The Seat,valve, cataloged under National Stock Number 4820-01-433-4438, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-433-4438 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Body Outside Diameter | 4.801 INCHES MINIMUM AND 4.813 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Material Document and Classification | ASTM B164 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A494, GRADE -30H ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Body Inside Diameter | 3.938 INCHES NOMINAL IN |
| Nominal Thread Size | 4.813 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY SEAT |
| Thread Series Designator | UNS 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 |
| Reference | Meaning |
|---|---|
| 1305-016-4IN ITEM 13 | 5/9 Secondary reference U.S. Government activity |
| 2177917 | D/9 Drawing number reference only U.S. Government activity |
| 1305-034 4IN IT 13 | C/1 Advisory reference — outside the item-of-supply concept Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
| 803-2177917-04-30 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-433-4438 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-433-4438: Overall Height: 0.688 INCHES NOMINAL IN; Body Outside Diameter: 4.801 INCHES MINIMUM AND 4.813 INCHES MAXIMUM IN; Style Designator: PLAIN; Material Document and Classification: ASTM B164 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A494, GRADE -30H ASSN STD SINGLE MATERIAL RESPONSE SEAT. 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.