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The Dongfeng Truck Bolt Series comprises high-strength, precision-engineered fasteners designed for critical applications in Dongfeng commercial vehicles, including chassis assembly, suspension systems, engine mounts, brake components, and bodywork. Manufactured to strict OEM standards, these bolts ensure structural integrity, safety, and reliability under heavy-duty operating conditions.

Key Applications

• Compatible Dongfeng Truck Models:
  • EQ140, EQ145, EQ153, EQ1168, EQ1250, EQ2102, and other medium- to heavy-duty cargo trucks, dump trucks, buses, and military/special-purpose vehicles.
  • Ideal for applications requiring high tensile strength, vibration resistance, and corrosion protection (e.g., chassis frame joints, suspension brackets, and engine-to-transmission mounts).
• Industrial Use:
  • Agricultural machinery conversions, mining equipment, and aftermarket upgrades.

Technical Specifications

1. Material & Construction:
   • Primary Material:
     • Alloy steel (40Cr, 35CrMo, or equivalent) for high-strength bolts (Grade 10.9 or 12.9).
     • Carbon steel (Q235, Q345) for general-purpose bolts (Grade 8.8).
   • Surface Treatment:
     • Zinc plating (yellow or white) for corrosion resistance (salt spray tested for 480+ hours).
     • Dacromet coating (for severe environments) or black oxide finish (for interior applications).
     • Thread locking patches (e.g., Loctite 243 equivalent) for critical vibration-prone areas.
2. Key Dimensions (Example: Dongfeng EQ153 Chassis Bolt):
   • Thread Size: M12 × 1.75, M14 × 2.0, M16 × 2.0, or M20 × 2.5 (metric fine thread).
   • Length: 40–150 mm (1.57–5.91 inches) (varies by application).
   • Head Type: Hex head (17 mm or 19 mm wrench size), flange head, or carriage bolt.
   • Grade Marking: “10.9” or “12.9” stamped on the head for identification.
3. Design Features:
   • High Tensile Strength:
     • Grade 10.9 bolts: Minimum tensile strength of 1,040 MPa (150,800 psi).
     • Grade 12.9 bolts: Minimum tensile strength of 1,220 MPa (176,900 psi).
   • Precision Threads: Rolled threads for fatigue resistance and consistent torque application.
   • Flange Head Design: Distributes clamping force evenly (used in suspension and engine mounts).
4. Performance Ratings:
   • Torque Specifications:
     • Grade 10.9: 120–150 N·m (88.5–110.6 lb·ft) for M12 bolts.
     • Grade 12.9: 140–180 N·m (103.3–132.8 lb·ft) for M14 bolts.
   • Operating Temperature Range: -40°C to +150°C (-40°F to +302°F).
   • Vibration Resistance: Passes 1,000-hour vibration tests (per ISO 16130).

Key Features

1. Superior Strength & Durability:
   • Alloy steel construction withstands heavy loads, impacts, and dynamic stresses.
   • Rolled threads reduce stress concentrations and prevent thread failure.
2. Corrosion Protection:
   • Zinc plating and Dacromet coatings ensure longevity in harsh environments (salt, humidity, chemicals).
   • Thread-locking patches prevent loosening due to vibration.
3. Precision Engineering:
   • Tight dimensional tolerances ensure compatibility with Dongfeng OEM components.
   • Flange heads and washers reduce surface pressure and prevent gasket damage.
4. Wide Application Range:
   • Available in various sizes, grades, and head types for chassis, suspension, engine, and bodywork.
   • Direct replacements for Dongfeng part numbers (e.g., DF-BOLT-XXXX – refer to vehicle manual).
5. Cost-Effective Reliability:
   • Reduces maintenance costs by preventing bolt failure and component damage.
   • Extends service intervals for critical assemblies.