PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

NAS591-8Inverted Nut,tube Coupling

National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use · NSN 4730-00-684-7303 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-00-684-7303 — this item is cataloged by the U.S. Government under National Stock Number 4730-00-684-7303. Primary manufacturer part number: NAS591-8.
Features
  • Inverted Nut,tube Coupling — FSC 4730
  • 3 verified cross-references
  • Primary manufacturer: National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Fluid conveyance
  • Hydraulic system plumbing
General Description

The Inverted Nut,tube Coupling, cataloged under National Stock Number 4730-00-684-7303, is classified within Federal Supply Class 4730 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use. This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameInverted Nut,tube Coupling
FSC / FSG4730 — No Item Name Available (FSG 47)
ManufacturersRubbercraft Corporation of California, Ltd. Dba Rubbercraft Corp (CAGE 77969); National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (CAGE 80205); Aerofit, Llc (CAGE 30974)
Technical Specifications
ParameterValue
NSN4730-00-684-7303
Primary Part NumberNAS591-8
Item NameInverted Nut,tube Coupling
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerNational Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
2925-00-953-235310-319256-1 INTERCHANGEABLE
Coil and Lead Spark
Unison Industries Llc
5950-00-992-96862097839 INTERCHANGEABLE
Transformer,power
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5998-01-218-865141778 INTERCHANGEABLE
Circuit Card Assembly
Vindicator Corp
Cross-Reference Index
Part NumberManufacturer
4177-8 Rubbercraft Corporation of California, Ltd. Dba Rubbercraft Corp (USA)
NAS591-8 PRIMARY National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
NAS591-8 Aerofit, Llc (USA)
Related Parts
2925-00-953-2353INTERCHANGEABLE
COIL AND LEAD SPARK
10-319256-1
5950-00-992-9686INTERCHANGEABLE
TRANSFORMER,POWER
2097839
5998-01-218-8651INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
41778

Frequently Asked Questions

What is NSN 4730-00-684-7303?

NSN 4730-00-684-7303 is a Inverted Nut,tube Coupling, manufactured by National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-00-684-7303?

NSN 4730-00-684-7303 has 3 cross-referenced part numbers: 4177-8 (Rubbercraft Corporation of California, Ltd. Dba Rubbercraft Corp), NAS591-8 (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use), NAS591-8 (Aerofit, Llc).

What NSN replaces 4730-00-684-7303?

There are 3 known substitutes for 4730-00-684-7303: 2925-00-953-2353, 5950-00-992-9686, 5998-01-218-8651. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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