Genuine SINOTRUK Hex Socket Head Cap Screw Q218B0820 - High-Strength Engine Fastener

This Genuine SINOTRUK Hex Socket Head Cap Screw (Part Number: Q218B0820) is a precision-engineered fastener designed for high-stress applications in SINOTRUK heavy-duty trucks. Manufactured from alloy steel (Grade 12.9) through cold forging, this screw offers exceptional tensile strength (up to 1,220 MPa) and reliable clamping force in critical components like engine blocks, transmission systems, and braking assemblies. The deep hexagonal socket allows for high-torque installation with standard hex keys, while the black oxide coating provides corrosion resistance and reduced friction during assembly. OEM-approved for durability, this screw ensures perfect fitment and vibration resistance in extreme operating conditions.

Technical Specifications:

• Part Number: Q218B0820

• Type: Hex Socket Head Cap Screw

• Thread Size: M12 x 1.75 mm

• Length: 80 mm (under head measurement)

• Head Diameter: 18 mm

• Socket Size: 10 mm hex key

• Material: Alloy Steel Grade 12.9

• Surface Treatment: Black Oxide Finish

• Tensile Strength: 1,220 MPa

• Proof Load: 970 MPa

• Hardness: 39-44 HRC

• Torque Specification: 85-90 Nm (dry threads)

• Temperature Range: -40°C to +135°C

• Compatibility: SINOTRUK HOWO, Striver, T7H series with MC07/MC11 engines

• Warranty: 24 months against material defects

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Installation Notes:

1. Ensure threaded holes are clean and free of debris. Use a thread chaser if necessary to remove rust or damage.

2. Apply a mild anti-seize compound (e.g., copper-based) to threads for high-temperature applications to prevent galling.

3. Use a calibrated torque wrench and a high-quality 10mm hex key to avoid socket rounding. Tighten gradually to 85-90 Nm.

4. For critical engine components, follow a criss-cross tightening pattern to ensure even pressure distribution.

5. Do not reuse screws in safety-critical assemblies (e.g., braking systems) due to risk of fatigue failure.

6. Inspect screw heads for wear or deformation before installation. Replace if defects are visible.

7. Store in a dry environment to prevent pre-installation corrosion.