The O-Ring, cataloged under National Stock Number 5331-01-645-7987, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Naval Inventory Control Point Mechanicsburg (CAGE 03950) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-645-7987 |
| Primary Part Number | 4410591-9100 CP |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 4410591-9100 CP | Naval Inventory Control Point Mechanicsburg (USA) |
| FVL4E2-002-8 ITEM NO 61 CP | Naval Inventory Control Point Mechanicsburg (USA) |
| AS3581-910 CP | Naval Inventory Control Point Mechanicsburg (USA) |
| FVL4E2-003-8 ITEM NO 61 CP | Naval Inventory Control Point Mechanicsburg (USA) |
| FVL4E2-001-8 ITEM NO 61 CP | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| FVL4E2-003-8 ITEM NO 61 | 5/1 Secondary reference U.S. Government activity |
| 4410591-9100 | 5/1 Secondary reference U.S. Government activity |
| FVL4E2-001-8 ITEM NO 61 | 5/1 Secondary reference U.S. Government activity |
| FVL4E2-002-8 ITEM NO 61 | 5/1 Secondary reference U.S. Government activity |
| AS3581-910 | 5/9 Secondary reference U.S. Government activity |
| AS3581-910 | 3/1 Design control — primary reference Sae International Dba Sae International |
NSN 5331-01-645-7987 is a O-Ring, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-645-7987 has 5 manufacturer part numbers on file: 4410591-9100 CP (Naval Inventory Control Point Mechanicsburg), FVL4E2-002-8 ITEM NO 61 CP (Naval Inventory Control Point Mechanicsburg), AS3581-910 CP (Naval Inventory Control Point Mechanicsburg), FVL4E2-003-8 ITEM NO 61 CP (Naval Inventory Control Point Mechanicsburg), FVL4E2-001-8 ITEM NO 61 CP (Naval Inventory Control Point Mechanicsburg).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-721-2775. 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.