NAS143-10 - Textron Aviation OEM Washer

NAS143-10 – Textron Aviation OEM Washer

Available now on the Airparts.aero Marketplace.

Overview

The NAS143-10 is a National Aerospace Standard, flight-critical flat washer, specified by Textron Aviation for use in primary structural applications on a wide range of aircraft. This is not a common washer; it is a precision-manufactured, load-bearing component engineered to distribute the immense clamping force of high-strength 5/8-inch structural bolts. Fabricated from high-quality, heat-treated carbon steel and plated for exceptional corrosion resistance, the NAS143-10 provides a perfectly flat, hardened bearing surface essential for the integrity and fatigue life of any critical bolted joint, such as those found in landing gear and primary airframe structures.

Key Features

• High-Strength Carbon Steel: Manufactured from a specified carbon steel alloy, which is then heat-treated (quenched and tempered) to achieve a high Rockwell hardness. This ensures the washer possesses the immense compressive strength required to withstand extreme clamp loads from torqued structural bolts without cupping, yielding, or deforming.
• Precision-Ground Surfaces: The bearing surfaces of the washer are precision-ground to be exceptionally flat and parallel, with a controlled surface finish. This is critical for providing a uniform bearing surface, which prevents localized stress concentrations on the softer airframe material beneath it.
• Corrosion-Resistant Plating: Plated with a durable cadmium finish per Type II, Class 2 specifications. This protective coating provides robust, sacrificial corrosion protection for the underlying high-strength steel, ensuring the long-term integrity of the entire structural joint.
• NAS Certified Standard: As a certified National Aerospace Standard part, it is manufactured to tighter tolerances for flatness, concentricity, and thickness than standard hardware, ensuring a perfect fit and consistent, reliable performance in critical applications.

Technical Specifications

• Standard: NAS143 (Washer, Flat, Plain, Undrilled)
• Full Part Number: NAS143-10
• Component Type: Plain Flat Structural Washer
• Material: Heat-Treated Carbon Steel
• Finish: Cadmium Plated, Type II, Class 2
• Nominal Screw/Bolt Size: 5/8 inch
• Dimensions:
  • Inside Diameter (I.D.): 0.641 inches
  • Outside Diameter (O.D.): 1.125 inches
  • Thickness: 0.063 inches

Aircraft Compatibility

The NAS143-10 is a universal structural hardware component specified for use on high-load joints across numerous aircraft platforms, including many manufactured by Textron Aviation (Cessna, Beechcraft). Its use is dictated by the manufacturer's engineering drawings wherever a structural washer for a 5/8-inch bolt is required.

• Common Applications:
  • Landing Gear Assemblies: Used in the main attachment points, trunnions, and shock strut hardware stacks.
  • Primary Airframe Structure: Utilized in major structural joints, such as wing-to-fuselage and empennage-to-fuselage attachments.
  • Engine Mounts & Pylons: A common component in the mounting hardware for large piston and turbine engines.

Applications

The NAS143-10 washer is a fundamental component of a properly engineered bolted structural joint:

• Bearing Surface Provision: Creates a smooth, hardened bearing surface, which is critical when bolting through softer materials like aluminum alloys or composite structures.
• Load Distribution: Its primary function is to distribute the immense pressure of a torqued nut or bolt head evenly over a wider surface area, preventing damage to the airframe structure.
• Torque Accuracy: Provides a consistent and predictable surface for the nut or bolt head to turn against, which is essential for converting applied torque into the correct bolt tension (preload).

Why Choose NAS143-10?

In a structural joint, the washer is an engineered component designed to manage immense forces. Using a genuine NAS143-10 washer guarantees that the part has the certified material hardness, strength, and dimensional stability to perform its function without failure. Substituting with a non-certified, commercial-grade washer is extremely dangerous, as it may deform under load, leading to a critical loss of bolt preload, which can allow the joint to slip or fail from fatigue. For a safe and airworthy repair, trust only certified NAS hardware.

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• Meta Title: NAS143-10 Structural Flat Washer for 5/8" Bolt | Cadmium Steel | Airparts.aero
• Meta Description: Purchase genuine NAS143-10, a National Aerospace Standard flat washer. This cadmium-plated, heat-treated steel washer is designed for 5/8" bolts in flight-critical aerospace structural applications.
• SEO and Plain Text Keywords: NAS143-10, NAS143, flat washer, aircraft washer, 5/8 washer, structural washer, military standard hardware, AN washer, cadmium plated washer, Textron Aviation parts, Airparts.aero.

Order Your NAS143-10 Washers Now

Ensure the integrity of every critical bolted connection with certified aerospace hardware. Visit Airparts.aero to order your NAS143-10 structural flat washers today.

SEO-Enhanced Addendum

The NAS143-10 flat washer is a key enabler for achieving and maintaining the correct bolt preload. Preload is the tension created in a bolt when it is stretched elastically during torquing, and it is this tension that provides the clamping force holding a joint together. A significant portion of the torque applied by a mechanic is consumed by friction under the turning nut or bolt head. The smooth, hard, and plated surface of the NAS143-10 normalizes this friction, making it a predictable variable in the torque-tension relationship. This allows the torque value specified in the maintenance manual to accurately produce the required preload. A washer that is too soft or has a rough surface would create unpredictable friction, resulting in an improperly loaded joint that could be susceptible to catastrophic fatigue failure.

Note: This is a flight-critical structural component. Always verify the correct washer part number from the applicable aircraft maintenance manual or Illustrated Parts Catalog (IPC). Ensure all components of a bolted joint (bolt, washer, and nut) are of the correct specification and are properly installed and torqued according to the manufacturer's procedures.