The O-Ring, cataloged under National Stock Number 5331-01-288-1821, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Airbus Helicopters (ets De Marignane). Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5331-01-288-1821 |
| Primary Part Number | MS9388-253 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Airbus Helicopters (ets De Marignane) |
| Status | ACTIVE |
| Cross-Sectional Height | 0.139 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN |
| Center Hole Diameter | 5.334 INCHES MINIMUM AND 5.382 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROCARBON CLASS FPM |
| 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 |
|---|---|
| MS9388-253 | Airbus Helicopters (ets De Marignane) (FRA) |
| N7425068253 | Airbus Helicopters (ets De Marignane) (FRA) |
| Reference | Meaning |
|---|---|
| MS9388-253 | 2/2 Government specification standardization U.S. Government activity |
NSN 5331-01-288-1821 is a O-Ring, manufactured by Airbus Helicopters (ets De Marignane), classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-288-1821 has 2 manufacturer part numbers on file: MS9388-253 (Airbus Helicopters (ets De Marignane)), N7425068253 (Airbus Helicopters (ets De Marignane)).
Key specifications for MS9388-253: Cross-Sectional Height: 0.139 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN; Center Hole Diameter: 5.334 INCHES MINIMUM AND 5.382 INCHES MAXIMUM IN; Material: RUBBER FLUOROCARBON CLASS FPM. 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.