PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4201B-1.50IN-SE-61992-PC8O-Ring

William Powell Company, the Dba Powell Valve Div the Starflo Corporation · NSN 5331-01-284-7891 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-01-284-7891 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-284-7891. Primary manufacturer part number: 4201B-1.50IN-SE-61992-PC8.
Features
  • O-Ring — FSC 5331
  • 2 verified cross-references
  • Primary manufacturer: William Powell Company, the Dba Powell Valve Div the Starflo Corporation
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The O-Ring, cataloged under National Stock Number 5331-01-284-7891, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is William Powell Company, the Dba Powell Valve Div the Starflo Corporation. 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 NameO-Ring
FSC / FSG5331 — O-Ring (FSG 53)
ManufacturersWilliam Powell Company, the Dba Powell Valve Div the Starflo Corporation (CAGE 48422); Worcester Controls Corp P O Box 2609 Cookeville Tn 385022609 (CAGE 98991)
Technical Specifications
ParameterValue
NSN5331-01-284-7891
Primary Part Number4201B-1.50IN-SE-61992-PC8
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerWilliam Powell Company, the Dba Powell Valve Div the Starflo Corporation
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5330-00-285-9436 INTERCHANGEABLE
Seal,plain Encased
5360-00-946-0072 INTERCHANGEABLE
Spring,helical,compression
5310-01-205-2524 INTERCHANGEABLE
Washer
4730-01-213-9585STBC10GG-128 INTERCHANGEABLE
Clamp,hose
The Boeing Company Div Defense
4540-01-348-38469256 INTERCHANGEABLE
Heating Unit
Onyx Spectrum Technology Inc Dba Onyx Spectrum Technology
Cross-Reference Index
Part NumberManufacturer
4201B-1.50IN-SE-61992-PC8 William Powell Company, the Dba Powell Valve Div the Starflo Corporation (USA)
9256 Worcester Controls Corp P O Box 2609 Cookeville Tn 385022609 (USA)
Related Parts
5330-00-285-9436INTERCHANGEABLE
SEAL,PLAIN ENCASED
5360-00-946-0072INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
5310-01-205-2524INTERCHANGEABLE
WASHER
4730-01-213-9585INTERCHANGEABLE
CLAMP,HOSE
STBC10GG-128
4540-01-348-3846INTERCHANGEABLE
HEATING UNIT
9256

Frequently Asked Questions

What is NSN 5331-01-284-7891?

NSN 5331-01-284-7891 is a O-Ring, manufactured by William Powell Company, the Dba Powell Valve Div the Starflo Corporation, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-01-284-7891?

NSN 5331-01-284-7891 has 2 cross-referenced part numbers: 4201B-1.50IN-SE-61992-PC8 (William Powell Company, the Dba Powell Valve Div the Starflo Corporation), 9256 (Worcester Controls Corp P O Box 2609 Cookeville Tn 385022609).

What NSN replaces 5331-01-284-7891?

There are 5 known substitutes for 5331-01-284-7891: 5330-00-285-9436, 5360-00-946-0072, 5310-01-205-2524 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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