The Seat,valve, cataloged under National Stock Number 4820-00-866-6876, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-866-6876 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.020 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN |
| Flange Diameter | 1.390 INCHES MINIMUM AND 1.410 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.917 INCHES MINIMUM AND 0.922 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C NOMINAL OVERALL |
| Material Document and Classification | AMS 5610 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Body Inside Diameter | 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN |
| Under Flange Height | 0.090 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN |
| Material | STEEL OVERALL |
| Seat Angle in Deg | 14.000 MINIMUM AND 16.000 MAXIMUM |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| 2484154 | 3/2 Design control — primary reference U.S. Government activity |
| 2481050 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-00-866-6876 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-866-6876: Flange Seat to Disk End Height: 0.020 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN; Flange Diameter: 1.390 INCHES MINIMUM AND 1.410 INCHES MAXIMUM IN; Body Outside Diameter: 0.917 INCHES MINIMUM AND 0.922 INCHES MAXIMUM IN; Hardness Rating: 36.0 ROCKWELL C NOMINAL OVERALL. 10 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.