Posted on August 28, 2026 Tony Adams
In the high-stakes worlds of aviation manufacturing and Maintenance, Repair, and Overhaul (MRO), precision isn't just a requirement, it is a matter of flight safety. Every commercial aircraft and defense platform relies on specialized structural hardware engineered to withstand extreme vibration, severe mechanical fatigue, and thermal stress.
At the center of these hardware specifications are National Aerospace Standards (NAS). Managed by the Aerospace Industries Association (AIA), NAS part numbers define the high-strength fasteners, close-tolerance bolts, and vibration-dampening components required across modern airframes.
Unlike standard commercial hardware, NAS parts feature hyper-specific tolerance, material, and finish callouts. In this guide, we break down what NAS standards represent, how to decode their part numbers, and the top 10 NAS hardware series relied upon by engineers and technicians worldwide.
National Aerospace Standards provide tight-tolerance design criteria for components used in primary and secondary flight structures. While legacy general aviation often relies on Army-Navy (AN) standards or Military Standard (MS) specs, modern high-performance aircraft overwhelmingly utilize NAS hardware due to its superior tensile strength (often 160,000 to 180,000 PSI) and strict quality control.
Every character inside an NAS part callout provides essential engineering data. Understanding this nomenclature ensures you order the exact grip length, shank diameter, and material code required for your material stack-up.
Component Type: The NAS6200 series includes precision hex-head structural bolts designed for demanding aerospace fastening applications.
Primary Use: These bolts are commonly used in main airframe structural joints, engine mounts, and landing gear attachments.
Key Feature: Their controlled grip lengths help ensure the appropriate portion of the fastener engages the structural joint.
Component Type: NAS1351 and NAS1352 socket head cap screws are aerospace fastening components available in configurations suited to compact mechanical assemblies.
Primary Use: They are commonly used for avionics rack mounting, interior structures, and applications where installation clearance is limited.
Key Feature: Their socket-head design allows installation where conventional wrench access may be restricted.
Component Type: The NAS1100 to NAS1102 series covers aerospace machine screws with different head configurations for specialized installation requirements.
Primary Use: These fasteners can be used in exterior skins, access panels, fairings, and other aircraft sheet-metal assemblies.
Key Feature: Flush-head configurations can help maintain a smooth external surface where aerodynamic considerations are important.
Component Type: NAS9603 to NAS9624 structural bolts are fine-thread aerospace fasteners used in applications requiring controlled fastening and structural performance.
Primary Use: They may be found in fuselage frames, wing structures, and other load-bearing assemblies.
Key Feature: Fine-thread configurations allow precise tightening and can support controlled clamping during installation.
Component Type: The NAS6603 to NAS6620 series consists of structural bolts with extended unthreaded shanks for applications requiring specific grip lengths.
Primary Use: These fasteners are suitable for multi-layer structural joints, including certain wing and airframe assemblies.
Key Feature: The extended grip section helps provide the appropriate bearing area through the joint.
Component Type: NAS1580 and NAS1581 flush tension bolts are designed for structural applications where a flush exterior profile is required.
Primary Use: They may be used in highly loaded exterior joints and other aircraft structures where surface geometry is important.
Key Feature: Their flush-head configuration combines aerodynamic considerations with structural fastening requirements.
Component Type: The NAS43 series includes aerospace spacers and bushings used to maintain controlled spacing, alignment, and support between components.
Primary Use: These components can be used in mounting assemblies, structural joints, routing applications, and other aircraft systems.
Key Feature: Different materials and dimensions allow NAS43 components to meet varied aerospace installation requirements.
Component Type: NAS1677 cushioned clamps are retaining components designed to secure routed lines and other aircraft system components.
Primary Use: They are commonly associated with applications involving tubing, wiring, hydraulic lines, and fuel-system routing.
Key Feature: The cushioning helps reduce movement and contact between the retained component and surrounding structure.
Component Type: The NAS1669 series blind rivets provide mechanically locked fastening solutions for structural applications where access to the rear side of the joint is restricted.
Primary Use: These rivets can be used in aircraft manufacturing, maintenance, and repair applications where conventional two-sided installation is difficult.
Key Feature: Blind installation allows the fastener to be installed from one accessible side of the assembly.
Component Type: NAS1464 to NAS1468 shoulder bolts are precision fasteners designed for applications where controlled fit and alignment are important.
Primary Use: They can be used in flight-control linkages, hinges, pivots, bellcranks, and other moving mechanical assemblies.
Key Feature: Their precision shoulder and shank dimensions help support accurate alignment and controlled mechanical movement.
When sourcing mission-critical hardware for FAA Part 145 repair stations or OEM assembly lines, supply chain integrity is paramount. ASAP Components delivers reliable, fully traceable procurement solutions backed by industry-leading standards:
Whether you are carrying out routine heavy maintenance or engineering a structural repair, choosing the correct NAS part number is vital for airworthiness and long-term durability. Understanding the subtle differences between bolt series from shear tolerances to vibration-dampening clamps allows procurement teams and maintenance technicians to keep fleets flying safely and efficiently.
A: The prefix identifies the base family (e.g., NAS62), the next digits indicate shank diameter, the dash number specifies grip length in 1/16-inch increments, and trailing letters define material or drilled shank configurations.
Q: What is the main difference between NAS and MS hardware?
A: NAS parts are designed specifically for high-fatigue, close-tolerance airframe applications by the Aerospace Industries Association. MS parts were developed by the U.S. Military for broader defense hardware needs, though many are now managed as NASM standards.
A: All NAS, NA, and NASM specifications are managed and updated by the Aerospace Industries Association (AIA).
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