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The Top NAS1149 Flat Washers in Aerospace Applications
Washers, particularly flat washers, are not consumable hardware items that get much love. But they perform a critical role on your aircraft. On every aircraft. All aircraft use flat washers as a standard washer solution to prevent hardware from burrowing holes through metal and other substrates. It also allows you to adjust for the correct number of threads and grip on fasteners.
Your combat-oriented supply offices and other locations where bench stock is held demand a steady supply of the hardware that keeps your aircraft flying. And NAS1149 flat washers are critical. Greenwood Aerospace provides the washers, shims, and other small stampings you need, when you need them, at competitive prices and in the quantities required to support operational tempo. Let’s take a look.
Why NAS1149 Flat Washers Matter in Aerospace
Many legacy performance standards and specifications have fallen by the wayside over the decades, particularly for airframes in service for 60 to 70 years, such as the KC-135 Stratotanker, the C-130 Hercules, and the B-52 Stratofortress.
NAS1149 flat washers are a modern standard replacement for AN960 washers. These flat washers are designed to provide proper bolt grip length, consistent load distribution, and reliable fastening in high-vibration environments. These performance improvements are why NAS1149 flat washers remain a preferred washer type in aerospace applications, for legacy and modern aircraft alike.
It is imperative that, with hardware, you select the right material, finish, and quantity to keep up with demand and replace hardware one-for-one. This ensures quality, reliable performance, and a secure fastening process over time.
What Is a NAS1149 Flat Washer?
What exactly is an NAS1149 Flat Washer? This washer is built to precision specifications, in accordance with national aerospace standards. It is designed for aerospace and other high-performance applications where detail, shapes, and dimensional consistency matter.
Washers are a standard item on most bolts—almost all bolts, in fact. They help you distribute a clamping force, protect mating surfaces, and reduce loosening under vibration. These are commonly used alongside wave washers, standard washers, and shims to complete fastening systems.
The NAS1149 designation communicates the material, finish, and thickness. These washers are typically supplied as part of a broader set of aerospace products, rather than as generic hardware.
Common Materials Used in NAS1149 Flat Washers
What is the composition of an NAS1149 flat washer? These washers are often manufactured from 18-8 and 300-series stainless steel, such as 301, 302, and 304. These materials offer corrosion resistance and strength for a wide variety of aerospace needs.
These are a significant improvement over standard washers and are offered at competitive prices through Greenwood Aerospace’s procurement services. They are a special washer and should be used when specified.
Aluminum NAS1149 Washers
There are circumstances when you want an aluminum NAS1149 washer to maintain material compatibility and prevent galvanic corrosion. Common alloys include 2024-T3/T81 and 7075 aluminum.
These washers are lightweight and commonly anodized, making them ideal where weight reduction is critical. When buying aluminum NAS1149 washers, matching the correct alloy to the airframe structure is essential.
Carbon Steel NAS1149 Washers
Carbon steel NAS1149 washers are typically produced from 1020 or 1025 steel and cadmium-plated. These washers are used where strength is required, and corrosion exposure is controlled.
They are commonly found in interior aircraft applications and pressurized cabin environments where humidity is regulated.
Material Selection and Galvanic Compatibility
Washer material must be compatible with the fastener and mating structure. Mixing incompatible materials increases the risk of corrosion and reduces service life. This is a key example of why proper hardware selection matters.
Manufacturing and Quality Requirements
NAS1149 washers are produced by precision stamping or die-cutting with strict dimensional tolerances. Quality control includes inspection, finish verification, and contamination control using specialized equipment and trained employees.
Aerospace buyers look for suppliers with a documented commitment to quality, a reliable team, and a secure supply chain. Greenwood Aerospace brings over 40 years of experience and proven results.
Aerospace Applications for NAS1149 Flat Washers
NAS1149 flat washers are used throughout aircraft structures, including avionics mounting, wing assemblies, and engine accessories. Always verify material callouts in the illustrated parts breakdown before purchase; this can and will save you a lot of headaches later on.
Partner With Greenwood Aerospace for NAS1149 Washers & Other Hardware
Greenwood Aerospace is a trusted partner and sourcing house for aerospace hardware supplied by Superior Washer and Gasket Corp, a proud U.S.-based LLC that continues to serve aerospace customers nationwide.
We help customers find, source, and purchase the right washers, shims, and small stampings through our GSA contract, with fast delivery, dependable stock, and responsive service.
Contact our team today to learn how we can support your hardware needs.
As a U.S. Department of State ITAR-registered company, Greenwood Aerospace is fully certified to support defense and government contracting requirements. We maintain an AS9120B Quality Management System and ITAR DDTC Export Compliance.
GSA Multiple Award Schedule (MAS) Contract: 47QSMS25D00B8
Company Identifiers:
UEI: KVSUYYSJS174
DUNS: 604006874
Cage Code: 2Y735
NAICS: 488190, 336413, 332722, 336411, 481212, 532411
Need help with product availability, bulk orders, or expedited shipping? Contact gsasales@greenwood.aero or call us at580-865-6000 / 833-GSA-EBUY (833-472-3289).
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