PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21800O-Ring

Westerbeke Corporation · NSN 5331-01-211-0465 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-01-211-0465 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-211-0465. Primary manufacturer part number: 21800.
Features
  • O-Ring — FSC 5331
  • 1 verified cross-reference
  • Primary manufacturer: Westerbeke Corporation
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The O-Ring, cataloged under National Stock Number 5331-01-211-0465, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Westerbeke Corporation. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameO-Ring
FSC / FSG5331 — O-Ring (FSG 53)
ManufacturersWesterbeke Corporation (CAGE 03798)
Technical Specifications
ParameterValue
NSN5331-01-211-0465
Primary Part Number21800
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerWesterbeke Corporation
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
5935-00-295-64037321299 INTERCHANGEABLE
Connector,receptacle,electrical
U S Army Tank Automotive Command Amsta-Im-Mm
1680-00-373-286221800 INTERCHANGEABLE
Grip,cyclic Stick
Mason Electric Co. Dba Mason Controls
5821-00-510-3156 INTERCHANGEABLE
Base Assy
3455-00-540-273121800 INTERCHANGEABLE
Blade,hole Saw
Black and Decker Us Inc
5950-01-038-7661 INTERCHANGEABLE
Coil,electrical
5962-01-167-787354LS175DM INTERCHANGEABLE
Microcircuit,digital
Fairchild Semiconductor Corp
4420-01-275-624321800 INTERCHANGEABLE
Core Assembly,fluid Cooler
Coffin Turbo Pump Inc
5330-01-325-524421800 INTERCHANGEABLE
Gasket
L3 Technologies, Inc.
5895-01-383-740621800 INTERCHANGEABLE
Modem,communications
Motorola/codex Corp Sub of Motorola Inc
3020-01-419-641721800 INTERCHANGEABLE
Gear,spur
Elbitamerica, Inc.
Cross-Reference Index
Part NumberManufacturer
21800 PRIMARY Westerbeke Corporation (USA)
Related Parts
5935-00-295-6403INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
7321299
1680-00-373-2862INTERCHANGEABLE
GRIP,CYCLIC STICK
21800
5821-00-510-3156INTERCHANGEABLE
BASE ASSY
3455-00-540-2731INTERCHANGEABLE
BLADE,HOLE SAW
21800
5950-01-038-7661INTERCHANGEABLE
COIL,ELECTRICAL
5962-01-167-7873INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
54LS175DM
4420-01-275-6243INTERCHANGEABLE
CORE ASSEMBLY,FLUID COOLER
21800
5330-01-325-5244INTERCHANGEABLE
GASKET
21800
5895-01-383-7406INTERCHANGEABLE
MODEM,COMMUNICATIONS
21800
3020-01-419-6417INTERCHANGEABLE
GEAR,SPUR
21800
5120-01-671-8439INTERCHANGEABLE
VISE,MACHINIST'S
21800

Frequently Asked Questions

What is NSN 5331-01-211-0465?

NSN 5331-01-211-0465 is a O-Ring, manufactured by Westerbeke Corporation, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-01-211-0465?

NSN 5331-01-211-0465 has 1 cross-referenced part number: 21800 (Westerbeke Corporation).

What NSN replaces 5331-01-211-0465?

There are 11 known substitutes for 5331-01-211-0465: 5935-00-295-6403, 1680-00-373-2862, 5821-00-510-3156 and 8 more. Verify interchangeability with system specifications before substitution.

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