The O-Ring, cataloged under National Stock Number 5331-01-721-5656, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Parker-Hannifin Corp Div O-Ring Division. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Parker-Hannifin Corp Div O-Ring Division (CAGE 02697) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-721-5656 |
| Primary Part Number | N1470 2-281 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parker-Hannifin Corp Div O-Ring Division |
| Status | ACTIVE |
| 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 |
|---|---|
| N1470 2-281 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| Reference | Meaning |
|---|---|
| 21222365 | D/9 Drawing number reference only U.S. Government activity |
| 56015600 | 5/2 Secondary reference U.S. Government activity |
| 21222365 REV G FIND NO 33 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| SDRL VAC DWG 21222365 SQ NO A033 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5331-01-721-5656 is a O-Ring, manufactured by Parker-Hannifin Corp Div O-Ring Division, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-721-5656 has 1 manufacturer part number on file: N1470 2-281 (Parker-Hannifin Corp Div O-Ring Division).
2 possible matches (shared part number, not a government interchangeability claim): 5330-01-723-5209, 5331-01-724-1621. 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.