Flat Washer (English)
Плоская шайба (Russian)
Arandela plana (Spanish)
The genuine Shacman OEM 90014040007 Flat Washer is a precision‑engineered fastening component for the Shacman X5000 heavy‑duty truck series. Part number 90014040007 is designed to distribute bolt load evenly, prevent surface damage, and increase joint reliability in critical chassis, engine, and suspension applications. Manufactured from high‑strength carbon steel with a corrosion‑resistant zinc‑plated finish, this flat washer meets strict dimensional tolerances (ISO 7089 / DIN 125) and provides a smooth, burr‑free bearing surface. It is an essential component for any repair or assembly where bolt preload must be maintained under high vibration and cyclic loading.
Specifically developed for WP12/WP13 engine mounts, frame crossmembers, axle fasteners, and cab suspension bolts, the 90014040007 flat washer helps prevent bolt loosening by increasing the friction area and reducing localised indentation of soft materials. For Shacman X5000 fleet operators, workshop technicians, and rebuilders, using the genuine OEM washer guarantees correct hardness, precise inner/outer diameters, and reliable crush resistance – eliminating joint failure caused by bolt embedding or washer deformation. Every Shacman flat washer is stamped from high‑grade steel, heat‑treated for stress relief, and zinc‑plated for outstanding corrosion protection (≥200 hours salt spray). The washer is 100% inspected for flatness, chamfer, and edge burrs. Trust OEM 90014040007 for secure, vibration‑proof bolted connections in the most demanding applications.
| Parameter | Specification |
|---|---|
| OEM Part Number | 90014040007 |
| Product Name | Flat Washer / Plain Washer |
| Brand / Application | Shacman X5000 (WP12 / WP13 chassis, engine mounts) |
| Material | High‑strength carbon steel (C45 / SAE 1045), zinc‑plated |
| Inner Diameter (ID) | 13.0 mm ±0.1 mm |
| Outer Diameter (OD) | 24.0 mm ±0.2 mm |
| Thickness | 2.5 mm ±0.05 mm |
| Hardness (HRC) | 25–35 (heat‑treated, stress‑relieved) |
| Surface Coating | Zinc plating with yellow chromate (≥200h salt spray) |
| Edge Treatment | Deburred, slight chamfer on outer edge |
| Standard | ISO 7089 / DIN 125 (Class A) |
| Weight (each) | ~5.8 g |
The flat washer is a deceptively simple but critical component in any bolted joint. The Shacman 90014040007 flat washer is used under the bolt head or nut to distribute clamping force over a larger area, preventing embedment of the fastener into soft materials (e.g., aluminum brackets, painted surfaces). It also protects the workpiece surface from rotational damage during tightening. In the X5000, these washers are found on engine mount bolts, chassis crossmember joints, spring hanger fasteners, and cab mounting points.
This washer is manufactured from C45 carbon steel (SAE 1045 equivalent), which provides excellent strength and ductility. After blanking, the washers are heat‑treated to relieve stamping stresses and achieve a uniform hardness of 25–35 HRC – hard enough to resist indentation but not brittle. The zinc‑plated finish with yellow chromate provides outstanding corrosion resistance, preventing the washer from rusting and seizing against the bolt or nut.
The inner diameter is precisely controlled to provide a snug fit on the bolt shank (typically M12). The outer diameter is sized to provide adequate bearing area without interfering with adjacent components. The edges are deburred and slightly chamfered to prevent cutting of the mating surface.
The 90014040007 flat washer is stamped from high‑quality carbon steel strip with a controlled thickness. After stamping, the washers are tumbled to remove burrs and then heat‑treated in a continuous mesh belt furnace. The heat treatment relieves residual stresses from stamping, ensuring the washer remains flat and does not distort under bolt load.
The zinc‑plated finish with yellow chromate conversion provides sacrificial protection against red rust for over 200 hours in salt spray testing (ASTM B117). This is essential for trucks that operate in road‑salt environments. Aftermarket washers often have thin or uneven plating, leading to rust that can seize the bolt or weaken the joint.
Genuine Shacman washers also feature a clean, smooth surface without sharp burrs. The outer edge is slightly radiused to avoid cutting into the technician’s fingers or damaging adjacent seals.
Shacman’s flat washers are produced on high‑speed progressive stamping presses with carbide dies, ensuring consistent inner and outer diameters, thickness, and flatness. Each washer is 100% inspected for burrs using automated vision systems. Random samples are checked with a micrometer and hardness tester.
A flatness test is performed on a granite surface plate using a feeler gauge; the washer must not exhibit more than 0.05 mm deviation. The zinc plating thickness is verified using an X‑ray fluorescence gauge to ensure at least 5 µm of zinc. Salt spray testing is performed on batch samples; no red rust is permitted after 200 hours.
Dimensional conformance to ISO 7089 Class A is verified: ID tolerance H13, OD tolerance h14. Only washers that pass all tests receive the Shacman OEM approval and the part number 90014040007. They are then cleaned, lightly oiled, and sealed in poly bags.
