95-110021 - Textron Aviation OEM Spar Fitting Flat Washer

95-110021 – Textron Aviation OEM Spar Fitting Flat Washer

Available now on the Airparts.aero Marketplace.

Overview

The Textron Aviation 95-110021 is a genuine OEM, flight-critical spar fitting washer, an indispensable structural component for the wing-to-fuselage attachments on Beechcraft Bonanza and Baron series aircraft. This is not a standard washer; it is a precision-manufactured, load-bearing component whose material properties and dimensional tolerances are dictated by Textron's original engineering specifications. Fabricated from heat-treated, high-tensile steel, its primary function is to provide a perfectly flat, hardened bearing surface for the main spar attachment bolts. This ensures that the immense clamping forces required to secure the wing are distributed evenly, preventing stress concentrations and maintaining the fatigue life of the entire airframe structure.

Key Features

• Primary Structural Component: Specifically designed for the main wing spar attachment joint, which transfers the entire aerodynamic lift load of the wing, as well as positive and negative G-loads, into the primary fuselage structure.
• Heat-Treated Steel Alloy: Manufactured from a high-strength steel alloy (typically 4130 or 4140) that is quenched and tempered to achieve a specific Rockwell hardness. This ensures the washer can withstand immense compressive loads without yielding, coining, or deforming.
• Precision-Ground Surfaces: The bearing surfaces are precision-ground to be exceptionally flat and parallel, with a controlled surface finish. This is essential for providing a uniform bearing surface and for normalizing the friction between the turning nut/bolt and the airframe structure.
• Corrosion-Resistant Plating: Plated with a durable cadmium finish per QQ-P-416, Type II, Class 2. This plating provides sacrificial corrosion protection for the underlying steel and prevents galling between the fastener and the washer.
• Genuine Textron OEM Part: As the genuine factory component, it guarantees conformance to the proprietary material, heat treatment, dimensional, and plating specifications required by the aircraft's Type Certificate. For a component this critical, there is no substitute.

Technical Specifications

• Part Number: 95-110021
• Component Type: Structural Wing Spar Fitting Flat Washer
• Material: Heat-Treated High-Tensile Steel Alloy (e.g., 4130/4140)
• Finish: Cadmium Plated, Type II, Class 2
• Nominal Screw/Bolt Size: 3/4 inch
• Dimensions:
  • Inside Diameter (I.D.): 0.765 inches
  • Outside Diameter (O.D.): Proprietary to Textron Aviation.
  • Thickness: Proprietary to Textron Aviation.
• Hardness: Specified Rockwell hardness range to ensure proper strength.
• Certification: FAA Production Approval with full material and process traceability.

Aircraft Compatibility

The 95-110021 is the specified OEM washer for the wing spar attachment on some of the most successful and legendary piston aircraft ever built.

• Primary Aircraft Models:
  • Beechcraft Bonanza: F33A, F33C, V35B, A36 Series
  • Beechcraft Baron: 95B55, E55, 58, 58P Series
  • Beechcraft King Air: B90, C90, E90, A100, B99, B60 Series
    

Applications

The 95-110021 has a singular, profoundly important application:

• Wing Spar Attachment Joint: Serves as the critical interface between the main wing spar attachment bolt/nut and the wing spar or fuselage fitting. It distributes the clamping force, provides a smooth bearing surface for torquing, and prevents damage to the softer aluminum airframe structure.
• Mandatory Inspection & Replacement: This component must be meticulously inspected for any signs of cracking, corrosion, galling, or deformation any time the wing bolts are removed for scheduled inspection or maintenance. It is a mandatory replacement item if any defects are found.

Why Choose 95-110021?

The wing-to-fuselage joint is the most critical structural connection on the aircraft. Its failure results in catastrophic structural separation. The 95-110021 washer is an engineered and load-bearing part of this system. Using a genuine Textron Aviation OEM part is the only way to ensure the component has the certified material strength, hardness, and precise dimensions to handle the calculated flight loads. The use of any uncertified hardware in this location would be a gross violation of safety and airworthiness standards.

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• Meta Description: Purchase the genuine Textron Aviation 95-110021, a flight-critical, high-strength steel washer for the wing spar attachment on Beechcraft Bonanza and Baron aircraft.
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Order Your 95-110021 Wing Spar Washers Now

Ensure the structural integrity of your aircraft with genuine, factory-certified, flight-critical hardware. Visit Airparts.aero to order your Textron Aviation 95-110021 wing spar fitting washers today.

SEO-Enhanced Addendum

The 95-110021 washer is a critical element in achieving and maintaining bolt preload in the wing joint. When the massive 3/4-inch spar bolt is torqued, the goal is to stretch the bolt elastically, creating a powerful clamping force on the joint. A significant portion of the applied torque (up to 90%) is used simply to overcome friction. The hardened, smooth, and plated surface of the 95-110021 provides a known, consistent coefficient of friction for the turning nut to act against. This allows the mechanic's torque wrench reading to be a more accurate representation of the actual tension achieved in the bolt. If a softer, uncertified washer were used, it would gall and deform, creating unpredictable friction. This would result in an inaccurate and likely insufficient preload, which could allow the joint to slip and ultimately fail from fatigue.

Note: This is a flight-critical structural component. It must only be used in the application specified by the Textron Aviation maintenance and structural repair manuals. Installation is part of a major maintenance procedure and must be performed by a certified A&P mechanic with experience in heavy structural aircraft maintenance. All procedures, including fastener lubrication and torque application, must be followed with absolute precision.