The Seat,valve, cataloged under National Stock Number 4820-01-217-0016, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-217-0016 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.690 INCHES NOMINAL IN |
| Flange Diameter | 3.880 INCHES NOMINAL IN |
| Thread Length | 0.710 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Seal Accommodation Type | RECESSED |
| Style Designator | THREADED FLANGED |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 2.625 INCHES NOMINAL IN |
| Nominal Thread Size | 3.459 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.710 INCHES NOMINAL IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 11-1/2 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY OVERALL |
| Seat Angle in Deg | 30.000 NOMINAL |
| Thread Series Designator | UNS 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 |
|---|---|
| 845-2445066 | D/9 Drawing number reference only U.S. Government activity |
| 26M77-100 | D/9 Drawing number reference only U.S. Government activity |
| 26M77-100 ITEM 17 | 3/2 Design control — primary reference U.S. Government activity |
| 845-2445066 ITEM 17 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-217-0016 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-217-0016: Flange Seat to Disk End Height: 0.690 INCHES NOMINAL IN; Flange Diameter: 3.880 INCHES NOMINAL IN; Thread Length: 0.710 INCHES NOMINAL SINGLE THREADED PORTION IN; Seal Accommodation Type: RECESSED. 15 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.