AN3-16A - Textron Aviation OEM Hex Head Machine Bolt

AN3-16A – Textron Aviation OEM 10-32 x 1-3/4" Hex Head Bolt

Available now on the Airparts.aero Marketplace.

Overview

The AN3-16A is a high-strength hex head bolt that holds dual authority as a component built to the exacting Air Force-Navy (AN) standard and as a genuine Textron Aviation Original Equipment Manufacturer (OEM) part. This fastener is engineered for the most critical joints, particularly those requiring a long grip length for fastening through thick material stack-ups. Its "A" designation signifies an undrilled shank, making it the standard for use with self-locking nuts in a vast array of tension and shear applications.

As a component supplied through the Textron Aviation channel, this AN3-16A bolt comes with the full assurance of OEM traceability and quality control. It is guaranteed to be the factory-specified hardware for maintaining the type-certified design and integrity of Cessna, Beechcraft, and Hawker aircraft. Fabricated from heat-treated alloy steel and finished with a protective cadmium plating, this bolt represents the highest standard of quality for a flight-critical fastener.

Key Features

• Textron Aviation OEM Certified: Supplied with the full traceability and quality assurance of Textron Aviation, guaranteeing it is the correct, factory-approved part for their fleet.

• High-Tensile Alloy Steel: Forged from premium alloy steel and heat-treated to a minimum tensile strength of 125,000 PSI for maximum joint strength.

• Cadmium Plating: Coated with a sacrificial cadmium layer per QQ-P-416 for exceptional corrosion resistance and a consistent, low-friction bearing surface.

• Rolled Threads: Features #10-32 UNF-3A threads that are cold-rolled, a superior manufacturing process that significantly increases fatigue resistance.

• Long Grip Design: A 1-3/8-inch grip length makes this bolt ideal for securing thick material stack-ups, ensuring shear loads are borne by the full-diameter shank.

• AN Standard Compliance: Fully conforms to the AN3 specification, ensuring the highest level of quality control for materials and dimensions.

Technical Specifications

• Part Number: AN3-16A

• Component Type: Hex Head Machine Bolt

• OEM Authority: Textron Aviation

• Governing Specification: AN3 / NASM3

• Material: Alloy Steel (e.g., 4140, 8740), heat-treated

• Minimum Tensile Strength: 125,000 PSI

• Finish: Cadmium Plate per QQ-P-416, Type II, Class 2

• Diameter: 3/16 inch (0.1875 inches)

• Nominal Length (under head to end): 1-3/4 inches (1.750 inches)

• Grip Length (Unthreaded Shank): 1-3/8 inches (1.375 inches)

• Thread Specification: #10-32 UNF-3A

Aircraft Compatibility

As a Textron Aviation OEM part, this fastener is specified in numerous locations across their entire product line. As an AN-standard bolt, its use is ubiquitous throughout the aerospace industry.

• Primary Textron Aviation Platforms:

  • Cessna Citation Series Business Jets

  • Beechcraft King Air, Baron, and Bonanza

  • Cessna Caravan and Piston Aircraft

  • Hawker Business Jets

• General Aerospace Usage: A fundamental component in the assembly of nearly all certified aircraft.

Note: Verification of applicability is the responsibility of the installer. The grip length must be appropriate for the material thickness being joined. Always consult the current version of the aircraft's Illustrated Parts Catalog (IPC) or maintenance manual to confirm part number eligibility.

Applications

• Assembly of primary and secondary airframe structures with thick cross-sections.

• Engine mount attachments on some light aircraft.

• Landing gear component attachment and assembly.

• Installation of fairings and inspection panels requiring long fasteners.

• Securing of interior components, systems hardware, and brackets.

Why Choose this AN3-16A?

This component provides the dual assurance of meeting the public AN aerospace standard and the specific endorsement of Textron Aviation. This guarantees the bolt's mechanical properties, from the chemistry of its steel to the fatigue-resistance of its rolled threads. Using commercial-grade hardware in an aircraft application introduces an unacceptable risk of material fracture and joint failure. By choosing this OEM-certified AN bolt, you ensure the use of a traceable, airworthy component that maintains the aircraft's original design integrity.

The cadmium plating on an AN3-16A bolt, specified under QQ-P-416, serves two critical engineering functions beyond simple corrosion protection. First, it acts as a sacrificial anode to prevent galvanic corrosion. Since this steel bolt is most often installed through aluminum alloy structures, the cadmium, being less noble than aluminum, will corrode preferentially, protecting the more critical airframe structure from degradation. Second, it serves a vital tribological purpose by providing a consistent coefficient of friction. The primary goal of torquing a fastener is to achieve a specific axial tension (preload). This torque-tension relationship is highly dependent on friction. The soft, lubricious surface of cadmium provides a predictable friction value, which is the basis for the standardized torque charts used in all aircraft maintenance manuals. This consistency ensures that a specified torque value reliably translates into the correct, engineered clamp force for the joint.

Note: This is a flight-critical hardware component. Installation must be performed by a certified mechanic. A calibrated torque wrench must be used to apply the correct torque value specified in the maintenance manual to achieve proper clamp load (preload). This bolt must be paired with a corresponding certified aerospace-grade self-locking nut (e.g., MS21044N3 or MS21045N3) to ensure the joint remains secure.

Documentation

The base standard for this part is maintained under the National Aerospace Standards (NASM). OEM-specific application and installation data is contained within the Textron Aviation maintenance and parts manuals.