The Seat,valve, cataloged under National Stock Number 4820-01-161-2547, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-161-2547 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.130 INCHES NOMINAL IN |
| Flange Diameter | 1.000 INCHES NOMINAL IN |
| Thread Length | 0.188 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Body Stepped Inside Diameter | 0.125 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 0.500 INCHES NOMINAL SECOND STEP IN |
| Style Designator | THREADED FLANGED |
| Nominal Thread Size | 0.875 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.305 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF 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 |
|---|---|
| 48997 | 5/9 Secondary reference U.S. Government activity |
| 48997B | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-161-2547 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5330-01-368-6358, 5930-01-450-5600. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-161-2547: Flange Seat to Disk End Height: 0.130 INCHES NOMINAL IN; Flange Diameter: 1.000 INCHES NOMINAL IN; Thread Length: 0.188 INCHES NOMINAL SINGLE THREADED PORTION IN; Body Stepped Inside Diameter: 0.125 INCHES NOMINAL FIRST STEP IN. 12 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.