Genuine Sinotruk Washer (Ripper) 805-338-284 – Unmatched Durability and Load Distribution for Heavy-Duty Attachments
Precision-Engineered Flat Washer for Critical Bolted Joints
The Sinotruk Washer 20 805-338-297 is a genuine OEM precision flat washer engineered to provide superior load distribution, surface protection, and accurate spacing in Howo and Sinotruk heavy-duty trucks. As an essential component of every high-strength bolted connection, the 805-338-297 ensures that clamping forces are evenly transmitted, preventing galling, embedding, and joint loosening – all critical for maintaining structural integrity under the extreme vibrations and dynamic loads common on Nigerian roads.
This 805-338-297 washer is manufactured from high-carbon spring steel, heat-treated to a hardness of 38–42 HRC, and coated with a durable zinc-nickel layer for exceptional corrosion resistance. Its precise inner and outer diameters, along with a controlled thickness, guarantee a perfect fit for M20 fasteners in chassis, suspension, and engine mounting applications. Trust the genuine Sinotruk 805-338-297 to protect your critical joints from uneven wear and premature failure.
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Engineering Excellence Behind the 805-338-297 Washer 20
The 805-338-297 is far more than a simple stamped piece of metal – it is a precision-engineered component that plays a pivotal role in the longevity and safety of your vehicle. Manufactured from high-carbon spring steel (SAE 1074/1095), it is carefully heat-treated to achieve a hardness of 38–42 HRC, providing the necessary resistance to embedment and deformation under high clamp loads. Its flatness and parallelism are controlled to within 0.05 mm, ensuring that when placed under a bolt head or nut, it distributes the load uniformly across the bearing surface.
The zinc-nickel coating on the 805-338-297 offers outstanding protection against corrosion, far surpassing standard zinc plating. This is particularly vital in Nigeria’s coastal regions where salt-laden air can rapidly degrade unprotected hardware. The coating also provides a consistent friction coefficient, which helps in achieving accurate torque-tension relationships during assembly – a key factor in preventing both under-tightening and over-tightening.
In typical Howo truck applications, the 805-338-297 is used under high-strength bolts in locations such as axle U-bolt plates, suspension spring eye connections, and engine cross-member mounts. Its precise 20mm inner diameter fits M20 bolts perfectly, and its 37mm outer diameter offers ample bearing area to prevent the bolt head or nut from pulling into soft materials like aluminium or cast iron.
Technical Specifications – Washer 20 805-338-297
| Parameter | Specification |
|---|---|
| OEM Part Number | 805-338-297 |
| Product Name | Washer 20 (Flat washer, hardened) |
| Brand | Sinotruk (Genuine OEM) |
| Inner Diameter (ID) | 20.5 mm (nominal for M20) |
| Outer Diameter (OD) | 37.0 mm |
| Thickness | 3.5 mm |
| Material | High-carbon spring steel (SAE 1074/1095) |
| Hardness | 38 – 42 HRC |
| Coating | Zinc-nickel (yellow passivation) |
| Corrosion Resistance | ≥ 720 hours salt spray (ISO 9227) |
| Flatness Tolerance | ≤ 0.05 mm |
| Application | Chassis, suspension, engine mounts, U-bolt plates |
| Compatible Models | Howo A7, T7, C7H, HW series; Sinotruk heavy-duty trucks |
Why the Genuine Sinotruk 805-338-297 Outperforms Generic Washers
Generic washers are often made from low-grade steel that is not heat-treated, leading to rapid deformation under load and loss of clamp force. The 805-338-297, with its hardened spring steel construction, maintains its flatness and thickness even after years of service, ensuring consistent load distribution. Its zinc-nickel coating also offers significantly better corrosion resistance than the simple zinc plating or black oxide found on many aftermarket washers.
Moreover, the precise dimensions of the 805-338-297 guarantee that it will not interfere with the bolt threads or the bearing surface of the component being clamped. Generic washers often have oversized IDs or undersized ODs, which can lead to improper seating and uneven loading, increasing the risk of bolt loosening or component damage.
