The Seat,valve, cataloged under National Stock Number 4820-00-306-6535, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.. Government technical data includes 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-306-6535 |
| Primary Part Number | 144355 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.435 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Flange Diameter | 2.819 INCHES MINIMUM AND 2.820 INCHES MAXIMUM IN |
| Body Outside Diameter | 2.367 INCHES MINIMUM AND 2.371 INCHES MAXIMUM IN |
| Hardness Rating | 90.0 ROCKWELL B MINIMUM AND 105.0 ROCKWELL B MAXIMUM BODY |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | AMS 5700 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Body Inside Diameter | 2.276 INCHES MINIMUM AND 2.286 INCHES MAXIMUM IN |
| Under Flange Height | 0.100 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Material | STEEL BODY |
| Seat Angle in Deg | 45.000 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 |
| Part Number | Manufacturer |
|---|---|
| 144355 PRIMARY | Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. (CAN) |
| Reference | Meaning |
|---|---|
| 144355 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| AS144355 | 5/9 Secondary reference Aircraft Supplies |
NSN 4820-00-306-6535 is a Seat,valve, manufactured by Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-306-6535 has 1 manufacturer part number on file: 144355 (Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-131-6829. Verify interchangeability with system specifications before substitution.
Key specifications for 144355: Flange Seat to Disk End Height: 0.435 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN; Flange Diameter: 2.819 INCHES MINIMUM AND 2.820 INCHES MAXIMUM IN; Body Outside Diameter: 2.367 INCHES MINIMUM AND 2.371 INCHES MAXIMUM IN; Hardness Rating: 90.0 ROCKWELL B MINIMUM AND 105.0 ROCKWELL B MAXIMUM BODY. 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.