The Seat,valve, cataloged under National Stock Number 4820-00-825-1998, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Div Epd. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 14 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-825-1998 |
| Primary Part Number | 186311PC100 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.313 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN |
| Flange Diameter | 4.355 INCHES MINIMUM AND 4.370 INCHES MAXIMUM IN |
| Body Outside Diameter | 3.918 INCHES MINIMUM AND 3.933 INCHES MAXIMUM IN |
| Thread Length | 0.625 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 0.750 INCHES NOMINAL IN |
| Nominal Thread Size | 0.750 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.375 INCHES NOMINAL IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) 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 |
| Part Number | Manufacturer |
|---|---|
| 186290PC100 | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA) |
| 186311PC100 | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA) |
| 184450PC100 | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA) |
| CMK36K5N | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| 186311PC100 PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| CMK36K5N | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| 186311PC100 | 5/9 Secondary reference Ingersoll Rand Co |
| 186290PC100 | 5/9 Secondary reference Ingersoll Rand Co |
| 186311PC100 | 5/9 Secondary reference U.S. Government activity |
| 186311PC100 | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
| 184450PC100 | 5/9 Secondary reference Ingersoll Rand Co |
| 186311PC100 | 3/9 Design control — primary reference U.S. Government activity |
| 186290PC100 | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
| CMK36K5N | 5/9 Secondary reference U.S. Government activity |
| CMK36K5N | 5/9 Secondary reference U.S. Government activity |
| CMK36K5N | 5/9 Secondary reference Ingersoll Rand Co |
| 184450PC100 | 5/9 Secondary reference U.S. Government activity |
| 186290PC100 | 5/9 Secondary reference U.S. Government activity |
| CMK36K5N | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
| 184450PC100 | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
NSN 4820-00-825-1998 is a Seat,valve, manufactured by Curtiss-Wright Electro-Mechanical Corporation Div Epd, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-825-1998 has 6 manufacturer part numbers on file: 186290PC100 (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions), 186311PC100 (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions), 184450PC100 (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions), CMK36K5N (Curtiss-Wright Electro-Mechanical Corporation Div Epd), 186311PC100 (Curtiss-Wright Electro-Mechanical Corporation Div Epd) and 1 more.
Key specifications for 186311PC100: Flange Seat to Disk End Height: 0.313 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN; Flange Diameter: 4.355 INCHES MINIMUM AND 4.370 INCHES MAXIMUM IN; Body Outside Diameter: 3.918 INCHES MINIMUM AND 3.933 INCHES MAXIMUM IN; Thread Length: 0.625 INCHES NOMINAL SINGLE THREADED PORTION IN. 13 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.