The O-Ring, cataloged under National Stock Number 5331-01-241-3551, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Perko Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5331-01-241-3551 |
| Primary Part Number | 513-8 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Perko Inc |
| Status | ACTIVE |
| Material | RUBBER CHLOROPRENE CLASS CR |
| 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 |
|---|---|
| 513-8 PRIMARY | Perko Inc (USA) |
| Reference | Meaning |
|---|---|
| 528-99B-8 | 5/9 Secondary reference Perko Inc |
NSN 5331-01-241-3551 is a O-Ring, manufactured by Perko Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-241-3551 has 1 manufacturer part number on file: 513-8 (Perko Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5920-01-496-6607, 1375-01-628-0028. Verify interchangeability with system specifications before substitution.
Key specifications for 513-8: Material: RUBBER CHLOROPRENE CLASS CR. 1 specification is 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.