DHS1432-15GG - Textron Aviation OEM Hex Close‑Tolerance Steel Bolt

DHS1432-15GG – Textron Aviation OEM High-Strength Close-Tolerance Bolt

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Overview

The DHS1432-15GG is a flight-critical, primary structural fastener, supplied as a genuine Textron Aviation Original Equipment Manufacturer (OEM) part for use on Hawker business jets. This is not a general-purpose AN bolt; it is a high-strength, close-tolerance bolt specifically engineered for use in major structural joints subjected to high shear loads. Its two defining characteristics are its very high tensile strength (typically 180-200 ksi) and a shank diameter that is manufactured to extremely tight tolerances to create an interference fit.

This interference fit, where the bolt shank is fractionally larger than the hole, is a critical design feature. It ensures zero movement or slippage within the joint, provides for the most efficient transfer of shear loads, and dramatically increases the fatigue life of the connection. This bolt is a cornerstone of the aircraft's structural integrity, used in locations such as wing-to-fuselage attachments and landing gear fittings.

Key Features

• Genuine Textron Aviation (Hawker) OEM Part: Guarantees the part is fabricated to the exact, non-negotiable material, heat treatment, and dimensional specifications for a primary structural component.

• Close-Tolerance Shank: The shank diameter is precision-ground to extremely tight tolerances (e.g., +0.0005"/-0.0000") to produce an interference fit when installed in a correctly prepared hole.

• 180-200 ksi High-Tensile Strength: Manufactured from an ultra-high-strength alloy steel (such as H-11 or 4340) and heat-treated to achieve a tensile strength far exceeding that of standard AN or MS bolts.

• Designed for Critical Shear-Loaded Joints: The interference fit is specifically designed to transfer shear loads through bearing and friction, eliminating joint slippage and enhancing fatigue performance.

• Improves Joint Fatigue Life: The compressive pre-stress induced by the interference fit, combined with the elimination of fretting, significantly increases the fatigue life of the surrounding structure.

• Drilled Head for Positive Locking: The hex head is typically drilled for the installation of safety wire, providing a positive locking mechanism.

Technical Specifications

• Part Number: DHS1432-15GG

• Component Type: Close-Tolerance Structural Bolt

• OEM Authority: Textron Aviation (Hawker)

• Material: Ultra-High-Strength Alloy Steel (e.g., H-11, 4340), heat-treated to 180-200 ksi.

• Finish: Cadmium Plated (typically via a low-embrittlement vacuum deposition process) or other OEM-specified protective coating.

• Shank Tolerance: Per DHS1432 engineering drawing, designed for an interference fit.

• Diameter: Per -15 size code (e.g., 1/4 inch). Must be confirmed by OEM documentation.

• Length/Grip: Per -15GG size and grip code. Must be confirmed by OEM documentation.

• Governing Specification: Textron Aviation (Hawker) Engineering Drawing DHS1432.

Aircraft Compatibility

This OEM close-tolerance bolt is the specified structural hardware for the most critical joints on specific Hawker business jets.

• Primary Textron Aviation Platforms:

  • Hawker 750, 800XP, 850XP, 900XP

  • Other Hawker models as specified.

Note: Verification of applicability is the absolute responsibility of the installer. The aircraft's current Structural Repair Manual (SRM) and Illustrated Parts Catalog (IPC) are the final authorities for confirming part number eligibility for a specific structural location.

Applications

• Primary Structural Connections:

  • Wing-to-fuselage attach fittings.

  • Horizontal and vertical stabilizer attachments.

  • Main landing gear trunnions and major support structures.

  • Engine pylon and mount attachments.

Why Choose DHS1432-15GG?

This is one of the most critical pieces of hardware on the entire airframe. There is no substitute. Its material strength and, most importantly, its precise close-tolerance diameter are fundamental to the certified design strength and fatigue life of the aircraft's primary structure. Using a standard AN or MS bolt in a close-tolerance hole would create a loose "clearance fit," which would concentrate loads, cause joint slippage, and lead to rapid fatigue cracking and catastrophic structural failure. Only the genuine OEM part is airworthy for this application.

The DHS1432-15GG bolt leverages the engineering principle of an interference fit to enhance the fatigue life of a shear joint. When the bolt, which is fractionally larger than the hole, is installed (often requiring thermal shrinking of the bolt or force from a hydraulic puller), it creates a state of high radial compressive stress in the surrounding material of the structural fitting. This beneficial compressive pre-stress must be overcome by applied tensile loads before the material at the edge of the hole can experience any net tension. Since fatigue cracks only initiate and propagate in tension, this compressive field dramatically increases the number of load cycles the joint can endure before a crack can form. This, combined with the complete elimination of microscopic movement (fretting corrosion) between the bolt and the hole wall, results in a joint with a fatigue life that can be orders of magnitude greater than an equivalent joint using a standard clearance-fit bolt.

Note: This is a primary structural, flight-critical fastener. Installation and removal are major structural repairs that must be performed by a certified structures technician in strict accordance with the aircraft's Structural Repair Manual (SRM). These procedures may require specialized tooling, reaming of the hole to a precise final dimension, and non-destructive inspection (NDI) of the hole before installation. This bolt must be paired with a specific, corresponding high-strength nut and washer.

Documentation

All technical data, including material properties, precise dimensions, and installation procedures for the DHS1432-15GG bolt, are proprietary to Textron Aviation. This information is contained within the official Structural Repair Manual (SRM) and Illustrated Parts Catalog (IPC) for the applicable Hawker model.