PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1943-4O-Ring

Circor Aerospace, Inc. Dba Circor Aerospace Inc · NSN 5331-01-232-4273 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-01-232-4273 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-232-4273. Primary manufacturer part number: 1943-4.
Features
  • O-Ring — FSC 5331
  • Material: PLASTIC POLYTETRAFLUOROETHYLENE
  • 1 verified cross-reference
  • Primary manufacturer: Circor Aerospace, Inc. Dba Circor Aerospace Inc
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
  • Applications requiring Plastic Polytetrafluoroethylene construction
General Description

The O-Ring, cataloged under National Stock Number 5331-01-232-4273, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Circor Aerospace, Inc. Dba Circor Aerospace Inc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5331-01-232-4273
Primary Part Number1943-4
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerCircor Aerospace, Inc. Dba Circor Aerospace Inc
StatusACTIVE
MaterialPLASTIC POLYTETRAFLUOROETHYLENE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5120-00-098-4456 INTERCHANGEABLE
Driver,seal Install
5325-00-123-87203M336-4 INTERCHANGEABLE
Ring,retaining
The Boeing Company Div Defense
5325-00-124-23713M394-4 INTERCHANGEABLE
Ring,retaining
The Boeing Company Div Defense
5945-00-456-4143 INTERCHANGEABLE
Relay,electromagnetic
5340-01-383-4120 INTERCHANGEABLE
Cover,access
1005-01-584-4691 INTERCHANGEABLE
Adapter,gun Mounting
Cross-Reference Index
Part NumberManufacturer
1943-4 PRIMARY Circor Aerospace, Inc. Dba Circor Aerospace Inc (USA)
Related Parts
5120-00-098-4456INTERCHANGEABLE
DRIVER,SEAL INSTALL
5325-00-123-8720INTERCHANGEABLE
RING,RETAINING
3M336-4
5325-00-124-2371INTERCHANGEABLE
RING,RETAINING
3M394-4
5945-00-456-4143INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5340-01-383-4120INTERCHANGEABLE
COVER,ACCESS
1005-01-584-4691INTERCHANGEABLE
ADAPTER,GUN MOUNTING

Frequently Asked Questions

What is NSN 5331-01-232-4273?

NSN 5331-01-232-4273 is a O-Ring, manufactured by Circor Aerospace, Inc. Dba Circor Aerospace Inc, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-01-232-4273?

NSN 5331-01-232-4273 has 1 cross-referenced part number: 1943-4 (Circor Aerospace, Inc. Dba Circor Aerospace Inc).

What NSN replaces 5331-01-232-4273?

There are 6 known substitutes for 5331-01-232-4273: 5120-00-098-4456, 5325-00-123-8720, 5325-00-124-2371 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1943-4?

Key specifications for 1943-4: Material: PLASTIC POLYTETRAFLUOROETHYLENE. 1 total characteristics are documented in the Federal Logistics Information System.

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