The Seat,valve, cataloged under National Stock Number 4820-01-215-4398, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-215-4398 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Thread Length | 1.188 INCHES NOMINAL FIRST THREADED PORTION IN |
| Thread Length | 1.250 INCHES NOMINAL SECOND THREADED PORTION IN |
| Criticality Code Justification | ZZZY |
| Style Designator | DOUBLE FLANGED |
| Body Inside Diameter | 2.000 INCHES MINIMUM AND 2.001 INCHES MAXIMUM IN |
| Nominal Thread Size | 2.625 INCHES FIRST THREADED PORTION IN |
| Nominal Thread Size | 3.125 INCHES SECOND THREADED PORTION IN |
| Thread Class | 2A SECOND THREADED PORTION A |
| Thread Class | 2A FIRST THREADED PORTION A |
| Thread Quantity Per Inch | 14 FIRST THREADED PORTION |
| Thread Quantity Per Inch | 14 SECOND THREADED PORTION |
| Material | STEEL COMP 316L OVERALL |
| Seat Angle in Deg | 45.000 MINIMUM AND 45.083 MAXIMUM |
| Thread Series Designator | UNS FIRST THREADED PORTION |
| Thread Series Designator | UNS SECOND THREADED PORTION |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| 20189 PIECE 5 | 5/1 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| B10393.002.108 | 3/1 Design control — primary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-01-215-4398 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-215-4398: Overall Height: 2.688 INCHES NOMINAL IN; Thread Length: 1.188 INCHES NOMINAL FIRST THREADED PORTION IN; Thread Length: 1.250 INCHES NOMINAL SECOND THREADED PORTION IN; Criticality Code Justification: ZZZY. 17 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.
NSN 4820-01-215-4398 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
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.