Release time：2020-01-16 18:44 Browse：
### 1. **Material & Mechanical Properties**
- **Grade 8.8 Steel**:
- Medium-carbon steel (e.g., 45#/1045) quenched and tempered.
- Tensile strength: ≥800 MPa; yield strength: ≥640 MPa (0.2% proof stress).
- Elongation at break: ≥12%, suitable for high-stress applications.
### 2. **Design & Dimensions**
- **Extended Hexagon Socket Head**:
- Conforms to ISO 4762 (cylindrical head with internal hex drive).
- Head diameter: 1.5×d (e.g., M10 head = 16mm); socket size: per ISO 273 (e.g., M10 = 6mm key).
- **Triple Combination Structure**:
- Bolt + flat washer + spring washer pre-assembled for quick installation.
- Washer specifications:
- Flat washer: DIN 971 (OD = 2×d, e.g., M10 = 20mm).
- Spring washer: DIN 127 (standard wave type for anti-loosening).
- **Size Range**:
- Metric: M6–M24; lengths: 30–300mm (extended for deep mounting).
### 3. **Blue & White Zinc Plating**
- **Surface Treatment**:
- Electroplated zinc with blue-white chromate passivation (RoHS-compliant, CrVI-free).
- Coating thickness: 8–12μm, providing 500+ hours of salt spray resistance (ASTM B117).
- **Appearance**:
- Bright zinc finish with blue-white iridescence, suitable for aesthetic and corrosion protection.
### 4. **Technical Features**
- **Thread Specifications**:
- Metric coarse thread (ISO 68-1) with 6g tolerance; full/half-threaded options.
- Thread-locking design: Spring washer provides dynamic anti-loosening in vibration environments.
- **Assembly Advantages**:
- Pre-assembled washers eliminate separate part handling, reducing installation time by 30%.
### 5. **Applications**
- **Industrial Machinery**:
- Heavy equipment, motors, and conveyor systems requiring high-strength fastening.
- **Construction & Infrastructure**:
- Steel structures, bridges, and precast concrete connections (compliant with EN 1090).
- **Automotive & Transportation**:
- Engine components, chassis mounts, and trailer assemblies.
- **Electronics & Engineering**:
- High-torque applications in switchgear and heavy-duty machinery.
### 6. **Quality Control & Testing**
- **Mechanical Testing**:
- Tensile tests, hardness (Rockwell C 22–32 HRC), and thread gauging (Go/No-Go).
- **Plating Inspection**:
- Coating thickness via XRF; salt spray testing to ensure 500+ hours resistance.
- **Certifications**:
- ISO 9001, CE, and RoHS compliance; material test reports (MTRs) available.
### 7. **Packaging & Supply**
- **Bulk Packaging**:
- 500–1,000 pieces per carton with moisture-proof bags; palletized for large orders.
- **Lead Times**:
- Standard sizes: 24–48h shipping; custom lengths: 5–7 working days.
### 8. **Installation & Usage Tips**
- **Torque Recommendations**:
- Follow ISO 898-1 (e.g., M12: 35–40 Nm for dry threads; 28–32 Nm with lubricant).
- **Environmental Limits**:
- Suitable for -40°C to +120°C; avoid direct contact with acidic substances (pH <4).
### 9. **Advantages vs. Alternatives**
- **vs. Plain Steel**:
- 3x better corrosion resistance with blue-white zinc plating.
- **vs. Single-Part Bolts**:
- Triple combination reduces assembly errors and enhances vibration resistance.
