The Seat,valve, cataloged under National Stock Number 4820-00-756-4985, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Tactair Fluid Controls Inc. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-756-4985 |
| Primary Part Number | C5606-21 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Tactair Fluid Controls Inc |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.063 INCHES NOMINAL IN |
| Flange Diameter | 0.358 INCHES NOMINAL IN |
| Body Outside Diameter | 0.248 INCHES NOMINAL IN |
| Seal Accommodation Type | GROOVED |
| Hardness Rating | 57.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.049 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Under Flange Height | 0.207 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Seat Angle in Deg | 39.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| C5606-21 PRIMARY | Tactair Fluid Controls Inc (USA) |
| Reference | Meaning |
|---|---|
| C5606-21 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-756-4985 is a Seat,valve, manufactured by Tactair Fluid Controls Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-756-4985 has 1 manufacturer part number on file: C5606-21 (Tactair Fluid Controls Inc).
Key specifications for C5606-21: Flange Seat to Disk End Height: 0.063 INCHES NOMINAL IN; Flange Diameter: 0.358 INCHES NOMINAL IN; Body Outside Diameter: 0.248 INCHES NOMINAL IN; Seal Accommodation Type: GROOVED. 12 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.
NSN 4820-00-756-4985 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.