Advanced Material Science for Long-Term Reliability
The high-carbon steel used in the 805-338-297 is carefully selected for its ability to maintain hardness and dimensional stability under cyclic loading. Its fine-grained microstructure, achieved through controlled quenching and tempering, provides excellent resistance to creep and stress relaxation. This means that the washer will continue to perform its load-spreading function even after millions of vibration cycles, a critical advantage for trucks operating on Nigeria’s rough roads.
Compatibility and Fitment
The 805-338-297 is a direct replacement for the original washer in a wide range of Sinotruk and Howo models. Its dimensions are optimized for M20 bolts, with a 20.5mm ID that accommodates the nominal bolt diameter and a 37mm OD that fits standard flanged nuts and bolt heads. Always verify that the washer thickness (3.5mm) does not adversely affect thread engagement or clamp length in your specific application.
Explore the full range of genuine Howo Parts available for your fleet, including fasteners, suspension components, and chassis hardware. The 805-338-297 washer is an essential part of that ecosystem – and with Sinotruk’s original quality, you can be confident that every critical joint will be properly supported.
Installation Best Practices for the 805-338-297
Proper installation of the 805-338-297 is straightforward but critical for achieving the desired joint performance. Always place the washer directly under the bolt head or nut, with the smooth (or coated) side facing the bearing surface to minimise friction and galling. Ensure that the washer sits flat against the joint surface and that the bolt or nut can rotate freely without binding. Apply the recommended torque for the specific bolt size and grade, and re-torque after the initial run-in period to account for any settlement.
During routine maintenance, inspect the 805-338-297 for signs of deformation, corrosion, or cracking. If any washer shows signs of embedding or distortion, it should be replaced with a new 805-338-297 to maintain proper clamp force and load distribution.
Built for Nigeria – Durable Load Support in Harsh Environments
Nigeria’s heavy-duty trucking and construction sectors demand components that can withstand extreme heat, humidity, dust, and vibration. The 805-338-297 is engineered to excel in these conditions. Its hardened steel construction and zinc-nickel coating ensure that it resists both mechanical deformation and corrosion, maintaining its effectiveness over the long term.
Furthermore, the precise load distribution provided by the 805-338-297 helps prevent fretting and galling between bolt heads and structural components – a common issue that can lead to costly repairs and downtime. By choosing the genuine Sinotruk 805-338-297, fleet operators can reduce maintenance frequency and extend the service life of their vehicles’ critical joints.
Protect Your Joints with the Genuine 805-338-297 Washer 20
The 805-338-297 Washer 20 may be a small component, but its role in maintaining joint integrity is enormous. Its superior material, precise dimensions, and exceptional corrosion resistance make it the definitive choice for professional workshops and fleet managers. Every time you install a genuine Sinotruk 805-338-297, you are ensuring that your bolted connections remain secure, reducing the risk of loosening and failure.
Don’t settle for generic washers that may not provide the same level of protection and durability. Insist on the genuine 805-338-297 – the washer trusted by experienced mechanics and fleet operators across Nigeria. With its proven performance in heavy-duty applications, this washer delivers the reliability and peace of mind you deserve.
Genuine Sinotruk 805-338-297 – Engineered for excellence. Built for Africa. Trusted by professionals.
Packaging & Shipping
Every Howo part is carefully packaged and shipped to ensure it arrives in perfect condition, ready for installation. Our professional logistics process guarantees timely delivery across Nigeria.
Secure Packaging
Each Howo part is individually wrapped in protective materials and placed in reinforced cardboard boxes to prevent damage during transit.
Dedicated Transport
We use our own Sinotruk logistics fleet for reliable delivery, ensuring parts reach customers quickly and safely across all regions of Nigeria.
Quality Inspection
Before shipping, each part undergoes final quality checks and is clearly labeled with its OEM number for easy identification.
Nationwide Distribution
Our extensive distribution network covers all major cities and rural areas in Nigeria, ensuring prompt delivery to construction sites, workshops, and businesses.
Shipping Information for Nigerian Customers
• Standard Delivery: 3-5 business days to major cities (Lagos, Abuja, Port Harcourt, Kano)
• Express Delivery: 1-2 business days available for urgent orders
• Regional Coverage: We deliver to all 36 states including remote areas
• Tracking: All shipments include real-time tracking information
Upgrade Your Sinotruk Truck Today with Howo parts!
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