81784-12-32 - Textron Aviatoin OEM Double Hex Flanged Number 10 Bolt For King Air

81784-12-32 – Textron Aviation OEM Double Hex Flanged Bolt For King Air

Available now on the Airparts.aero Marketplace.

Overview

The Textron Aviation 81784-12-32 is a genuine OEM, flight-critical, 12-point flanged structural bolt, engineered for use in the primary airframe structures of the Beechcraft King Air. This is not a standard fastener; it is a proprietary, high-performance component designed to create bolted joints of exceptional strength and fatigue resistance. It features a "double hex" (12-point) head for high-torque application and an integral flange that acts as a built-in washer. Fabricated from ultra-high-strength steel, this bolt is essential for maintaining the structural integrity of the aircraft in the most demanding, high-load applications.

Key Features

• 12-Point Double Hex Head: The 12-point head design allows for higher torque to be applied compared to a standard 6-point hex head. This enables mechanics to achieve the precise, high clamping force (preload) required for critical structural joints, while providing more numerous points of engagement for tooling in tight spaces.
• Integral Flange: Features a built-in flange at the base of the head. This integral washer face provides a larger bearing surface to distribute the immense clamping force evenly, protecting the airframe structure from damage and preventing the loss of preload.
• Ultra-High-Strength Steel Alloy: Manufactured from a premium VAR (Vacuum-Arc Remelt) steel alloy and heat-treated to an extremely high tensile strength. This provides the robust performance needed to withstand the complex tensile, shear, and fatigue loads experienced in primary airframe structures.
• Superior Corrosion Protection: Coated with a high-performance plating system (such as diffused nickel-cadmium) that provides exceptional corrosion resistance and prevents hydrogen embrittlement, a critical consideration for high-strength steel fasteners.
• Genuine Textron OEM Part: As a genuine factory component, it guarantees conformance to the exact material, heat treatment, NDT inspection, and dimensional specifications required by the King Air's original Type Certificate.

Technical Specifications

• Part Number: 81784-12-32
• Component Type: 12-Point Structural Flange Bolt
• Material: Ultra-High-Strength Steel Alloy
• Finish: High-Performance Corrosion-Resistant Plating
• Head Style: 12-Point (Double Hexagon) with Integral Flange
• Thread Specification: Fine Thread Series (UNJF) - Exact size is proprietary and must be verified against the IPC.
• Dimensions: Proprietary to Textron Aviation. The part number designates a specific diameter and length combination for a precise application.
• Certification: FAA Production Approval with full material and NDT traceability.

Aircraft Compatibility

The 81784-12-32 is a specialized structural bolt for specific, high-load applications on the Beechcraft King Air family of aircraft. Its use is mandatory as specified by the manufacturer's documentation.

• Primary Aircraft Models:
  • Beechcraft King Air (various models within the 90, 100, 200, and 300 series)
• Common Applications:
  • Wing-to-Fuselage Attach Points
  • Main Landing Gear Structural Fittings
  • Engine Mount-to-Firewall Structures
  • Other primary airframe splice joints.

Applications

This proprietary bolt is reserved for the most demanding structural connections on the aircraft:

• Primary Structure Assembly: Used to join major, load-bearing structural components where joint integrity is absolutely essential for safety of flight.
• Fatigue-Critical Joints: The high, uniform preload achieved with this bolt significantly increases the fatigue life of the joint.
• Mandatory Replacement: Often a life-limited part that must be replaced in accordance with the aircraft's maintenance schedule or after specific events.

Why Choose 81784-12-32?

The safety of an aircraft is directly tied to the integrity of its primary structure. The 81784-12-32 is an engineered solution for the highest-stress joints on the King Air. Using a genuine Textron Aviation OEM part is the only way to ensure you are installing a fastener with a known, certified, and traceable history, made from the exact materials required to handle the immense flight loads. The use of any non-certified or standard hardware in this application is strictly prohibited and would catastrophically compromise the safety of the aircraft.

Website Metadata

• Meta Title: 81784-12-32 Textron King Air Structural Bolt | 12-Point Flange Bolt | Airparts.aero
• Meta Description: Purchase the genuine Textron Aviation 81784-12-32, a flight-critical, 12-point structural flange bolt. A proprietary, high-strength OEM component for Beechcraft King Air primary structures.
• SEO and Plain Text Keywords: 81784-12-32, Textron Aviation parts, King Air parts, structural bolt, 12-point bolt, flange bolt, aircraft bolt, high-strength hardware, OEM Beechcraft parts, Airparts.aero.

Order Your 81784-12-32 Structural Bolts Now

Ensure the structural integrity of your aircraft with genuine, factory-certified, flight-critical hardware. Visit Airparts.aero to order your Textron Aviation 81784-12-32 bolts today.

SEO-Enhanced Addendum

The design of the 81784-12-32 12-point flanged head is a deliberate engineering choice to maximize the performance of a bolted joint. The primary factor in a joint's fatigue life is achieving a very high, very accurate preload (clamping force). The 12-point head design allows a socket or wrench to apply torque more evenly and at higher values than a standard 6-point hex head, reducing the risk of rounding off the corners. The integral flange then distributes this high clamp load over a large area, preventing the bolt head from damaging the airframe structure and ensuring the preload is not lost due to material deformation. This combination allows engineers to design stronger, lighter, and more durable airframe joints.

Textron Notes

ACCEPTABLE TO USE P/N'S 81784-12-32 AND 132777-1 AS ALTERNATES WITHIN THE FOLLOWING INSTALLATIONS ONLY: 90-100003 AND 101-100002.

Applicable Textron Aircraft

• 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: This is a flight-critical structural component, often with a specific life limit and mandatory replacement schedule. It must only be installed where specified by the aircraft manufacturer's maintenance manual. Installation requires the use of a calibrated torque wrench and a new, corresponding high-strength nut, torqued to the precise value and procedure (which may include multiple stages) specified in the manual. All maintenance actions involving this part must be documented in the aircraft's permanent records.