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In heavy-duty vehicles, vibration and dynamic loads can cause bolted connections to loosen over time, leading to component failure. The genuine SINOTRUK HOWO Q40308F31 Spring Washer provides a simple yet effective solution by exerting continuous spring tension under the bolt head or nut. As a trusted component among Sinotruk howo parts, this spring washer ensures consistent clamping force, prevents fastener rotation, and maintains joint integrity in the harshest environments. Manufactured from high-carbon spring steel with a protective finish, the Q40308F31 washer resists corrosion, fatigue, and permanent set. Investing in this authentic part reduces maintenance frequency, enhances safety, and extends the life of your SINOTRUK HOWO truck’s chassis and drivetrain assemblies.
Spring Washer
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The Q40308F31 spring washer is formed from high-carbon spring steel, heat-treated to achieve the optimal balance of hardness and elasticity. Its split, trapezoidal shape provides a powerful spring action that maintains tension even after the bolt has been tightened. This continuous force compensates for any settling of the joint or relaxation of the fastener, preventing loosening due to vibration. The washer’s edges are deburred to avoid scoring the mating surfaces, and its consistent dimensions ensure a perfect fit for the corresponding bolt size.
A protective zinc or dacromet coating is applied to the Q40308F31 washer, offering excellent corrosion resistance against moisture, road salts, and chemicals. This ensures long-term reliability even in the most challenging under-vehicle environments. The washer is designed to meet SINOTRUK HOWO’s strict quality standards, including precise inner and outer diameters, thickness, and load capacity. Whether used in suspension, engine mounts, or frame connections, this spring washer is a critical component for maintaining secure bolted joints.
The table below provides detailed technical specifications for the genuine SINOTRUK HOWO Q40308F31 Spring Washer. This data is essential for verifying compatibility with your bolt size and application requirements.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | Q40308F31 | SINOTRUK HOWO Original Code |
| Product Name | Spring Washer | Split lock washer |
| Material | High-carbon spring steel (65Mn) | Heat-treated |
| Inner Diameter (d) | 8.4 mm (for M8 bolt) | Nominal fit |
| Outer Diameter (D) | 14 mm (typical) | Enlarged bearing surface |
| Thickness (s) | 2.1 mm | Standard heavy series |
| Hardness | HRC 40-48 | Resists permanent set |
| Surface Finish | Zinc-plated / Dacromet | Corrosion resistant |
| Operating Temperature | -50°C to +150°C | Suitable for all climates |
| Weight (approx.) | 1.5 grams | Light but strong |
| Compatible Bolt Size | M8 (metric) | Check with part number |
| Applications | Chassis, engine mounts, suspension | General heavy-duty |
Installing the Q40308F31 spring washer is straightforward: place it between the bolt head (or nut) and the workpiece, with the split side facing the fastener. As the bolt is tightened, the washer compresses, storing energy that resists loosening. Always use the correct torque value specified by SINOTRUK HOWO for the bolt size and joint type. Ensure the washer is centered and fully seated. Never reuse a spring washer that has been crushed, as it may have lost its tension.
The Q40308F31 spring washer is designed for M8 bolts and is a direct OEM replacement for the original part. Compatibility must be verified by matching the part number with your vehicle’s fastener specifications. Using the correct washer ensures optimal locking action and prevents loosening due to vibration. For critical joints, consider using a spring washer in combination with a flat washer to protect the surface. Always use genuine SINOTRUK HOWO parts for guaranteed performance.
In high-vibration areas, spring washers provide an extra layer of security. However, they should be replaced whenever a joint is disassembled, as they can lose elasticity over time. Always use new Q40308F31 washers for reassembly.
The Q40308F31 spring washer maintains tension in bolted joints, preventing them from coming loose due to vibration, shock, or thermal cycling. This enhances the reliability and safety of your SINOTRUK HOWO truck.
The protective coating ensures the washer withstands rust and corrosion, maintaining its spring properties over the long term. This is especially important in chassis applications exposed to road salts and moisture.
Using high-quality OEM spring washers prevents costly repairs caused by loose fasteners. They are an inexpensive yet essential component for long-term reliability and reduced downtime.
A spring washer should be replaced if it shows signs of corrosion, deformation, or if it has been compressed beyond its elastic limit (flattened). During maintenance, inspect all washers for cracks or loss of tension. If a joint has loosened, the washer may have failed and must be replaced with a new genuine Q40308F31 unit. Never reuse old spring washers, as they may not provide adequate locking force.
Regular inspection of critical fasteners, especially in suspension and steering components, is recommended. Replacing worn washers proactively prevents unexpected failures and ensures the safety of your vehicle.
To maximize the life of your spring washers, always use them in conjunction with proper torque values. Avoid over-tightening, which can flatten the washer and reduce its effectiveness. Keep them clean and free of debris during installation. During routine service, check the tightness of critical bolts and replace any suspect washers.
Store spare Q40308F31 washers in a dry place to prevent corrosion before use. Following these simple practices will help maintain the integrity of your SINOTRUK HOWO’s bolted joints.
Spring washers may seem simple, but their performance is critical. Generic aftermarket washers may have incorrect material hardness, leading to permanent set and loss of locking ability. They may also lack proper corrosion protection, rusting quickly in service. The genuine SINOTRUK HOWO Q40308F31 spring washer is manufactured to exact specifications, with controlled heat treatment, precise dimensions, and durable coating.
By choosing the authentic part, you ensure that every bolted joint performs as engineered, maintaining the safety and reliability of your truck. For fleet managers and owner-operators who prioritize long-term performance, the genuine Q40308F31 is the intelligent choice.
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