PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

R21O-Ring

Caro, Inc. Dba South Bend Lathe · NSN 5331-01-304-3465 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-01-304-3465 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-304-3465. Primary manufacturer part number: R21.
Features
  • O-Ring — FSC 5331
  • 1 verified cross-reference
  • Primary manufacturer: Caro, Inc. Dba South Bend Lathe
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The O-Ring, cataloged under National Stock Number 5331-01-304-3465, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Caro, Inc. Dba South Bend Lathe. 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)
ManufacturersCaro, Inc. Dba South Bend Lathe (CAGE 55985)
Technical Specifications
ParameterValue
NSN5331-01-304-3465
Primary Part NumberR21
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerCaro, Inc. Dba South Bend Lathe
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
9905-00-057-3262R211518X24HA INTERCHANGEABLE
Sign,traffic
Federal Prison Industries, Inc
2590-00-102-3053658555 INTERCHANGEABLE
Control Assembly,push-Pull
Caterpillar Inc Div Caterpillar Defense
9905-00-336-9025R211018X24HA INTERCHANGEABLE
Sign,traffic
Federal Prison Industries, Inc
2910-00-390-8779 INTERCHANGEABLE
Parts Kit,engine Fuel Pump
4240-01-048-3096423785-2 INTERCHANGEABLE
Cartridge,respirator,air Filteri
Naval Air Warfare Center Aircraft Division Joint Base Jbmdl
9905-01-074-94129905010749412 INTERCHANGEABLE
Sign,traffic
Federal Prison Industries, Inc
6810-01-190-2730 INTERCHANGEABLE
Rhodamine B
4240-01-249-5540 INTERCHANGEABLE
Cartridge,respirator,air Filteri
2520-01-267-6052J3192340 INTERCHANGEABLE
Torque Converter,vehicular
Chrysler Corp Engine and Components Sales Diversified Products Div
5945-01-294-9692R21 INTERCHANGEABLE
Relay,hybrid
Versitron Inc
Cross-Reference Index
Part NumberManufacturer
R21 PRIMARY Caro, Inc. Dba South Bend Lathe (USA)
Related Parts
9905-00-057-3262INTERCHANGEABLE
SIGN,TRAFFIC
R211518X24HA
2590-00-102-3053INTERCHANGEABLE
CONTROL ASSEMBLY,PUSH-PULL
658555
9905-00-336-9025INTERCHANGEABLE
SIGN,TRAFFIC
R211018X24HA
2910-00-390-8779INTERCHANGEABLE
PARTS KIT,ENGINE FUEL PUMP
4240-01-048-3096INTERCHANGEABLE
CARTRIDGE,RESPIRATOR,AIR FILTERI
423785-2
9905-01-074-9412INTERCHANGEABLE
SIGN,TRAFFIC
9905010749412
6810-01-190-2730INTERCHANGEABLE
RHODAMINE B
4240-01-249-5540INTERCHANGEABLE
CARTRIDGE,RESPIRATOR,AIR FILTERI
2520-01-267-6052INTERCHANGEABLE
TORQUE CONVERTER,VEHICULAR
J3192340
5945-01-294-9692INTERCHANGEABLE
RELAY,HYBRID
R21
5975-01-460-6572INTERCHANGEABLE
ADAPTER,ELECTRICAL CONDUIT
R-21

Frequently Asked Questions

What is NSN 5331-01-304-3465?

NSN 5331-01-304-3465 is a O-Ring, manufactured by Caro, Inc. Dba South Bend Lathe, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-01-304-3465?

NSN 5331-01-304-3465 has 1 cross-referenced part number: R21 (Caro, Inc. Dba South Bend Lathe).

What NSN replaces 5331-01-304-3465?

There are 11 known substitutes for 5331-01-304-3465: 9905-00-057-3262, 2590-00-102-3053, 9905-00-336-9025 and 8 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com