The Seat,valve, cataloged under National Stock Number 4820-00-979-6366, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hamilton Sundstrand Corporation Dba Collins Aerospace. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-979-6366 |
| Primary Part Number | 577910 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hamilton Sundstrand Corporation Dba Collins Aerospace |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN |
| Flange Diameter | 0.855 INCHES MINIMUM AND 0.865 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.621 INCHES MINIMUM AND 0.623 INCHES MAXIMUM IN |
| Seal Accommodation Type | GROOVED |
| Hardness Rating | 75.0 ROCKWELL R MINIMUM AND 15.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.398 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Under Flange Height | 0.310 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN |
| Material | STEEL CORROSION RESISTING 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 | F |
NSN 4820-00-979-6366 is a Seat,valve, manufactured by Hamilton Sundstrand Corporation Dba Collins Aerospace, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-979-6366 has 2 manufacturer part numbers on file: 577910 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us), 577910 (Hamilton Sundstrand Corporation Dba Collins Aerospace).
1 possible match (shared part number, not a government interchangeability claim): 5985-01-055-4063. Verify interchangeability with system specifications before substitution.
Key specifications for 577910: Flange Seat to Disk End Height: 0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN; Flange Diameter: 0.855 INCHES MINIMUM AND 0.865 INCHES MAXIMUM IN; Body Outside Diameter: 0.621 INCHES MINIMUM AND 0.623 INCHES MAXIMUM IN; Seal Accommodation Type: GROOVED. 11 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.