Military Standard MS21921-6D Aluminum Nut, Tube | PartsPerk
NATO stock number
NSN 4730-00-554-7397 Military Standard MS21921-6D Aluminum Nut, Tube Coupling Sourcing Path
NSN 4730-00-554-7397 belongs to FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. PartsPerk uses this identifier to help buyers prepare RFQ, TraceFit, AOG, Supplier Backup, and Alternate Path workflows. Availability, fit, documentation, and authorization must be confirmed before purchase or use.
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.
Catalog state: source visible. Some workflows may require additional source enrichment or supplier confirmation.
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 4730-00-554-7397?
NSN 4730-00-554-7397 is commonly identified with Military Standard MS21921-6D Aluminum Nut, Tube Coupling in Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings). PartsPerk uses this NATO stock number to route RFQ preparation, TraceFit checks, supplier backup, alternate-path review, and AOG workflows — without asserting stock, price, interchangeability, airworthiness, or counterparty authorization.
What buyers can do on the NSN 4730-00-554-7397 Military Standard MS21921-6D Aluminum Nut, Tube Coupling 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 4730-00-554-7397 Military Standard MS21921-6D Aluminum Nut, Tube Coupling Sourcing Path
NSN· 4730-00-554-7397· 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 4730-00-554-7397 mean here?
It is a sourcing reference — not a stock or availability claim. PartsPerk connects the NSN to related context (FSC, product family, RFQ, document check, AOG, backup suppliers), then a real aviation sourcing specialist reviews the request. Compatibility, PMA/ADs, trace, and seller authorization stay with you until documented per deal.
Does PartsPerk certify airworthiness?
No. We organize sourcing workflows and catalog references. Engineering, PMA/AD applicability, paperwork, airworthiness approvals, trace, and suitability must be validated by authorized parties.
Is stock held or shipment guaranteed?
We do not show live stock, price, availability, airworthiness, fit, or interchangeability before a human reviews your quote request.
PUB LOG referenceEvidence-safe related rows — not stock, price, or GTIN claims. Bounded sample; always confirm particulars with procurement engineering and records teams.
Military Standard MS21921-6D Aluminum Nut, Tube Coupling — Approvals and Conformities NSN 4730-00-554-7397 MIL-SPEC# MIL-F-18280 Product Attributes Country of Origin United States Size 3/8" Shipping Weight 0.001 pounds ECCN EAR99 Color Family Green Manufacturer P/N MS21921-6D Schedule B Code 7609.00.0000 Pac
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
Send an RFQ — paperwork lined up before the supplier replies.
Add quantity and contact details — we'll confirm price, lead time, and a trace plan.