The Seat,valve, cataloged under National Stock Number 4820-00-028-7176, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-028-7176 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Thread Length | 0.628 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | PLAIN THREADED |
| Nominal Thread Size | 4.000 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 18 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY OVERALL |
| Thread Series Designator | UNS 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 |
|---|---|
| 85513 | 5/9 Secondary reference Ashcroft Inc Dba Heise |
| 0085513 | 3/9 Design control — primary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
| R6309XPCA85513 | 5/9 Secondary reference Ashcroft Inc Dba Heise |
| 5119-4824-3816PCA85513 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-028-7176 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 4820-00-142-2122, 5360-00-654-4453, 4730-01-173-0984. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-028-7176: Thread Length: 0.628 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: PLAIN THREADED; Nominal Thread Size: 4.000 INCHES SINGLE THREADED PORTION IN; Special Features: WRENCHING FACILITY INTERNAL LUGS. 8 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.