CAT 068-7652 WASHER

CAT 068-7652 is a Caterpillar genuine steel flat washer (heavy-duty type), suitable for bolted connections in engine cylinder heads, connecting rods, and transmission housings. It is used to distribute preload, prevent loosening, and provide a seal. The following is pure original data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 068-7652, Type: Flat Washer (Heavy-duty), Material: 45# Steel (Quenched and Tempered), Single Weight: 0.085 kg, Operating Temperature: -40℃ to +150℃, Rated Bearing Pressure: ≤80 MPa, Surface Treatment: Zinc-plated and Passivated, Corrosion Resistance: ≥96 hours Salt Spray, Compatible Bolt Size: M16-M20, Fit Tolerance: h12, Non-elastic Structure

Key Dimensions (Metric/Imperial): Inner Diameter: 17 mm (0.669 in), Outer Diameter: 30 mm (1.181 in), Thickness: 4 mm (0.157 in), Chamfer: C1.0 mm, Flatness: ≤0.02 mm, Surface Roughness: Ra≤3.2 μm, Burr-free Edges, Hole Diameter Tolerance: +0.10/-0.05 mm, Outer Diameter Tolerance: +0.20/-0.10 mm

Performance Parameters Surface hardness HB 220-260, core hardness HB 180-220, compressive strength ≥600 MPa, shear strength ≥350 MPa, coefficient of thermal expansion 11.7×10^-6/℃, no sealing function, suitable for tightening torque 45-65 N・m, reusable ≤3 times.

Structure and Compatibility Characteristics

Heavy-duty load-bearing design: Thickened 4 mm structure, heat-treated to improve overall rigidity, suitable for heavy-duty parts such as engine cylinder heads and connecting rods, dispersing bolt preload and preventing deformation or cracking of connecting parts due to stress concentration.

Stable and anti-loosening: Strictly controlled flatness and roughness, ensuring a tight fit with connecting parts after installation, reducing the risk of bolt loosening under vibration conditions, suitable for high-frequency vibration parts such as gearbox housings.

Corrosion-resistant and durable: Galvanized passivated surface treatment, suitable for outdoor and dusty conditions in engineering machinery, extending gasket life and reducing maintenance frequency.

Compatible Models and Application Scenarios

Engine Systems: Compatible with cylinder head bolts and connecting rod bolts of Caterpillar heavy-duty diesel engines such as the 3126B, 3176, 3306, C-10, and C-12.

Construction Machinery: Compatible with gearbox housing and rear axle housing bolt connections of equipment such as the 966H and 988K loaders, D6 and D8 bulldozers, and 777 mining trucks.

Application Scenarios: Used for the load-bearing surfaces of heavy-duty bolt connections, serving to prevent loosening, distribute loads, and protect the surface of the connecting parts. Suitable for harsh working conditions requiring long-term, high-intensity operation.

Installation and Maintenance Points (Original Data)

Installation: Clean the washers and connecting surfaces, ensuring they are free of oil and metal shavings. Inspect the washers for deformation, cracks, or rust; replace if necessary.

Match the specifications of the washers and bolts. Install them with the flat surfaces of the connecting parts. Reverse or incorrect installation is prohibited. Tighten bolts in a symmetrical, cross-tightening sequence, controlling the torque between 45-65 N·m.

After installation, check the gap between the connecting surfaces to ensure the washers are fully fitted and not warped in any areas.

Maintenance: Check the condition of the washers every 1500 hours. Replace them immediately if deformation, wear, or corrosion is observed.

Inspect the washers simultaneously with the bolts to avoid reducing the fit accuracy due to separate replacement.