PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet
MRO / Pipe, Tubing, Hose, and Fittings / 4730-00-289-5268

12521Packing Nut

Bomag Usa Sub of United Dominion Industries Ltd · NSN 4730-00-289-5268 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-00-289-5268 — this item is cataloged by the U.S. Government under National Stock Number 4730-00-289-5268. Primary manufacturer part number: 12521.
L 0.500 INCHES NOMINAL IN RIGHT-HAND HOSE FITTING
4730-00-289-5268 — No Item Name Available illustration
Features
  • Packing Nut — FSC 4730
  • Thread Size: 1.750-14
  • Thread Length: 0.500 INCHES NOMINAL IN
  • Smallest Inside Diameter: 0.906 INCHES NOMINAL IN
  • Width Across Flats: 2.125 INCHES NOMINAL IN
  • Screw Thread Location: INTERNAL
  • Length to Shoulder: 0.625 INCHES NOMINAL IN
  • Style Designator: HEXAGON, INTERNAL THREAD, SHOULDERED
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Iron Cast construction
General Description

The Packing Nut, cataloged under National Stock Number 4730-00-289-5268, 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 Bomag Usa Sub of United Dominion Industries Ltd. Government technical data includes 12 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. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4730-00-289-5268
Primary Part Number12521
Item NamePacking Nut
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerBomag Usa Sub of United Dominion Industries Ltd
StatusACTIVE
Thread Size1.750-14
Thread Length0.500 INCHES NOMINAL IN
Smallest Inside Diameter0.906 INCHES NOMINAL IN
Width Across Flats2.125 INCHES NOMINAL IN
Screw Thread LocationINTERNAL
Length to Shoulder0.625 INCHES NOMINAL IN
Style DesignatorHEXAGON, INTERNAL THREAD, SHOULDERED
MaterialIRON CAST
Casehardening IndicatorNOT CASEHARDENED
Thread Class2B
Screw Thread Series DesignatorUNS
Thread DirectionRIGHT-HAND
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
⇄ Verified Substitutes 10
5133-00-227-5966 INTERCHANGEABLE
Drill,twist
5315-00-282-687912521 INTERCHANGEABLE
Pin,straight,headless
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
5935-00-430-6877ST5M1348TS1C INTERCHANGEABLE
Connector,plug,electrical
The Boeing Company Div Defense
5930-00-655-1513 INTERCHANGEABLE
Switch,toggle
5340-00-721-7226930-3 INTERCHANGEABLE
Handle,bow
Goe Engineering Co Inc
5930-00-883-01282615080-016 INTERCHANGEABLE
Switch,push
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5950-00-954-4496900123-35 INTERCHANGEABLE
Transformer,power
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
4820-01-303-1107 INTERCHANGEABLE
Valve,gate
5340-01-537-997412521 INTERCHANGEABLE
Cap,filler Opening
Generac Mobile Products, Llc
3020-01-628-502812521 INTERCHANGEABLE
Rod,pinion
Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc
Cross-Reference Index
Part NumberManufacturer
12521 Bomag Usa Sub of United Dominion Industries Ltd (USA)
Related Parts
5133-00-227-5966INTERCHANGEABLE
DRILL,TWIST
5315-00-282-6879INTERCHANGEABLE
PIN,STRAIGHT,HEADLESS
12521
5935-00-430-6877INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
ST5M1348TS1C
5930-00-655-1513INTERCHANGEABLE
SWITCH,TOGGLE
5340-00-721-7226INTERCHANGEABLE
HANDLE,BOW
930-3
5930-00-883-0128INTERCHANGEABLE
SWITCH,PUSH
2615080-016
5950-00-954-4496INTERCHANGEABLE
TRANSFORMER,POWER
900123-35
4820-01-303-1107INTERCHANGEABLE
VALVE,GATE
5340-01-537-9974INTERCHANGEABLE
CAP,FILLER OPENING
12521
3020-01-628-5028INTERCHANGEABLE
ROD,PINION
12521

Frequently Asked Questions

What is NSN 4730-00-289-5268?

NSN 4730-00-289-5268 is a Packing Nut, manufactured by Bomag Usa Sub of United Dominion Industries Ltd, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-00-289-5268?

NSN 4730-00-289-5268 has 1 cross-referenced part number: 12521 (Bomag Usa Sub of United Dominion Industries Ltd).

What NSN replaces 4730-00-289-5268?

There are 10 known substitutes for 4730-00-289-5268: 5133-00-227-5966, 5315-00-282-6879, 5935-00-430-6877 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 12521?

Key specifications for 12521: Thread Size: 1.750-14; Thread Length: 0.500 INCHES NOMINAL IN; Smallest Inside Diameter: 0.906 INCHES NOMINAL IN; Width Across Flats: 2.125 INCHES NOMINAL IN. 14 total characteristics are documented in the Federal Logistics Information System.

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