The O-Ring, cataloged under National Stock Number 5331-01-621-0730, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Hii Unmanned Systems, Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Hii Unmanned Systems, Inc (CAGE 4Z5A9) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-621-0730 |
| Primary Part Number | 28-904 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Hii Unmanned Systems, Inc |
| 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 |
|---|---|
| 28-904 PRIMARY | Hii Unmanned Systems, Inc (USA) |
| Reference | Meaning |
|---|---|
| 28-904 | 3/9 Design control — primary reference Hydroid, Llc |
NSN 5331-01-621-0730 is a O-Ring, manufactured by Hii Unmanned Systems, Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-621-0730 has 1 manufacturer part number on file: 28-904 (Hii Unmanned Systems, Inc).
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.