The Seat,valve, cataloged under National Stock Number 4820-00-659-0660, 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8 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-659-0660 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.046 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN |
| Flange Diameter | 0.498 INCHES MINIMUM AND 0.499 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.377 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.282 INCHES MINIMUM AND 0.284 INCHES MAXIMUM IN |
| Under Flange Height | 0.068 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 213054REVAPC129512-1 | 5/2 Secondary reference U.S. Government activity |
| 129512PC129512-1 | 5/2 Secondary reference U.S. Government activity |
| 213403PC129512-1 | 5/9 Secondary reference U.S. Government activity |
| 9194770-13 | 5/9 Secondary reference Us Army Aviation and Missile Command |
| 215294PC114 | 5/2 Secondary reference U.S. Government activity |
| 515294PC114 | 5/9 Secondary reference U.S. Government activity |
| 129512-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-659-0660 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-659-0660: Flange Seat to Disk End Height: 0.046 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN; Flange Diameter: 0.498 INCHES MINIMUM AND 0.499 INCHES MAXIMUM IN; Body Outside Diameter: 0.377 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 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.