PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20A11-X-M-443O-Ring

Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss Wright Engineered Pump Division Use CAGE Code 0ubg9 for Cataloging · NSN 5331-01-304-9821 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-01-304-9821 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-304-9821. Primary manufacturer part number: 20A11-X-M-443.
Features
  • O-Ring — FSC 5331
  • Cross-Sectional Height: 0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
  • Criticality Code Justification: ZZZW
  • Elongation Percentage: 160 MAXIMUM
  • Center Hole Diameter: 7.445 INCHES MINIMUM AND 7.505 INCHES MAXIMUM IN
  • Temp Rating: -65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
  • Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
  • Peripheral Diameter: 8.025 INCHES NOMINAL IN
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
  • Applications requiring Rubber Butadiene-Acrylonitrile Class Nbr construction
General Description

The O-Ring, cataloged under National Stock Number 5331-01-304-9821, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss Wright Engineered Pump Division Use CAGE Code 0ubg9 for Cataloging. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 8 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5331-01-304-9821
Primary Part Number20A11-X-M-443
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerCurtiss-Wright Electro-Mechanical Corporation Dba Curtiss Wright Engineered Pump Division Use CAGE Code 0ubg9 for Cataloging
StatusACTIVE
Cross-Sectional Height0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
Criticality Code JustificationZZZW
Elongation Percentage160 MAXIMUM
Center Hole Diameter7.445 INCHES MINIMUM AND 7.505 INCHES MAXIMUM IN
Temp Rating-65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
MaterialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
Peripheral Diameter8.025 INCHES NOMINAL IN
Departure From Cited DocumentMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
5331-00-815-2450MS28775-443 INTERCHANGEABLE
O-Ring
Sae International Dba Sae International
Cross-Reference Index
Part NumberManufacturer
20A11-X-M-443 Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss Wright Engineered Pump Division Use CAGE Code 0ubg9 for Cataloging (USA)
MS28775-443 Sae International Dba Sae International (USA)
PL-10022-F-18ITEM456E Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss Wright Engineered Pump Division Use CAGE Code 0ubg9 for Cataloging (USA)
MS28775-443 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
PL-10022-F-18ITEM456E Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA)
20A11-X-M-443 Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA)
SAE-AS28775 Sae International Dba Sae International (USA)
MS28775-443 Society of Automotive Engineers Inc (USA)
Related Parts
5331-00-815-2450INTERCHANGEABLE
O-RING
MS28775-443

Frequently Asked Questions

What is NSN 5331-01-304-9821?

NSN 5331-01-304-9821 is a O-Ring, manufactured by Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss Wright Engineered Pump Division Use CAGE Code 0ubg9 for Cataloging, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-01-304-9821?

NSN 5331-01-304-9821 has 8 cross-referenced part numbers: 20A11-X-M-443 (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss Wright Engineered Pump Division Use CAGE Code 0ubg9 for Cataloging), MS28775-443 (Sae International Dba Sae International), PL-10022-F-18ITEM456E (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss Wright Engineered Pump Division Use CAGE Code 0ubg9 for Cataloging), MS28775-443 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), PL-10022-F-18ITEM456E (Curtiss-Wright Electro-Mechanical Corporation Div Epd) and 3 more.

What NSN replaces 5331-01-304-9821?

There is 1 known substitute for 5331-01-304-9821: 5331-00-815-2450. Verify interchangeability with system specifications before substitution.

What are the specifications of 20A11-X-M-443?

Key specifications for 20A11-X-M-443: Cross-Sectional Height: 0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN; Criticality Code Justification: ZZZW; Elongation Percentage: 160 MAXIMUM; Center Hole Diameter: 7.445 INCHES MINIMUM AND 7.505 INCHES MAXIMUM IN. 8 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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