The Seat,valve, cataloged under National Stock Number 4820-01-128-5704, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-128-5704 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Thread Length | 0.094 INCHES NOMINAL THIRD THREADED PORTION IN |
| Thread Length | 0.219 INCHES NOMINAL SECOND THREADED PORTION IN |
| Thread Length | 0.750 INCHES NOMINAL FIRST THREADED PORTION IN |
| Body Stepped Inside Diameter | 0.685 INCHES NOMINAL SECOND STEP IN |
| Body Stepped Inside Diameter | 0.752 INCHES NOMINAL FIRST STEP IN |
| Style Designator | DOUBLE FLANGED |
| Nominal Thread Size | 0.750 INCHES FIRST THREADED PORTION IN |
| Nominal Thread Size | 1.000 INCHES SECOND THREADED PORTION IN |
| Nominal Thread Size | 1.375 INCHES THIRD THREADED PORTION IN |
| Thread Class | 2A SECOND THREADED PORTION A |
| Thread Class | 2A THIRD THREADED PORTION A |
| Thread Quantity Per Inch | 14 FIRST THREADED PORTION |
| Thread Quantity Per Inch | 20 SECOND THREADED PORTION |
| Thread Quantity Per Inch | 20 THIRD THREADED PORTION |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | UNEF SECOND THREADED PORTION |
| Thread Series Designator | NPT FIRST THREADED PORTION |
| Thread Series Designator | UN THIRD 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 |
|---|---|
| 0076807 | 3/9 Design control — primary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
NSN 4820-01-128-5704 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-128-5704: Overall Height: 2.058 INCHES NOMINAL IN; Thread Length: 0.094 INCHES NOMINAL THIRD THREADED PORTION IN; Thread Length: 0.219 INCHES NOMINAL SECOND THREADED PORTION IN; Thread Length: 0.750 INCHES NOMINAL FIRST THREADED PORTION IN. 19 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.