The Retainer,seat,valve, cataloged under National Stock Number 4820-01-066-6553, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4820-01-066-6553 |
| Primary Part Number | SS845-2050575PC9 |
| Item Name | Retainer,seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outside Diameter | 4.875 INCHES NOMINAL IN |
| Valve Design Control Activity | 53711 |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| SS845-2050575PC9 PRIMARY | Naval Sea Systems Command (USA) |
| SS845-2050575PC9 PRIMARY | Portland Valve Llc (USA) |
| Reference | Meaning |
|---|---|
| SS845-2050575 P | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| SS845-2050575 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-066-6553 is a Retainer,seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-066-6553 has 2 manufacturer part numbers on file: SS845-2050575PC9 (Naval Sea Systems Command), SS845-2050575PC9 (Portland Valve Llc).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-066-9526. Verify interchangeability with system specifications before substitution.
Key specifications for SS845-2050575PC9: Outside Diameter: 4.875 INCHES NOMINAL IN; Valve Design Control Activity: 53711; Material: NICKEL ALLOY. 3 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.
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.