Shacman installs sample washers on test X5000 trucks operating in mining, logging, and long‑haul applications. After one million kilometers, the washers are removed and inspected. No rust, embedment, or deformation is observed. The washer consistently maintains its shape and protects the underlying material, confirming a service life exceeding 1.5 million kilometers.
Installing the 90014040007 flat washer is simple: place the washer between the bolt head (or nut) and the workpiece. Ensure the washer is centered on the bolt. Tighten the bolt to the specified torque. Do not use a washer that is cracked, bent, or heavily corroded. Always use a new washer when a joint is disassembled, as the old washer may have taken a compressive set or become damaged.
This flat washer is compatible with M12 bolts (thread pitch 1.75 mm) and is used in many locations on the Shacman X5000: engine mounts, transmission mounts, suspension links, and cab brackets. Always verify the OEM number 90014040007 before ordering. The washer is sold individually, but Shacman recommends bulk packs for fleet maintenance.
During routine maintenance, inspect flat washers for signs of rust, cracking, or distortion. If a washer is missing, always install a new genuine one. A missing washer can allow the bolt head to embed into the material, reducing clamp load and causing the bolt to loosen under vibration. If the washer is heavily rusted, replace it – the rust can flake off and contaminate the joint.
When rebuilding an engine or chassis, always replace all washers with new genuine parts. The cost of a washer is minimal compared to the cost of a failed joint. Keep a bulk supply of 90014040007 washers in your service truck.
A flat washer may seem trivial, but its absence or failure can cause catastrophic joint failure. Without a washer, the bolt head can embed into soft aluminum or plastic, losing preload and allowing the bolt to loosen. A loose engine mount can cause drivetrain misalignment, vibration, and eventual component failure. The genuine Shacman washer ensures that the clamping force is evenly distributed, maintaining bolt preload for the life of the joint.
In suspension systems, a missing washer can lead to a nut loosening, causing a wheel alignment issue or even a wheel detachment. The 90014040007 washer provides the necessary bearing surface to prevent such failures.
Fleet data shows that using genuine flat washers reduces fastener‑related failures by over 85% and eliminates corrosion‑induced bolt seizure. The washer is a low‑cost component that provides massive protection.
Aftermarket flat washers often have inconsistent thickness, leading to uneven load distribution. They may lack proper heat treatment, causing them to deform under bolt torque. The plating may be thin or incomplete, leading to rust that can seize the bolt. Genuine Shacman washers are stamped from certified steel, heat‑treated, and zinc‑plated to OE specifications.
Genuine washers also have the correct inner diameter to fit the bolt shank without slop, ensuring centering. Aftermarket washers may be oversized, allowing the washer to shift off‑center. Using OEM parts maintains your vehicle’s warranty and ensures that all bolted joints meet Shacman’s original design criteria.
For fleets, this reduces the risk of fastener loosening and corrosion. The genuine washer is a small investment that protects a much larger asset.
The cost of a genuine flat washer is negligible (often less than $0.20 per piece), but the cost of a failed joint due to a missing or corroded washer can be enormous: an engine falling off its mounts, a suspension link breaking, or a wheel falling off. For a fleet of 50 X5000 trucks, using genuine 90014040007 washers in all critical joints reduces fastener‑related failures by over 90%.
Aftermarket washers may need replacement every 200,000 km due to rust or deformation. Genuine Shacman washers last the life of the vehicle (1.5 million km+), providing the lowest total cost of ownership. The improved corrosion resistance also reduces the risk of seized bolts, which can add significant labor time to repairs.
Moreover, correctly installed washers ensure that torque values are accurate, preventing under‑torquing (loosening) or over‑torquing (yield). The genuine washer is a small price for peace of mind.
Authorized Shacman parts distributors stock the 90014040007 flat washer worldwide. Washers are supplied in sealed poly bags with the OEM number and batch code for traceability. Bulk packs of 100, 500, or 1,000 washers are available for large fleet maintenance depots. Just‑in‑time delivery options help minimize inventory while ensuring critical fasteners are available for scheduled repairs.
Always purchase from approved dealers to avoid counterfeit products. Genuine Shacman washers can be verified by the uniform zinc finish, the cleanly punched edges, and the laser‑etched part number on the bag. The washer also has a distinct weight and “ring” when tapped – counterfeit washers are often dull and lightweight. For large fleets, Shacman offers consignment stock programs to ensure immediate availability without upfront investment. Contact your regional distributor for details.
The Shacman OEM 90014040007 Flat Washer is a small but essential component that ensures every bolted joint on your X5000 remains tight, protected, and corrosion‑resistant. By providing a precise, hardened, and zinc‑plated bearing surface, this genuine part prevents fastener embedment, distributes clamp load, and eliminates rust‑induced seizure. For Shacman X5000 heavy‑duty trucks, choosing the original 90014040007 flat washer is a simple, low‑cost decision that delivers long‑term reliability, safety, and operational efficiency. Trust only genuine Shacman – every washer, every joint, every kilometer.
