The Seat,valve, cataloged under National Stock Number 4820-01-235-1458, 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 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-235-1458 |
| Primary Part Number | 4327F PIECE 3 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| Status | ACTIVE |
| Body Outside Diameter | 4.875 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Material Document and Classification | MIL-E-1675A MIL SPEC SINGLE MATERIAL RESPONSE SEAT A |
| Material | STEEL CORROSION RESISTING SEAT |
| 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 |
|---|---|
| 4327F PIECE 3 PRIMARY | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
| Reference | Meaning |
|---|---|
| 4327F3 | C/1 Advisory reference — outside the item-of-supply concept Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
NSN 4820-01-235-1458 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 4820-01-235-1458 has 1 manufacturer part number on file: 4327F PIECE 3 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).
Key specifications for 4327F PIECE 3: Overall Height: 0.500 INCHES NOMINAL IN; Body Outside Diameter: 4.875 INCHES NOMINAL IN; Style Designator: PLAIN; Material Document and Classification: MIL-E-1675A MIL SPEC SINGLE MATERIAL RESPONSE SEAT A. 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.
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.