PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

A18-6Nut,tube Coupling

Lube Devices Inc Flodar Fluid Power Fittings Div · NSN 4730-01-239-3534 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-01-239-3534 — this item is cataloged by the U.S. Government under National Stock Number 4730-01-239-3534. Primary manufacturer part number: A18-6.
Features
  • Nut,tube Coupling — FSC 4730
  • Width Across Flats: 0.688 INCHES NOMINAL IN
  • Nut Height: 0.719 INCHES NOMINAL IN
  • Smallest Inside Diameter: 0.375 INCHES NOMINAL IN
  • Thread Series: UNF
  • Thread Class: 2B
  • Nominal Tube Outside Diameter: 0.375 INCHES IN
  • Nominal Thread Size: 0.562 INCHES IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Fluid conveyance
  • Hydraulic system plumbing
General Description

The Nut,tube Coupling, cataloged under National Stock Number 4730-01-239-3534, 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 Lube Devices Inc Flodar Fluid Power Fittings Div. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4730-01-239-3534
Primary Part NumberA18-6
Item NameNut,tube Coupling
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerLube Devices Inc Flodar Fluid Power Fittings Div
StatusACTIVE
Width Across Flats0.688 INCHES NOMINAL IN
Nut Height0.719 INCHES NOMINAL IN
Smallest Inside Diameter0.375 INCHES NOMINAL IN
Thread SeriesUNF
Thread Class2B
Nominal Tube Outside Diameter0.375 INCHES IN
Nominal Thread Size0.562 INCHES IN
Fabrication MethodMACHINED
MaterialSTEEL OVERALL
Nut StyleTUBE COUPLING
Thread Tolerance Class6H INTERNAL
Thread Quantity Per Inch18
Thread DirectionRIGHT-HAND
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5940-00-113-3137MS20659-101 INTERCHANGEABLE
Terminal,lug
Sae International Dba Sae International
1615-00-134-5204206-010-442-1 INTERCHANGEABLE
Housing Part,transmission,mechan
Bell Textron Inc
4310-00-479-8856Z102 INTERCHANGEABLE
Parts Kit,compressor Unloader
Gardner Denver Inc.
3455-00-517-600358-10037 INTERCHANGEABLE
Cutter,milling,plain
Union Butterfield Corp P O Box 9000 Crystal Lake Il 60039
5940-00-549-2872A18-6 INTERCHANGEABLE
Terminal,lug
Abb Installation Products Inc
5995-00-642-3049CX2491-6FT INTERCHANGEABLE
Cable Assembly,power,electrical
Joint Electronics Type Designation System
5365-00-850-5204A18-6 INTERCHANGEABLE
Ring,back-Up
Ortman Fluid Power Quincy Compressor Div Sub of Coltec Industries Inc
5330-00-875-4107Z102G INTERCHANGEABLE
Gasket Set
Gardner Denver Inc.
6515-01-101-0226 INTERCHANGEABLE
Surgical Pack,disposable
5962-01-159-3538728000-174 INTERCHANGEABLE
Microcircuit,linear
Raytheon Company Div Rmd Strategic
Cross-Reference Index
Part NumberManufacturer
A18-6 PRIMARY Lube Devices Inc Flodar Fluid Power Fittings Div (USA)
Related Parts
5940-00-113-3137INTERCHANGEABLE
TERMINAL,LUG
MS20659-101
1615-00-134-5204INTERCHANGEABLE
HOUSING PART,TRANSMISSION,MECHAN
206-010-442-1
4310-00-479-8856INTERCHANGEABLE
PARTS KIT,COMPRESSOR UNLOADER
Z102
3455-00-517-6003INTERCHANGEABLE
CUTTER,MILLING,PLAIN
58-10037
5940-00-549-2872INTERCHANGEABLE
TERMINAL,LUG
A18-6
5995-00-642-3049INTERCHANGEABLE
CABLE ASSEMBLY,POWER,ELECTRICAL
CX2491-6FT
5365-00-850-5204INTERCHANGEABLE
RING,BACK-UP
A18-6
5330-00-875-4107INTERCHANGEABLE
GASKET SET
Z102G
6515-01-101-0226INTERCHANGEABLE
SURGICAL PACK,DISPOSABLE
5962-01-159-3538INTERCHANGEABLE
MICROCIRCUIT,LINEAR
728000-174
5315-01-211-1290INTERCHANGEABLE
KEY,WOODRUFF
A-186
6150-01-496-2676INTERCHANGEABLE
CABLE ASSEMBLY,POWER,ELECTRICAL
A-186

Frequently Asked Questions

What is NSN 4730-01-239-3534?

NSN 4730-01-239-3534 is a Nut,tube Coupling, manufactured by Lube Devices Inc Flodar Fluid Power Fittings Div, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-01-239-3534?

NSN 4730-01-239-3534 has 1 cross-referenced part number: A18-6 (Lube Devices Inc Flodar Fluid Power Fittings Div).

What NSN replaces 4730-01-239-3534?

There are 12 known substitutes for 4730-01-239-3534: 5940-00-113-3137, 1615-00-134-5204, 4310-00-479-8856 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of A18-6?

Key specifications for A18-6: Width Across Flats: 0.688 INCHES NOMINAL IN; Nut Height: 0.719 INCHES NOMINAL IN; Smallest Inside Diameter: 0.375 INCHES NOMINAL IN; Thread Series: UNF. 13 total characteristics are documented in the Federal Logistics Information System.

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