PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

25-121O-Ring

Stewart & Stevenson Power Products Llc · NSN 5331-01-091-8473 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-01-091-8473 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-091-8473. Primary manufacturer part number: 25-121.
Features
  • O-Ring — FSC 5331
  • 2 verified cross-references
  • Primary manufacturer: Stewart & Stevenson Power Products Llc
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The O-Ring, cataloged under National Stock Number 5331-01-091-8473, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Stewart & Stevenson Power Products Llc. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameO-Ring
FSC / FSG5331 — O-Ring (FSG 53)
ManufacturersStewart & Stevenson Power Products Llc (CAGE 81381); Jednolity Indeks Materialowy - Uniform Material Index (CAGE 9009H)
Technical Specifications
ParameterValue
NSN5331-01-091-8473
Primary Part Number25-121
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerStewart & Stevenson Power Products Llc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
4820-00-032-882625121 INTERCHANGEABLE
Seat,valve
Meggitt North Hollywood Inc
4530-00-080-734825121 INTERCHANGEABLE
Piston Assembly,fuel Unit
Danfoss Inc
5133-00-228-1332 INTERCHANGEABLE
Drill,twist
5360-00-263-456325121 INTERCHANGEABLE
Spring,helical,compression
Honeywell International Inc. Div Aerospace - Torrance
5330-00-715-5144 INTERCHANGEABLE
Gasket
3455-01-236-792425121 INTERCHANGEABLE
Cutter,milling,end
Niagara Cutter Inc
6685-01-426-4789251-21 INTERCHANGEABLE
Thermometer,indicating,capillary
Shinko Ind. Ltd
4720-01-537-7776 INTERCHANGEABLE
Hose Assembly,nonmetallic
Cross-Reference Index
Part NumberManufacturer
25-121 PRIMARY Stewart & Stevenson Power Products Llc (USA)
5331PL0955295 Jednolity Indeks Materialowy - Uniform Material Index (POL)
Related Parts
4820-00-032-8826INTERCHANGEABLE
SEAT,VALVE
25121
4530-00-080-7348INTERCHANGEABLE
PISTON ASSEMBLY,FUEL UNIT
25121
5133-00-228-1332INTERCHANGEABLE
DRILL,TWIST
5360-00-263-4563INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
25121
5330-00-715-5144INTERCHANGEABLE
GASKET
3455-01-236-7924INTERCHANGEABLE
CUTTER,MILLING,END
25121
6685-01-426-4789INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
251-21
4720-01-537-7776INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC

Frequently Asked Questions

What is NSN 5331-01-091-8473?

NSN 5331-01-091-8473 is a O-Ring, manufactured by Stewart & Stevenson Power Products Llc, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-01-091-8473?

NSN 5331-01-091-8473 has 2 cross-referenced part numbers: 25-121 (Stewart & Stevenson Power Products Llc), 5331PL0955295 (Jednolity Indeks Materialowy - Uniform Material Index).

What NSN replaces 5331-01-091-8473?

There are 8 known substitutes for 5331-01-091-8473: 4820-00-032-8826, 4530-00-080-7348, 5133-00-228-1332 and 5 more. Verify interchangeability with system specifications before substitution.

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