The O-Ring, cataloged under National Stock Number 5331-01-481-8071, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Div Epd. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-481-8071 |
| Primary Part Number | 20A11-EP-M231 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| Status | ACTIVE |
| Cross-Sectional Height | 0.125 INCHES NOMINAL IN |
| Center Hole Diameter | 2.250 INCHES NOMINAL IN |
| Material | RUBBER ETHYLENE-PROPYLENE CLASS EPM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 20A11-EP-M231 PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| Reference | Meaning |
|---|---|
| 20A11-EP-M231 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5331-01-481-8071 is a O-Ring, manufactured by Curtiss-Wright Electro-Mechanical Corporation Div Epd, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-481-8071 has 1 manufacturer part number on file: 20A11-EP-M231 (Curtiss-Wright Electro-Mechanical Corporation Div Epd).
Key specifications for 20A11-EP-M231: Cross-Sectional Height: 0.125 INCHES NOMINAL IN; Center Hole Diameter: 2.250 INCHES NOMINAL IN; End Item Identification: PUMP UNIT,CENTRIFUGAL-4320-01-213-1036; Material: RUBBER ETHYLENE-PROPYLENE CLASS EPM. 3 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.