NAS1149
Flat Washers
Mumbai · India
Why NAS1149 Shows Up on Nearly Every Parts List
Ask anyone who orders aircraft hardware regularly which flat washer number they see the most, and NAS1149 is very likely the answer. Its part number carries the size information directly in the number itself — a prefix (commonly “F” for a plain flat washer, “FN” for a specific variant) followed by digits identifying the hole size and outer diameter, so a technician reading a parts catalog can identify the exact washer needed without cross-referencing a separate dimension table.
That self-describing numbering is exactly why NAS1149 dominates general aviation maintenance and parts supply in a way AN960 and NAS620, despite covering overlapping washer needs, don’t quite match for day-to-day ordering convenience. Whether it’s replacing a washer during scheduled maintenance or stocking spares for a fleet, NAS1149’s part number tells the story on its own.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our NAS1149 washer range is manufactured in corrosion-resistant stainless steel with precision dimensional control, verified under our ISO 9001:2015 quality system.
Where NAS1149 Genuinely Applies
Self-Describing Part Number
Size information is embedded directly in the part number, speeding up ordering and stock verification.
Widely Stocked & Recognized
Familiar to MRO shops and parts distributors, simplifying cross-checking and spares management.
Consistent Stainless Steel Material
Standard corrosion-resistant material simplifies material verification for general aviation applications.
Verified Dimensional Precision
Batch dimensional testing confirms genuine fit to the size indicated in the part number itself.
NAS1149 Numbering System Explained
F / FN Series Prefix
Identifies the specific washer series variant within the broader NAS1149 family.
Embedded Dimension Code
Digits following the prefix identify hole size and outer diameter directly, without a separate lookup table.
Standard Stainless Steel
Consistent corrosion-resistant material across the range, simplifying material verification on receipt.
NAS1149 vs AN960 vs NAS620
All three washer standards cover overlapping needs, but each earns its place in a different context. This table is the quick reference we use with buyers before quoting.
| Aspect | NAS1149 | AN960 / NAS620 |
|---|---|---|
| Best Suited For | General aviation MRO ordering | Design drawing engineering reference |
| Part Number Style | Self-describing size code | Requires dimension table lookup |
| Material | Standard stainless steel | Steel / CRES / Aluminum (AN960); CRES only (NAS620) |
| Typical Buyer | MRO shops, parts distributors | Design engineers, OEM procurement |
NAS1149 Specification Details
Material We Manufacture In
- Stainless Steel 300 Series, Passivated
- Finish Passivated / Bright Annealed
- Traceability Full Heat Lot Documentation
- Corrosion Testing Salt Spray Available
How NAS1149 Washers Are Made
- Process Stamped & Precision Sized
- Part Numbering F / FN Series
- Testing Dimensional Verified
- Quality Batch Sampled
Available Dimensions
- Nominal Bolt Size #2 – 1″ (Inch Series)
- Metric Equivalent Available to Drawing
- Matching Bolt AN / NAS Series
- Custom Sizes On Request
Application Areas
Wherever a maintenance shop or parts distributor needs a fast, self-describing washer part number.
General Aviation MRO
washer replacement
Aircraft Parts Distribution
and parts catalog listings
Homebuilt & Experimental Aircraft
for builder communities
Aircraft Structural Repair
replacement fastening
Defense & Military Aircraft MRO
hardware procurement
Naval Aviation Equipment
aviation procurement
Drone & UAV Maintenance
maintenance hardware
General Aerospace-Grade Fastening
explicitly specified
Standard Export Documentation
Prepared as standard practice for every NAS1149 washer shipment.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Certificate of Conformance
Confirms the shipment matches the purchase order size/material specification in full.
Dimensional Inspection Report
Verification of outer diameter, inner diameter, and thickness against NAS1149 tolerances.
Certificate of Origin (COO)
Confirms India as country of manufacture for destination customs purposes.
NABL Accredited Test Reports
Independent mechanical and dimensional testing available on request for critical applications.
Commercial Invoice & Packing List
Itemized value, Incoterm, and detailed carton/weight breakdown for customs clearance.
Internationally Recognised Standards Coverage
Related Fastener Grades & Materials
AN960 Flat Washers
Our broader-material aerospace flat washer standard, the design engineering reference.
View AN960 →NAS620 Flat Washers
Our corrosion-resistant-only washer standard for fixed-material assemblies.
View NAS620 →NAS6603 Hex Head Bolts
Our precision close-tolerance structural bolt range, commonly matched with NAS1149 washers.
View NAS6603 →Fasteners Manufacturer & Exporter to the USA
Our broader capability manufacturing to ASTM/ASME and US federal/military standards.
View USA Export Guide →Ordering by the Number
You Already Know?
Send us the NAS1149 part number or size you need — we’ll confirm dimensions and quote across our full range, plus matching NAS6603 bolts. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in