NAS620
Flat Washers
Mumbai · India
Why a CRES-Specific Washer Standard Genuinely Helps
AN960’s broad appeal is exactly its flexibility — a single standard covering steel, corrosion-resistant steel, and aluminum options lets a design decision about material get made separately from the washer’s dimensional specification. But that same flexibility means every purchase order still has to explicitly state which material class is wanted; the part number alone doesn’t fully pin it down.
NAS620 removes that step entirely for assemblies where corrosion-resistant material is always the answer. Citing NAS620 on a drawing tells a supplier the material requirement directly, without a separate material call-out riding alongside the washer dimension — useful specifically in marine-adjacent aircraft equipment, fuel system zones, and other locations where corrosion resistance isn’t situational, it’s simply mandatory every time.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our NAS620 washer range is manufactured in corrosion-resistant steel with precision dimensional control, verified under our ISO 9001:2015 quality system.
Where NAS620 Genuinely Applies
Removes Material Ambiguity
Citing NAS620 tells a supplier the corrosion-resistant material requirement without a separate call-out.
Precise Match to AN/NAS Bolt Series
Dimensioned to fit aerospace bolt head bearing diameters correctly, consistent with AN960 sizing logic.
Genuine Corrosion Resistance by Default
No risk of a lower-corrosion-resistance material being substituted when the part number itself specifies CRES.
Verified Dimensional Precision
Batch dimensional testing confirms genuine fit to AN/NAS bolt series, not just nominal size.
NAS620 Options Explained
300 Series CRES Washer
Our standard NAS620 material, chosen specifically where corrosion resistance is a fixed requirement, not a variable.
Passivation Surface Treatment
Standard passivation to maximize corrosion resistance performance for the CRES base material.
Standard Sizing to AN/NAS Bolt Series
Outer diameter, inner diameter, and thickness matched precisely to standard AN/NAS bolt head bearing surfaces.
NAS620 vs AN960 Selection Guide
Confirming whether the assembly always needs corrosion-resistant material, or whether material flexibility is genuinely useful, determines which washer standard fits the drawing best. This table is the quick reference we use with buyers before quoting.
| Aspect | NAS620 | AN960 |
|---|---|---|
| Material Scope | Corrosion-resistant steel only | Steel, CRES, or aluminum |
| Purchase Order Clarity | Material fixed by part number | Material stated separately |
| Best Suited For | Always-CRES assemblies | Assemblies needing material choice |
| Matching Bolt Series | AN / NAS aircraft bolts | AN / NAS aircraft bolts |
NAS620 Specification Details
Material We Manufacture In
- Corrosion-Resistant Steel 300 Series, Passivated
- Finish Passivated / Bright Annealed
- Corrosion Testing Salt Spray Available
- Traceability Full Heat Lot Documentation
How NAS620 Washers Are Made
- Process Stamped & Precision Sized
- Tolerance Aerospace Controlled
- 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 corrosion-resistant material is always the requirement, never a variable.
Fuel System Assembly
in fuel-exposed zones
Marine & Naval Aviation Equipment
equipment assembly
Defense & Military Aircraft
fixed-material requirements
Hydraulic & Fluid System Assembly
near hydraulic systems
Chemical-Exposure Equipment
corrosive chemical environments
Aircraft Systems & Equipment Mounting
bracket fastening
Aerospace MRO & Repair
component replacement work
General Fixed-CRES Fastening
explicitly specified
Standard Export Documentation
Prepared as standard practice for every NAS620 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 material/size specification in full.
Dimensional Inspection Report
Verification of outer diameter, inner diameter, and thickness against NAS620 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, covering steel, CRES, and aluminum.
View AN960 →NAS6603 Hex Head Bolts
Our precision close-tolerance structural bolt range, commonly matched with NAS620 washers.
View NAS6603 →FF-W-100 Flat Washers
Our general federal specification flat washer range for non-aerospace procurement needs.
View FF-W-100 →Fasteners Manufacturer & Exporter to the USA
Our broader capability manufacturing to ASTM/ASME and US federal/military standards.
View USA Export Guide →Need Corrosion-Resistant
Fastening, No Ambiguity?
Send us your bolt size and grip length requirement — we’ll confirm the right NAS620 washer and quote alongside matching NAS6603 bolts. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in