The Seat,valve, cataloged under National Stock Number 4820-01-190-5891, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-190-5891 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.593 INCHES NOMINAL IN |
| Flange Diameter | 4.000 INCHES NOMINAL IN |
| Thread Length | 0.496 INCHES MINIMUM AND 0.501 INCHES MAXIMUM SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Material Document and Classification | ASTM A351/CF8M ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 2.969 INCHES NOMINAL IN |
| Nominal Thread Size | 3.625 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.688 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | STEEL CORROSION RESISTING OVERALL |
| Seat Angle in Deg | 30.000 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 |
| Reference | Meaning |
|---|---|
| D50092 ITEM 4 | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| D50092 ITEM 4 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| A49529MEB | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| A49529MEB | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| D50092 | D/9 Drawing number reference only Hunt Valve Company Inc Dba Union Flonetics |
NSN 4820-01-190-5891 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-190-5891: Flange Seat to Disk End Height: 0.593 INCHES NOMINAL IN; Flange Diameter: 4.000 INCHES NOMINAL IN; Thread Length: 0.496 INCHES MINIMUM AND 0.501 INCHES MAXIMUM SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 14 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.