The Seat,valve, cataloged under National Stock Number 4820-01-118-9377, 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12 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-118-9377 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.062 INCHES NOMINAL IN |
| Flange Diameter | 0.875 INCHES NOMINAL IN |
| Body Outside Diameter | 0.754 INCHES NOMINAL IN |
| Thread Length | 0.310 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.272 INCHES NOMINAL IN |
| Nominal Thread Size | 0.312 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.469 INCHES NOMINAL IN |
| Thread Class | 2B SINGLE THREADED PORTION |
| Material | ALUMINUM ALLOY 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 |
|---|---|
| A16054-1 | 3/9 Design control — primary reference Spx Corporation Dba Dielectric Communications Div Spx Communication Technologies |
| A16054 | D/9 Drawing number reference only Spx Corporation Dba Dielectric Communications Div Spx Communication Technologies |
NSN 4820-01-118-9377 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5340-01-322-1910. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-118-9377: Flange Seat to Disk End Height: 0.062 INCHES NOMINAL IN; Flange Diameter: 0.875 INCHES NOMINAL IN; Body Outside Diameter: 0.754 INCHES NOMINAL IN; Thread Length: 0.310 INCHES NOMINAL SINGLE THREADED PORTION 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.