4D0003-20P – Aerospace Washer
Available now on the Airparts.aero Marketplace.
Overview
The 4D0003-20P is a proprietary, high-performance washer engineered for specific applications within aerospace and defense platforms. This is not a standard hardware-store washer; it is a precision-manufactured component whose specific alloy, dimensions, and finish are dictated by a prime manufacturer's engineering drawings to meet unique performance requirements. Often used in dynamic assemblies, this washer is designed to provide precise spacing, surface protection, and consistent load distribution in a bolted or fastened joint. As a fully traceable aerospace component, it guarantees the material integrity and dimensional accuracy required for flight-critical applications.
Key Features
- Proprietary Engineering Design: A custom-designed component whose specific characteristics are engineered to meet the demands of a particular application, such as high-temperature resistance, specific electrical conductivity, or compatibility with exotic materials.
- Precision Machined Tolerances: Manufactured to exceptionally tight tolerances for flatness, concentricity, and thickness. This precision is essential for maintaining alignment and providing a uniform bearing surface in high-performance assemblies.
- Application-Specific Material: Fabricated from a specified aerospace-grade alloy (such as a particular stainless steel, bronze, or nickel-based superalloy) chosen for its unique combination of strength, corrosion resistance, and thermal stability.
- Full Traceability: Supplied with a complete, unbroken chain of traceability documentation back to the original OEM-approved source. This certification is a non-negotiable requirement for installing hardware on type-certified aircraft and rotorcraft.
Technical Specifications
- Part Number: 4D0003-20P
- Component Type: Proprietary Flat / Special Purpose Washer
- Material: Aerospace-Grade Alloy (Exact specification is proprietary and must be verified against engineering drawings).
- Finish: Proprietary corrosion-resistant plating or passivation.
- Dimensions: The "-20P" suffix designates a specific inner diameter, outer diameter, and thickness combination as defined by the OEM standard. Verification against the relevant Illustrated Parts Catalog (IPC) is required.
- Certification: Supplied with a Certificate of Conformance (C of C) and full traceability.
Aircraft Compatibility
Proprietary washers like the 4D0003-20P are designed for a specific location on a specific aircraft or sub-assembly. They are not interchangeable with standard AN or MS washers.
- Common Applications (General for this type of hardware):
- Dynamic Assemblies: Used in flight control systems, landing gear linkages, and actuator attachment points where precise spacing and wear characteristics are critical.
- Engine & Transmission Mounts: Utilized in engine and transmission hardware stacks to provide proper spacing and load distribution.
- Rotorcraft Systems: Often found in main and tail rotor head assemblies, swashplates, and other dynamic components unique to helicopters.
Applications
This proprietary washer is specified when a standard washer cannot meet the engineering demands of the joint:
- Precision Spacing (Shimming): Used to achieve a precise axial distance or clearance between two components.
- Bearing Surface Protection: Provides a hardened, smooth surface to prevent a nut or bolt head from damaging a softer structural material like aluminum or composite.
- Load Distribution: Spreads the high clamping force of a fastener over a larger area to reduce stress on the underlying material.
Why Choose 4D0003-20P?
In high-performance aircraft, the function of every component is calculated. A simple washer may also be acting as a specific shim, a thermal barrier, or a galvanic corrosion insulator. The 4D0003-20P is an engineered solution for one of these unique challenges. Using a genuine, traceable part is the only way to ensure that the component has the correct material properties and exact dimensions required by the aircraft's certified design. Substituting with a standard washer of similar size could alter joint spacing or introduce an incorrect material, leading to unforeseen stress, corrosion, or failure of the assembly.
Order Your 4D0003-20P Washers Now
Ensure the integrity and safety of your aircraft with genuine, fully traceable OEM hardware. Visit Airparts.aero to order your 4D0003-20P proprietary washers today.
The designation of a proprietary part number like 4D0003-20P signifies that the component's performance is governed by an OEM's internal source control drawing (SCD) rather than a public military or industry standard. This drawing contains the "secret recipe" for the part—the specific alloy, any required heat treatments, the precise dimensional tolerances (often much tighter than standard hardware), surface finish requirements, and mandatory inspection procedures. The part's function may be so integral to the performance of a larger assembly that its specific characteristics are considered a trade secret. Therefore, the accompanying traceability paperwork is as important as the part itself, as it is the only proof that the component was manufactured in exact accordance with this proprietary, flight-critical design.
Note: This is a flight-critical component. It must only be used in the application specified by the aircraft manufacturer's maintenance and parts manuals. Substitution with any other part, even of similar dimensions, is strictly prohibited unless explicitly authorized by the OEM or an approved engineering disposition.
