The O-Ring, cataloged under National Stock Number 5331-01-329-1880, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Allied Systems Company Dba Allied Systems Co. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Allied Systems Company Dba Allied Systems Co (CAGE 60848) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-329-1880 |
| Primary Part Number | 33645 ITEM 5 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Allied Systems Company Dba Allied Systems Co |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 33645 ITEM 5 PRIMARY | Allied Systems Company Dba Allied Systems Co (USA) |
| Reference | Meaning |
|---|---|
| 33674 | 5/9 Secondary reference Allied Systems Company Dba Allied Systems Co |
NSN 5331-01-329-1880 is a O-Ring, manufactured by Allied Systems Company Dba Allied Systems Co, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-329-1880 has 1 manufacturer part number on file: 33645 ITEM 5 (Allied Systems Company Dba Allied Systems Co).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-407-3547. Verify interchangeability with system specifications before substitution.
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.