PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21143Ring,wearing

Belfort Instrument Company · NSN 4320-01-369-9125 · FSC 4320 · No Item Name Available
Verified by PartsTable
NSN 4320-01-369-9125 — this item is cataloged by the U.S. Government under National Stock Number 4320-01-369-9125. Primary manufacturer part number: 21143.
Features
  • Ring,wearing — FSC 4320
  • 2 verified cross-references
  • Primary manufacturer: Belfort Instrument Company
Applications
  • Hydraulic and pneumatic systems
  • Industrial process pumping
  • Military vehicle hydraulics
General Description

The Ring,wearing, cataloged under National Stock Number 4320-01-369-9125, is classified within Federal Supply Class 4320 (No Item Name Available) of the Pumps and Compressors group. The primary manufacturer of record is Belfort Instrument Company. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameRing,wearing
FSC / FSG4320 — No Item Name Available (FSG 43)
ManufacturersBelfort Instrument Company (CAGE 82205); Transtechnology Corp (CAGE 56298)
Technical Specifications
ParameterValue
NSN4320-01-369-9125
Primary Part Number21143
Item NameRing,wearing
FSC / FSG4320 / 43 — No Item Name Available
ManufacturerBelfort Instrument Company
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
2990-00-258-648621143 INTERCHANGEABLE
Muffler,exhaust
Walker Mfg Co
4310-00-532-3832 INTERCHANGEABLE
Cylinder,reciprocating Compresso
3110-00-554-5407 INTERCHANGEABLE
Bearing,ball,annular
5340-01-189-5577211-43 INTERCHANGEABLE
Handle
Heathkit Co Inc Dba Heathkit Educational Systems
5945-01-468-7349 INTERCHANGEABLE
Control,interlock
Cross-Reference Index
Part NumberManufacturer
21143 PRIMARY Belfort Instrument Company (USA)
21143 Transtechnology Corp (USA)
Related Parts
2990-00-258-6486INTERCHANGEABLE
MUFFLER,EXHAUST
21143
4310-00-532-3832INTERCHANGEABLE
CYLINDER,RECIPROCATING COMPRESSO
3110-00-554-5407INTERCHANGEABLE
BEARING,BALL,ANNULAR
5340-01-189-5577INTERCHANGEABLE
HANDLE
211-43
5945-01-468-7349INTERCHANGEABLE
CONTROL,INTERLOCK

Frequently Asked Questions

What is NSN 4320-01-369-9125?

NSN 4320-01-369-9125 is a Ring,wearing, manufactured by Belfort Instrument Company, classified under FSC 4320 (No Item Name Available). Status: active.

What are the part numbers for NSN 4320-01-369-9125?

NSN 4320-01-369-9125 has 2 cross-referenced part numbers: 21143 (Belfort Instrument Company), 21143 (Transtechnology Corp).

What NSN replaces 4320-01-369-9125?

There are 5 known substitutes for 4320-01-369-9125: 2990-00-258-6486, 4310-00-532-3832, 3110-00-554-5407 and 2 more. Verify interchangeability with system specifications before substitution.

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