The Seat,valve, cataloged under National Stock Number 4820-01-303-9249, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-303-9249 |
| Primary Part Number | 20147-F PIECE 7 AND 8 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.312 INCHES NOMINAL IN |
| Flange Diameter | 6.125 INCHES NOMINAL IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 5.000 INCHES NOMINAL IN |
| Nominal Thread Size | 5.750 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 1.125 INCHES NOMINAL IN |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UN SINGLE THREADED PORTION |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 20147-F PIECE 7 AND 8 PRIMARY | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
| 20147-F | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
| Reference | Meaning |
|---|---|
| 20147F7X8 | C/1 Advisory reference — outside the item-of-supply concept Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
NSN 4820-01-303-9249 is a Seat,valve, manufactured by Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-303-9249 has 2 manufacturer part numbers on file: 20147-F PIECE 7 AND 8 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa), 20147-F (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).
Key specifications for 20147-F PIECE 7 AND 8: Flange Seat to Disk End Height: 0.312 INCHES NOMINAL IN; Flange Diameter: 6.125 INCHES NOMINAL IN; Style Designator: THREADED FLANGED; Body Inside Diameter: 5.000 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.