AN5H5A - Textron Aviation OEM Aerospace Bolt 23/32

AN5H5A – Textron Aviation OEM Aerospace Bolt 23/32

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Overview

The AN5H5A is a military-standard, structural airframe bolt, a flight-critical fastener engineered for high-stress applications where a positive locking method is required. Manufactured in strict accordance with Air Force/Navy (AN) standards, this bolt's defining feature is its drilled hexagonal head, which is specifically designed for securing with safety wire. Fabricated from high-tensile strength alloy steel and plated for corrosion resistance, the AN5H5A is used in areas of high vibration where the integrity of the bolted joint must be physically secured and visually verifiable.

Key Features

• Drilled Head for Safety Wiring: The primary feature is a small hole drilled through the flats of the hexagonal head. This allows for the installation of safety wire, a positive locking method that physically prevents the bolt from loosening due to vibration.
• High-Tensile Strength: Fabricated from premium alloy steel (typically 4037 or 8740) and heat-treated to achieve a minimum tensile strength of 125,000 PSI, providing the robust performance required for primary structural joints.
• Precision Manufacturing: The bolt shank is centerless ground and the threads are rolled after heat treatment. This process creates a stronger, more fatigue-resistant fastener compared to bolts with machined or cut threads.
• Corrosion-Resistant Plating: Plated with a durable cadmium finish per specification AMS-QQ-P-416, Type II, Class 2 or 3. This plating provides excellent protection against environmental corrosion, ensuring the long-term structural integrity of the fastener.
• AN Standard Certified: As a certified AN-standard part specified by Textron Aviation, it guarantees full material traceability, dimensional accuracy, and quality control, ensuring it meets the stringent requirements for use in certified aircraft.

Technical Specifications: AN5H5A - Textron Aviation OEM Aerospace Bolt

• Standard: AN5H (Airframe Bolt, Drilled Hex Head)
• Full Part Number: AN5H5A
• Material: High-Tensile Alloy Steel (4037 / 8740)
• Finish: Cadmium Plated, Type II
• Head Style: Drilled Hexagonal (Hex Head)
• Thread Specification: 5/16-24 UNF-3A
  • Nominal Diameter: 5/16 inch (0.312 inches)
  • Threads Per Inch: 24 (Fine Thread)
• Overall Length: 23/32 inches (0.719 inches), measured from under the head.
• Grip Length (Unthreaded Shank): 3/16 inch (0.188 inches)
• Drilled Shank: No (Indicated by "A" suffix)

(Note: Specifications are based on general AN bolt standards for AN5H5A. Always refer to your aircraft's specific maintenance manual and Textron Aviation's Illustrated Parts Catalog for definitive application details.)

Aircraft Compatibility

The AN5H5A is a universal structural fastener used across nearly every category of certified and experimental aircraft, including all models from Textron Aviation (Cessna, Beechcraft), Piper, and others. Its use is specified wherever a structural bolt requires safety wiring as the primary or secondary locking method.

• Common Applications:
  • Engine Accessories: Securing starters, alternators, magnetos, and fuel pumps where vibration is intense.
  • Firewall Forward: Used extensively on engine baffles, brackets, and other components in the engine compartment.
  • Flight Control Systems: Fastening linkages, bellcranks, and brackets where positive locking is essential for safety of flight.
  • Structural Assemblies: Used in any structural joint where engineering specifications call for safety wiring over a self-locking nut alone.

Applications

The AN5H5A is the specified solution for creating a mechanically secured bolted joint:

• Positive Locking: The drilled head allows for safety wire to be routed from the bolt head to an anchor point or to another bolt, making it physically impossible for the bolt to rotate loose.
• Shear & Tension Joints: Designed to effectively carry both shear (side-to-side) and tension (pulling) loads.

Why Choose AN5H5A?

In many critical areas of an aircraft, a self-locking nut alone is not considered sufficient protection against loosening from vibration. Safety wiring provides a redundant, physically robust, and visually inspectable locking method. Using a genuine AN5H5A drilled-head bolt is the only way to properly implement this technique. Substituting with an undrilled bolt or using non-certified hardware is a serious violation of airworthy maintenance practices. For any joint that requires safety wire, trust only certified AN-standard hardware.

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SEO-Enhanced Addendum

The part numbering system for AN bolts with drilled heads provides a complete description. In AN5H5A:

• AN: Signifies "Air Force/Navy," the original standardizing body.
• 5: Indicates the nominal shank diameter in sixteenths of an inch (5/16").
• H: Denotes a Drilled Head, the key feature of this bolt series, allowing for the use of safety wire.
• 5: Indicates the nominal length in eighths of an inch (5/8"), though the actual overall length is a more precise 23/32".
• A: Denotes an undrilled shank, for use with a self-locking nut or a plain nut and lock washer, where the primary locking feature is the safety wire on the head.

This system allows mechanics to quickly identify a bolt's size, length, and features, ensuring the correct, airworthy hardware is used for every installation.

Note: This is a flight-critical structural component. Always verify the correct bolt part number (diameter and length) from the applicable aircraft maintenance manual or Illustrated Parts Catalog (IPC). The grip length must be appropriate for the material thickness being fastened. Installation requires the use of a calibrated torque wrench and a corresponding certified nut. Safety wiring must be performed in accordance with FAA standards (e.g., AC 43.13-1B).