AN3-6A – Aerospace Undrilled Machine Bolt
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Overview
The AN3-6A Undrilled Machine Bolt is a standard aerospace-grade fastener designed for use in a wide variety of structural and non-structural aircraft assemblies. Manufactured to AN (Army-Navy) specification, this bolt is undrilled at the shank, making it ideal for applications where no safety wire or cotter pin is required, such as in shear joints or where secured by self-locking hardware.
Crafted from cadmium-plated alloy steel, the AN3-6A offers exceptional tensile strength, corrosion resistance, and dimensional uniformity, ensuring dependable fastening in airframe structures, engine mounts, landing gear brackets, and system installations. This part is commonly stocked by MROs, FBOs, and aviation maintenance shops for both certified and experimental aircraft.
Key Features
- AN-Spec Certified: Conforms to MIL-DTL-1222 and AN3 standards for aircraft bolts.
- Undrilled Shank: Ideal for use with locking nuts where safety wiring is not required.
- High Strength Alloy Steel: Engineered for high-stress aircraft applications.
- Corrosion-Resistant Finish: Cadmium plating for enhanced durability in aviation environments.
- Versatile Application: Used across general aviation, commercial aircraft, and experimental builds.
- Precision Threads and Shank: Uniform manufacturing ensures repeatable torque loading and reliable joint integrity.
Technical Specifications
- Part Number: AN3-6A
- Type: Aerospace Machine Bolt (Undrilled)
- Material: Alloy steel
- Finish: Cadmium plated (Type II, Class 2 per MIL spec)
- Thread Size: 10-32 UNF
- Grip Length: 0.375 inches
- Overall Length: 0.938 inches
- Head Style: Hex head
- Shank: Undrilled
- Certification: Meets MIL-DTL-1222 and FAA standards when used in certificated aircraft
Aircraft Compatibility
Commonly used in:
- General aviation aircraft (Cessna, Piper, Mooney, Beechcraft)
- Experimental and kit-built aircraft
- Certified and military applications following AN3 hardware usage
Refer to the aircraft’s IPC, AMM, or construction guide to confirm correct length and threading for your installation.
Applications
- Control surface attachment
- Engine mount assemblies
- Instrument panel mounting
- Landing gear brackets and support structures
- Cabin hardware and system installations
Why Choose the AN3-6A Bolt?
- Aircraft-Grade Assurance: Meets aerospace manufacturing and quality control standards.
- No Cotter Pin Needed: Perfect for lock-nut-based applications where drilling is unnecessary.
- Cadmium Protection: Withstands harsh flight line conditions and prevents thread corrosion.
- Reliable in Shear and Tension Loads: Proven performance under dynamic flight conditions.
Order Your AN3-6A Machine Bolt Today
Secure your airframe with certified aerospace hardware.
Order the AN3-6A Undrilled Machine Bolt today from Airparts.aero — your trusted source for precision aircraft fasteners, fast shipping, and reliable support.
The AN3-6A Undrilled Bolt is a staple of aviation-grade fastener systems, supporting both primary and secondary structure applications across a wide range of airframes. With its precise manufacturing, cadmium finish, and AN-spec reliability, this bolt delivers the safety, durability, and strength required in flight-critical systems. Airparts.aero provides certified AN hardware and aerospace fasteners with full traceability, making us a trusted supplier for aircraft owners, mechanics, and builders worldwide.
Install per torque and hardware guidelines in aircraft AMM. Use approved locking nuts or thread locking devices when applicable.
Description: Machine Bolt
Part Number: AN3-6A
Alternate Part Numbers: BACB30NF3-6, MILB6812, 145-540-90106, AN3-119, 932.19.21.028, 2010116, 400 440, 4107100-001, 6026-3002-8, 6026-4260-1, 6026-7001-5, 6026-7235-3, 6026-102-1, 6026-8309-2, 6026-8332-1, 6026-8382-2, 6026-8397-1, 6026-9001-31, 908124, 5306006560358, 130909B16, 130909B17
Product Overview:
An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. the threaded and unthreaded portions are both of one diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. a locking feature may be incorporated in the design of the head or threads. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. for items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. See also screw, cap, hexagon head and screw, machine.
