AN3-16A – Airfasco 10-32 x 1-3/4" Hex Head Bolt
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Overview
The AN3-16A is a high-strength, general-purpose aerospace fastener manufactured by Airfasco Industries, a premier QPL (Qualified Products List) manufacturer of certified aviation hardware. This hex head bolt is produced in strict accordance with the Air Force-Navy (AN) standard, which governs its material, dimensions, and performance. With a 3/16-inch diameter and a 1-3/4-inch nominal length, this bolt is a staple for assembling a wide range of aircraft components, particularly where a long grip is necessary.
As an "A" designated bolt, it features an undrilled shank, indicating its design for use with self-locking nuts. Protected by a durable cadmium plating for superior corrosion resistance and forged from heat-treated alloy steel, this Airfasco bolt represents the highest standard of quality and traceability demanded for flight-critical applications.
Key Features
Manufactured by Airfasco: Produced by a leading, fully certified QPL manufacturer of aerospace fasteners, ensuring the highest level of quality and process control.
High-Tensile Alloy Steel: Forged from premium alloy steel (typically 4140 or 8740) and heat-treated to a minimum tensile strength of 125,000 PSI.
Cadmium Plated for Corrosion Resistance: Coated with a sacrificial cadmium layer per QQ-P-416 for exceptional protection against environmental corrosion and to ensure consistent torque-tension relationships.
Rolled Threads: Features #10-32 UNF-3A threads that are cold-rolled, a superior manufacturing process that significantly increases fatigue resistance compared to cut threads.
Undrilled Shank ("A" Type): The solid, un-drilled shank is designed for use with a variety of self-locking nuts, providing secure fastening in a wide range of tension and shear applications.
AN Standard Compliance: Guarantees every aspect of the bolt meets the rigorous standards required for airworthy components.
Technical Specifications
Part Number: AN3-16A
Component Type: Hex Head Machine Bolt
OEM Manufacturer: Airfasco Industries
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
The AN3-16A is a universal standard hardware item used across the entire spectrum of aviation, from light piston aircraft to the largest transport category jets. It is specified in countless locations on aircraft manufactured by:
Textron Aviation (Cessna, Beechcraft, Hawker)
Boeing
Airbus
Bombardier
Embraer
Piper, Cirrus, Diamond, and all other major OEMs.
Note: Verification of applicability is the responsibility of the installer. The grip length must be correctly matched to the total thickness of the material 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 from Airfasco?
The use of certified aerospace hardware from a reputable, QPL-listed manufacturer is non-negotiable for flight safety. An Airfasco AN3-16A bolt guarantees that the fastener was produced in a facility that is continuously audited to aerospace quality standards (like AS9100) and that every step of the process is documented and traceable. This ensures the material chemistry, heat treatment, and manufacturing processes are correct, eliminating the risk of installing a substandard or counterfeit part that could lead to catastrophic joint failure.
The airworthiness of a fastener like the Airfasco AN3-16A is guaranteed by the manufacturer's adherence to the Qualified Products List (QPL) system, managed by the Defense Logistics Agency (DLA). To become and remain a QPL manufacturer, a company like Airfasco must undergo rigorous and continuous auditing of their entire quality management system, manufacturing processes, and testing capabilities. For every production lot of fasteners, complete traceability is maintained from the certified raw material (with mill test reports verifying its chemical composition) through every step of forging, heat treatment (with furnace charts), thread rolling, plating, and inspection. Destructive testing is performed on samples from each lot to verify tensile strength, shear strength, and hardness. This unbroken chain of documentation, often culminating in a Certificate of Conformance (C of C) with each shipment, is the fundamental difference between a true aerospace fastener and a commercial bolt.
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 specifications for this fastener are maintained under the National Aerospace Standards (NASM), which have superseded many of the original AN drawings. Publicly accessible summaries of these standards can often be found through standards organizations and authorized hardware suppliers.