The Seat,valve, cataloged under National Stock Number 4820-00-992-0630, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Westinghouse Electric Corp. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-992-0630 |
| Primary Part Number | 915D549H01 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Westinghouse Electric Corp |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 1.000 INCHES NOMINAL IN |
| Flange Diameter | 2.460 INCHES MINIMUM AND 2.480 INCHES MAXIMUM IN |
| FSC Application Data | STEAM TURBINE,ELECTRIC GENERATION |
| Thread Length | 0.875 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Body Stepped Inside Diameter | 0.687 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 0.966 INCHES NOMINAL SECOND STEP IN |
| Style Designator | THREADED FLANGED |
| Material Document and Classification | DE15-15B MFR REF SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | STELLITE HAYNES 6 MFR REF SINGLE MATERIAL RESPONSE SEAT |
| Nominal Thread Size | 2.000 INCHES SINGLE THREADED PORTION IN |
| Seat Radius | 0.255 INCHES MINIMUM AND 0.259 INCHES MAXIMUM IN |
| Under Flange Height | 0.875 INCHES NOMINAL IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | STEEL BODY |
| Material | STEEL SEAT |
| Thread Series Designator | UN SINGLE THREADED PORTION |
| Seating Surface Shape | RADIAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 915D549H01 | Westinghouse Electric Corp (USA) |
| 667J658PC9 | Westinghouse Electric Corp (USA) |
| Reference | Meaning |
|---|---|
| 915D549H01 | 3/2 Design control — primary reference U.S. Government activity |
| 915D549H01 | 5/9 Secondary reference U.S. Government activity |
| 915D549PC1 | 5/2 Secondary reference U.S. Government activity |
| 915D549PC1 | 5/9 Secondary reference Westinghouse Electric Corp |
NSN 4820-00-992-0630 is a Seat,valve, manufactured by Westinghouse Electric Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-992-0630 has 2 manufacturer part numbers on file: 915D549H01 (Westinghouse Electric Corp), 667J658PC9 (Westinghouse Electric Corp).
Key specifications for 915D549H01: Flange Seat to Disk End Height: 1.000 INCHES NOMINAL IN; Flange Diameter: 2.460 INCHES MINIMUM AND 2.480 INCHES MAXIMUM IN; FSC Application Data: STEAM TURBINE,ELECTRIC GENERATION; Thread Length: 0.875 INCHES NOMINAL SINGLE THREADED PORTION IN. 18 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.