3–M12, combining a hex bolt, flat washer, and spring washer into a single unit to eliminate misplacement, misalignment, or omission during assembly.
Key features:
- High Torque Capability: Optimized hex head design supports wrenches and sockets for secure fastening in high-strength applications.
- Material Options: Carbon steel 8.8-grade (tensile strength ≥800MPa) or SUS304/SUS316 stainless steel for corrosion resistance.
- Washer Functionality: Flat washers evenly distribute load; spring washers provide vibration resistance and maintain pre-tension.
- Precision & Assembly: Pre-assembled with tight coaxiality (≤0.1mm) for efficient torque transfer and stable connection.
- Surface Treatment: Zinc plating, blackening, or passivation options; salt spray resistance ≥48 hours.
- Global Compliance: RoHS certified, suitable for international industrial, automotive, marine, and construction applications.
Ideal for steel structures, mechanical frames, machinery, automotive chassis, marine equipment, and other heavy-load assembly scenarios.
| Parameter | Specification / Range | Notes |
|---|---|---|
| Standards | ISO 225 / EN15048-1:2016 | International and export compliance |
| Component Structure | 1 Hex Bolt + 1 Flat Washer + 1 Spring Washer | Pre-assembled unit |
| Thread Size | M3 – M12 | Metric coarse thread; M3:1.0mm, M4:1.4mm, M5:1.6mm, M6:2.0mm, M8:2.5mm, M10:3.0mm, M12:3.5mm |
| Thread Accuracy | 6g/6H | Pitch deviation ≤±0.02mm; flank angle ≤±1° |
| Bolt Length | 5 – 90mm | M3 min 5mm, M12 max 90mm |
| Head Width Tolerance | ±0.2mm | Across flats |
| Shank Straightness | ≤0.1mm/m | Ensures assembly alignment |
| Material – Carbon Steel | 35 / 45 Steel, Grade 8.8 | Yield ≥640MPa, Tensile ≥800MPa, Elongation ≥12%, Brinell Hardness 250–331HB |
| Material – Stainless Steel | SUS304, Grade 70 | Cr≥18%, Ni≥8%, C≤0.08%, corrosion-resistant |
| Flat Washer | Stamped steel, smooth edges | Distributes load, protects surface |
| Spring Washer | 65Mn spring steel | Elastic recovery ≥92%, resists vibration |
| Coaxiality | ≤0.1mm | Bolt and washers aligned |
| Torque Capacity | ≤120% of standard torque | e.g., M10 ≤120N·m |
| Surface Treatment Options | Zinc plating / Blue-white zinc / Hot-dip galvanizing / Black / Nickel plating / Passivation | Salt spray resistance ≥48–96h depending on treatment |
| Compliance | RoHS | Meets environmental & export requirements |
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