MS20002-12 - Textron Aviation OEM Flat Washer 3/4 Size

MS20002-12 – Textron Aviation OEM Flat Washer 3/4 Size

Available now on the Airparts.aero Marketplace.

Overview

The MS20002-12 is a military-standard plain flat washer, engineered for use in a wide variety of aerospace structural and general-purpose applications. Manufactured in strict accordance with the MS20002 specification, this washer is designed to be used under the head of a bolt or under a nut to distribute the clamping force over a larger surface area and to prevent damage to the mating component. Fabricated from high-quality carbon steel and plated for corrosion resistance, the MS20002-12 is a fundamental piece of certified hardware essential for creating strong, reliable bolted joints.

Key Features

• Uniform Load Distribution: The primary function is to distribute the pressure of a nut or bolt head evenly over a wider surface area. This prevents the fastener from galling or digging into the surface of softer materials like aluminum alloy.
• High-Strength Carbon Steel: Manufactured from a specified carbon steel alloy, providing the necessary compressive strength to withstand high clamping forces without deforming or cupping.
• Corrosion-Resistant Plating: Plated with a durable cadmium finish per specification QQ-P-416, Type I, Class 3. This plating provides excellent protection against corrosion, ensuring the integrity and longevity of the entire bolted joint.
• Precise Dimensions: As a certified MS-standard part, it is manufactured to tight tolerances for inner diameter, outer diameter, and thickness, ensuring a proper fit and consistent performance.
• Hardened Surface: Provides a smooth, hard, and flat bearing surface for the nut or bolt head to turn against during tightening, which allows for more accurate and consistent application of torque.

Technical Specifications

• Standard: MS20002 (Washer, Flat, Plain)
• Full Part Number: MS20002-12
• Alternate Part Number: NAS143-12
• Component Type: Plain Flat Washer
• Material: Carbon Steel
• Finish: Cadmium Plated, Type I, Class 3
• Nominal Screw/Bolt Size: 3/4 inch
• Dimensions:
  • Inside Diameter (I.D.): 0.766 inches
  • Outside Diameter (O.D.): 1.438 inches
  • Thickness: 0.091 inches

Aircraft Compatibility

The MS20002-12 is a universal hardware component used across all categories of aircraft, from general aviation to large commercial and military platforms, including those manufactured by Textron Aviation. Its use is specified wherever a 3/4-inch plain flat washer is required by the manufacturer's engineering drawings or parts catalogs.

• Common Applications:
  • Structural Assemblies: Used in major airframe structural joints in conjunction with AN bolts and nuts.
  • Engine Mounts: A common component in engine mounting hardware stacks to distribute loads onto the firewall or engine mount structure.
  • Landing Gear: Utilized in landing gear attachment points and other high-load assemblies.
  • General Fastening: Provides spacing or bearing surface for countless other bolted connections throughout the aircraft.

Applications

The MS20002-12 washer is a fundamental component of a properly engineered bolted joint:

• Bearing Surface Provision: Creates a smooth, even surface for the fastener, which is critical when bolting through composite materials or onto uneven surfaces.
• Damage Prevention: Protects the surface of the airframe structure from being damaged by the turning motion of the nut or bolt during tightening.
• Hole Coverage: Can be used to span oversized or elongated holes, providing proper support for the fastener.

Why Choose MS20002-12?

A washer is not just a simple spacer; it is an engineered component of a bolted joint system. Using a genuine MS20002-12 washer guarantees that the part has the correct material strength to handle high clamp loads and a certified plating to resist corrosion. Substituting with a non-certified, commercial-grade washer can be dangerous, as they may deform under load, leading to a loss of bolt preload, or they may corrode at an accelerated rate, compromising the integrity of the entire joint. For a safe and airworthy repair, trust only certified MS-standard hardware.

Order Your MS20002-12 Washers Now

Ensure the integrity of every bolted connection with certified aerospace hardware. Visit Airparts.aero to order your MS20002-12 flat washers today.

The MS20002-12 flat washer plays a critical role in achieving and maintaining the proper preload in a structural bolted joint. When torque is applied to a nut, a significant portion of that energy is lost to friction between the nut and the surface it's turning against. By providing a hardened, smooth, and predictable surface, the MS20002-12 washer helps to normalize this friction, which allows the applied torque to be more consistently converted into the desired bolt tension or "stretch." This consistency is key to ensuring that every fastener in a joint is carrying its designed share of the load, which is fundamental to the fatigue life and overall safety of the structure

Applicable Textron Aircraft

• Baron Series B55, E55, 58 or G58
• Bonanza 36
• Bonanza F33, G33, F33A or F33C
• Citation Latitude
• Citation Sovereign or Sovereign+
• King Air 100
• King Air 350 or 350C FM-1 to FM-35
• King Air 360, 350i or 350C FM-36 & on
• King Air B200, B200T, B200C or B200CT
• King Air B200GT or B200CGT
• King Air C90, C90A, C90GT or E90
• King Air C90GTi Series

List not comprehensive, may be applicable on other models.

Note: Always verify the correct washer part number (including material and class) 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.