The Disk,valve, cataloged under National Stock Number 4820-01-386-7444, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-386-7444 |
| Primary Part Number | DF6503-172 FN 35SS |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Outside Diameter | 17.730 INCHES NOMINAL IN |
| Criticality Code Justification | ZZZY |
| Material | TITANIUM ALLOY |
| Reference Number Differentiating Characteristics | QUALITY CONTROLLED IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR SUBSAFE ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| DF6503-172 FN 35SS | Naval Inventory Control Point Mechanicsburg (USA) |
| 512-6404651 FN 35SS | Naval Sea Systems Command (USA) |
| 211047160SS | Naval Inventory Control Point Mechanicsburg (USA) |
| 6404651 FN 35SS | Naval Inventory Control Point Mechanicsburg (USA) |
| 6404649 FN 38SS | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| DF6503-172 FN 35 | 3/1 Design control — primary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 211047160 | 5/1 Secondary reference Naval Sea Systems Command |
| 6404649 FN 38 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4820-01-386-7444 is a Disk,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-386-7444 has 5 manufacturer part numbers on file: DF6503-172 FN 35SS (Naval Inventory Control Point Mechanicsburg), 512-6404651 FN 35SS (Naval Sea Systems Command), 211047160SS (Naval Inventory Control Point Mechanicsburg), 6404651 FN 35SS (Naval Inventory Control Point Mechanicsburg), 6404649 FN 38SS (Naval Inventory Control Point Mechanicsburg).
Key specifications for DF6503-172 FN 35SS: Overall Height: 5.650 INCHES NOMINAL IN; Outside Diameter: 17.730 INCHES NOMINAL IN; Criticality Code Justification: ZZZY; End Item Identification: HULL VALVE. 4 specifications are 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.
NSN 4820-01-386-7444 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.