Item Specification:
| Thread Class | 3A | |
| Thread Direction | Right-hand | |
| Thread Length | 0.406 inches minimum | |
| Fastener Length | 0.781 inches nominal | |
| Head Style | Hexagon | |
| Head Height | 0.109 inches minimum and 0.141 inches maximum | |
| Width Between Flats | 0.365 inches minimum and 0.377 inches maximum | |
| End Item Identification | KB-1 support equipment; AIRCRAFT;B-1B trainer;harpoon MISSILE;TF-56 EN;2320-01-097-0248, 2320-01-097-0249, 2320-01-100-7672, 2320-01-097-0260, 2320-01-195-7641, hemtt family (heavy expanded mobility tactical trucks) | |
| Nominal Thread Diameter | 0.190 inches | |
| Grip Length | 0.375 inches nominal | |
| Features Provided | Finished head | |
| Thread Quantity per Inch | 32 | |
| Minimum Tensile Strength | 125000 pounds per square inch | |
| Hardness Rating | 26.0 rockwell C minimum overall and 32.0 rockwell C maximum overall | |
| Material | Steel comp 4037 overall or steel comp 4130 overall or steel comp 8630 overall or steel comp 8735 overall or steel comp 8740 overall or steel comp 4140 overall | |
| Material Document and Classification | MIL-B-6812 mil spec all material responses overall | |
| Surface Treatment | Cadmium overall and chromate overall | |
| Surface Treatment Document and Classification | QQ-P-416 ty 2 cl 3 fed spec all treatment responses overall | |
| Thread Series Designator | UNF |
Fits In:
- · Bombardier Challenger 601
- · Bombardier Challenger 604
- · Bombardier Challenger 605
- · Bombardier Learjet 55
- · Bombardier Learjet 60 - all variants
- · Embraer Legacy 600-650
- · Embraer Phenom 300
- · Textron Aviation Beechcraft King Air 100 - all variants
- · Textron Aviation Beechcraft King Air 200 - all variants
- · Textron Aviation Beechcraft King Air 300 - all variants
- · Textron Aviation Beechcraft King Air 90 - all variants
- · Textron Aviation Beechcraft Premier
- · Textron Aviation Cessna 500 Citation I-ISP
- · Textron Aviation Cessna 510 Citation Mustang
- · Textron Aviation Cessna 525 Citation Citationjet
- · Textron Aviation Cessna 550 Citation I-II-Bravo
- · Textron Aviation Cessna 560 Citation V-Ultra-Encore-Excel-XLS
- · Textron Aviation Cessna 650 Citation III-IV-VI-VII
- · Textron Aviation Cessna 680 Citation Sovereign
- · Textron Aviation Cessna 750 Citation X
- · Textron Aviation Hawker 400-400XP
- · Textron Aviation Hawker 800
- · Textron Aviation Hawker 800XP-850XP
- · Textron Aviation Hawker 900XP
| Additional info | |
|---|---|
| Colors | Gold |
| Dimensions | |
|---|---|
| Dimensions (W x H x D) | 0.92" x 0.42" x 0.42" inches |
| Length | 0.92" inches |
| Weight | 0.01 lb |
| Specifications | |
|---|---|
| 8130-3 Eligible | No |
| ATA Chapter | 51 ATA Standard Practices and Structures |
| Available Conditions | NE / NS |
| Cage Code | 88044 |
| Country of origin | United States of America |
| ECCN / USML | EAR99 |
| FAA Approval Code | STD |
| Grip | 0.406 inches |
| Hazmat Code | Not Applicable |
| Hazmat(Y/N) | N |
| Material | Steel overall |
| NSN | 5306-00-656-0358 |
| Schedule B | 7318.15.2000 |
| Thread | 3A |
| Total Shelf Life (days) | Not Applicable |
| Type | Bolt |
| Units of Measure (UoM) | Each |
| Brand | Aeronautical Standard Group Inc |
| Color | Gold |
| Condition status | Depreciated |
