The Seat,valve, cataloged under National Stock Number 4820-01-216-8844, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-216-8844 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.375 INCHES NOMINAL IN |
| Flange Diameter | 1.795 INCHES MINIMUM AND 1.805 INCHES MAXIMUM IN |
| Thread Length | 1.066 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Seal Accommodation Type | GROOVED |
| Criticality Code Justification | ZZZY |
| Style Designator | THREADED FLANGED |
| Material Document and Classification | ASTM,USN ALLOY S30300,COND A ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Body Inside Diameter | 1.000 INCHES MINIMUM AND 1.003 INCHES MAXIMUM IN |
| Nominal Thread Size | 1.500 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.066 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Material | STEEL COMP 303 SEAT |
| Seat Angle in Deg | 44.000 MINIMUM AND 44.500 MAXIMUM |
| Thread Series Designator | UNEF SINGLE 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 |
|---|---|
| A15688PC13 | 5/1 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| A7736.156(MOD) | 5/1 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| A14319.001.156 | 3/1 Design control — primary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-01-216-8844 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-216-8844: Flange Seat to Disk End Height: 0.375 INCHES NOMINAL IN; Flange Diameter: 1.795 INCHES MINIMUM AND 1.805 INCHES MAXIMUM IN; Thread Length: 1.066 INCHES NOMINAL SINGLE THREADED PORTION IN; Seal Accommodation Type: GROOVED. 16 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 4820-01-216-8844 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.