The Seat,valve, cataloged under National Stock Number 4820-01-169-9681, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Tate Andale, Llc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-169-9681 |
| Primary Part Number | 6559-48#AY 99 PC9 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Tate Andale, Llc |
| Status | ACTIVE |
| Thread Length | 0.250 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | PLAIN THREADED |
| Body Inside Diameter | 3.375 INCHES NOMINAL IN |
| Nominal Thread Size | 3.688 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| Thread Series Designator | UN SINGLE THREADED PORTION |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| 6559-48#AY 99 PC9 PRIMARY | Tate Andale, Llc (USA) |
| Reference | Meaning |
|---|---|
| 6559-48 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 517-4325727 | D/9 Drawing number reference only U.S. Government activity |
| 6559-48 PIECE 9 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 517-4325727 PIECE 9 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-169-9681 is a Seat,valve, manufactured by Tate Andale, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-169-9681 has 1 manufacturer part number on file: 6559-48#AY 99 PC9 (Tate Andale, Llc).
Key specifications for 6559-48#AY 99 PC9: Overall Height: 0.375 INCHES NOMINAL IN; Thread Length: 0.250 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: PLAIN THREADED; Body Inside Diameter: 3.375 INCHES NOMINAL IN. 10 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.