The O-Ring, cataloged under National Stock Number 5331-01-477-2520, 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4 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-477-2520 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Status | ACTIVE |
| Temp Rating | -15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF |
| Hardness Rating | 75.0 SHORE DUROMETER A NOMINAL |
| Material Document and Classification | MIL-R-83248,CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE |
| 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 |
| Reference | Meaning |
|---|---|
| V3D10334 ITEM 29 | 5/9 Secondary reference U.S. Government activity |
| AC180-553 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5331-01-477-2520 is a O-Ring, classified under FSC 5331, O-ring. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5331-01-559-2098. Verify interchangeability with system specifications before substitution.
Key specifications for 5331-01-477-2520: Temp Rating: -15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF; Hardness Rating: 75.0 SHORE DUROMETER A NOMINAL; Material Document and Classification: MIL-R-83248,CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE; Material: RUBBER FLUOROCARBON CLASS FPM. 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.