The O-Ring, cataloged under National Stock Number 5331-01-494-4559, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-494-4559 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Status | ACTIVE |
| Cross-Sectional Height | 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN |
| Material Document and Classification | 81349,-25988/4 MIL SPEC SINGLE MATERIAL RESPONSE |
| Center Hole Diameter | 0.292 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROSILICONE CLASS FQ |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 5331PL2228284 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 2-109L1218-80 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| 2-109 L806-80 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| M25988/4-109 | 2/2 Government specification standardization U.S. Government activity |
| MIL-R-25988 | 5/9 Secondary reference U.S. Government activity |
| AMS-R-25988 | 5/9 Secondary reference U.S. Government activity |
| AMS-R-25988 | 5/1 Secondary reference Sae International Dba Sae International |
| 2-109 L1007-80 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| MIL-DTL-25988/4 | 4/1 Identification reference U.S. Government activity |
| L1218 2-109 | 5/1 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
NSN 5331-01-494-4559 is a O-Ring, classified under FSC 5331, O-ring. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5331-01-494-9943, 5331-01-502-7567, 5331-01-503-0357. Verify interchangeability with system specifications before substitution.
Key specifications for 5331-01-494-4559: Cross-Sectional Height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN; Material Document and Classification: 81349,-25988/4 MIL SPEC SINGLE MATERIAL RESPONSE; Center Hole Diameter: 0.292 INCHES MINIMUM AND 0.306 INCHES MAXIMUM IN; Material: RUBBER FLUOROSILICONE CLASS FQ. 4 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.