The Seat,valve, cataloged under National Stock Number 4820-00-604-4645, 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10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-00-604-4645 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.125 INCHES MINIMUM AND 0.129 INCHES MAXIMUM IN |
| Flange Diameter | 2.723 INCHES MINIMUM AND 2.730 INCHES MAXIMUM IN |
| Body Outside Diameter | 2.496 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | REINFORCED FLUOROCARBON EXTRUSIONS MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 2.250 INCHES MINIMUM AND 2.254 INCHES MAXIMUM IN |
| Under Flange Height | 0.275 INCHES MINIMUM AND 0.279 INCHES MAXIMUM IN |
| Material | PLASTIC FLUOROCARBON OVERALL |
| Seat Angle in Deg | 5.000 NOMINAL |
| 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 |
|---|---|
| P8918A | 3/9 Design control — primary reference Atlas Valve Co |
| SA220D2INPC3 | 5/9 Secondary reference Atlas Valve Co |
NSN 4820-00-604-4645 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-604-4645: Flange Seat to Disk End Height: 0.125 INCHES MINIMUM AND 0.129 INCHES MAXIMUM IN; Flange Diameter: 2.723 INCHES MINIMUM AND 2.730 INCHES MAXIMUM IN; Body Outside Diameter: 2.496 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 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.