NAS143-12 - Textron Aviation OEM Flat Washer for Beech Baron, Bonanza, and King Air Airplanes

NAS143-12 – Textron Aviation OEM Flat Washer for Baron, Bonanza, and King Air Airplanes

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Overview

The NAS143-12 is a National Aerospace Standard, flight-critical flat washer, specified by Textron Aviation for use in primary structural applications on a wide range of Beechcraft aircraft. This is not a common washer; it is a precision-manufactured component engineered to distribute the immense clamping force of high-strength structural bolts, particularly in major assemblies like wing spar and engine mount attachments. Fabricated from high-quality carbon steel and plated for corrosion resistance, the NAS143-12 provides a perfectly flat, hardened bearing surface essential for the integrity and fatigue life of a bolted joint.

Key Features

• High-Strength Carbon Steel: Manufactured from a specified carbon steel alloy, providing the high compressive strength necessary to withstand extreme clamp loads from torqued structural bolts without cupping, warping, or deforming.
• Precision Dimensions: As a certified NAS-standard part, it is manufactured to tighter tolerances for flatness, concentricity, and thickness than standard hardware, ensuring a perfect fit and consistent performance.
• Corrosion-Resistant Plating: Plated with a durable cadmium finish (typically Type II, Class 2). This protective coating provides robust protection against environmental corrosion, ensuring the long-term integrity of the entire structural joint.
• Optimized Bearing Surface: Provides a smooth, hard, and perfectly flat bearing surface for the nut or bolt head to turn against during tightening. This normalizes friction and allows for more accurate and repeatable torque application, which is critical for achieving correct bolt preload.
• Preferred Substitute: In many Beechcraft applications, the NAS143-12 is the preferred or superseding part for the MS20002-12 washer, often due to its tighter tolerances or specific engineering requirements for critical joints.

Technical Specifications

• Standard: NAS143 (Washer, Flat, Plain)
• Full Part Number: NAS143-12
• Alternate Beech Required Replacement Part Number: MS20002-12
• Component Type: Plain Flat Structural Washer
• Material: Carbon Steel
• Finish: Cadmium Plated, Type II, Class 2
• Nominal Screw/Bolt Size: 3/4 inch
• Dimensions:
  • Inside Diameter (I.D.): 0.766 inches
  • Outside Diameter (O.D.): 1.375 inches
  • Thickness: 0.063 inches

Aircraft Compatibility

The NAS143-12 is a critical structural hardware component specified for use on some of the most successful piston and turboprop aircraft ever produced.

• Primary Aircraft Models:
  • Beechcraft Baron: 55, 58, G58 Series
  • Beechcraft Bonanza: 33, 35, 36, G36 Series
  • Beechcraft King Air: 90, 100, 200 Series

Applications

The NAS143-12 washer is a fundamental component of a properly engineered bolted structural joint:

• Wing Spar Attachments: Used under the heads of massive wing spar bolts and/or the corresponding nuts to distribute loads into the wing and fuselage fittings.
• Engine Mounts: A common component in engine mounting hardware stacks to distribute loads onto the firewall or engine mount structure.
• Landing Gear: Utilized in primary landing gear attachment points and other high-load assemblies where load distribution is critical.

Why Choose NAS143-12?

A washer in a structural joint is an engineered spring that helps maintain bolt preload. Using a genuine NAS143-12 washer guarantees that the part has the correct material strength, hardness, and dimensional stability to perform this function reliably under immense loads. Substituting with a non-certified or incorrect standard washer can be dangerous; a softer washer can deform, leading to a loss of preload and allowing movement in the joint, which can cause catastrophic fatigue failure. For the critical structural joints of your aircraft, trust only certified NAS hardware as specified by the manufacturer.

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• Meta Title: NAS143-12 Structural Flat Washer for Beechcraft | 3/4" | Airparts.aero
• Meta Description: Purchase genuine NAS143-12, a National Aerospace Standard flat washer for 3/4" bolts. A flight-critical structural component for Beechcraft Baron, Bonanza, and King Air wing spar and engine mount applications.
• SEO and Plain Text Keywords: NAS143-12, NAS143, flat washer, aircraft washer, 3/4 washer, structural washer, Beechcraft parts, King Air parts, Bonanza parts, Baron parts, military standard hardware, AN washer, cadmium plated washer, Textron Aviation parts, Airparts.aero.

Order Your NAS143-12 Washers Now

Ensure the integrity of every critical bolted connection with certified aerospace hardware. Visit Airparts.aero to order your NAS143-12 structural flat washers today.

SEO-Enhanced Addendum

The NAS143-12 flat washer plays a crucial role in achieving the proper clamp load in a structural joint. When a high-strength bolt is torqued, a significant portion of the applied energy is consumed by friction. The smooth, hardened, and plated surface of the NAS143-12 provides a consistent and predictable frictional interface for the turning nut or bolt head. This consistency allows the mechanic's applied torque to be more accurately converted into the desired bolt tension (preload or "stretch"), which is what actually holds the joint together. While dimensionally similar to the MS20002-12, the NAS143 often carries a more stringent specification for material and tolerance, making it the required choice for specific flight-critical joints as determined by Textron Aviation engineers.

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.