This NSN uses a valid format but is not yet in PartsPerk's verified intelligence set. You can still open sourcing workflows below — availability, fit, documentation, and supplier authorization must be confirmed before purchase or use.
NATO stock number
NSN 5331-00-221-6128 Sourcing Path
NSN 5331-00-221-6128 is filed under FSC 5331. PartsPerk uses this identifier for sourcing workflows only — confirm availability, fit, and paperwork with your team and suppliers.
PartsPerk does not claim this NSN is in stock from any vendor. This page supports RFQ readiness, TraceFit, AOG, supplier backup, and alternate-path review — not guaranteed availability, certificates, interchange, or airworthiness.
This page organizes sourcing context only. It does not confirm stock, price, availability, supplier authorization, certification, airworthiness, interchangeability, fit, export clearance, or document validity.
This NSN is not yet in the verified catalog and may require source enrichment before public indexing.
Demand intelligence layer
Plain-language answers & next actions
Internal usefulness signal 100 out of one hundred — controls search indexing policy, not stock or certification claims.
Quick answer
What is NSN 5331-00-221-6128?
NSN 5331-00-221-6128 maps to FSC 5331. PartsPerk helps buyers assemble sourcing paperwork and workflows around this identifier; availability, documentation fit, and regulatory approvals still require verification with your engineering and procurement teams.
What buyers can do on the NSN 5331-00-221-6128 Sourcing Path page
Submit an RFQ tied to this NSN with quantity, condition, and need-by date.
Mark the request as AOG / urgent so it bypasses the routine queue.
Request traceability documents (FAA Form 8130-3, ATA-106, Certificate of Conformance, mill cert) when required by the maintenance program.
Walk to related identifier doorways (NSN, FSC, CAGE, manufacturer, part number).
PartsPerk does not claim live inventory unless availability has been confirmed. Identifier metadata comes from public PUB LOG / DLA / SAM sources and is provided for sourcing context only.
Buyer knowledge graph
Related references for NSN 5331-00-221-6128 Sourcing Path
NSN· 5331-00-221-6128· Match
Identifier doorways for buyers researching the same Federal Supply Class, manufacturer entity, or part-number family. Each link routes to a paperwork-first capture page — no inventory or authorization claims.
What these references mean
FSCFederal Supply Class
4-digit NATO supply class — the parent group an NSN belongs to. Useful for browsing related parts that share the same supply category.
NIINNATO Item Identification Number
9-digit unique tail of an NSN. Identifies a single catalog item across nations; pair with the FSC to recover the full NSN.
Why buyers stay
What every PartsPerk RFQ comes with.
Replied to by a named sales executive
Sal Faruqui owns inbound RFQs end-to-end — no generic queue, one contact through fulfillment.
Priority review for AOG lines
Routine RFQs are reviewed promptly; AOG-marked lines bypass the routine queue and are prioritized for callback.
Documents lined up before purchase
FAA Form 8130-3, ATA-106, Certificate of Conformance, and mill-cert requirements are captured before quoting.
FAQ
What does NSN 5331-00-221-6128 mean here?
It is a sourcing reference — not a stock or availability claim. PartsPerk uses AI to connect NSNs to capability paths (FSC, product family, workflows such as RFQ, TraceFit, AOG, supplier backup), then a real aviation sourcing specialist reviews the request. Compatibility, PMA/ADs, trace sufficiency, and seller authorization remain buyer and procurement responsibilities until documented per transaction.
Does PartsPerk certify airworthiness?
No. We organize sourcing workflows and neutral catalog references — engineering, PMA/AD applicability, paperwork, airworthiness approvals, trace, and suitability must be validated by authorized parties.
Military Standard MS9386-012 O-Ring - 10/Pack — Approvals and Conformities NSN 5331-00-221-6128 Product Attributes Country of Origin United States Shipping Weight 0.01 pounds ECCN 9A991.d Color Family Black Manufacturer P/N MS9386-012 Schedule B Code 4016.93.0000 Pack Quantity 10 Series MS9386 Col
Supplier identity disclosed before award
You see who would ship the part before you commit. No anonymous resale, no last-minute supplier swap.
Recommended next step
Open the Part Command Console.
Paste any aviation identifier — NSN, NIIN, FSC, CAGE, or part number. The console classifies the type and routes to the right capability.