The Seat,valve, cataloged under National Stock Number 4820-00-091-4261, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Hydro-Aire Aerospace Corp. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-091-4261 |
| Primary Part Number | 21935 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Hydro-Aire Aerospace Corp |
| Status | ACTIVE |
| Seating Surface Shape | FLAT |
| Style Designator | PLAIN FLANGED |
| Flange Diameter | 0.434 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN |
| Material | STEEL OVERALL |
| Material Document and Classification | MIL-S-7420 COND C MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Flange Seat to Disk End Height | 0.065 INCHES NOMINAL IN |
| Body Inside Diameter | 0.187 INCHES NOMINAL IN |
| Under Flange Height | 0.090 INCHES NOMINAL IN |
| Body Outside Diameter | 0.324 INCHES MINIMUM AND 0.326 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 21935 PRIMARY | Hydro-Aire Aerospace Corp (USA) |
NSN 4820-00-091-4261 is a Seat,valve, manufactured by Hydro-Aire Aerospace Corp, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-091-4261 has 1 cross-referenced part number: 21935 (Hydro-Aire Aerospace Corp).
There are 7 known substitutes for 4820-00-091-4261: 5950-00-645-5239, 5306-00-757-0605, 5975-00-869-5537 and 4 more. Verify interchangeability with system specifications before substitution.
Key specifications for 21935: Seating Surface Shape: FLAT; Style Designator: PLAIN FLANGED; Flange Diameter: 0.434 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN; Material: STEEL OVERALL. 9 total characteristics are documented in the Federal Logistics Information System.