The Seat,valve, cataloged under National Stock Number 4820-00-393-4334, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Ashcroft Inc Dba Heise. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-393-4334 |
| Primary Part Number | 20617 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.798 INCHES NOMINAL IN |
| Body Inside Diameter | 2.625 INCHES NOMINAL IN |
| Thread Series Designator | UNS SINGLE THREADED PORTION |
| Style Designator | THREADED FLANGED |
| Flange Diameter | 3.245 INCHES NOMINAL IN |
| Seat Angle in Deg | 45.000 NOMINAL |
| Material | COPPER ALLOY OVERALL |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Seating Surface Shape | ANGULAR |
| Under Flange Height | 0.880 INCHES NOMINAL IN |
| Nominal Thread Size | 2.875 INCHES SINGLE THREADED PORTION IN |
| Thread Length | 0.612 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Thread Quantity Per Inch | 18 SINGLE THREADED PORTION |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 20617 PRIMARY | Ashcroft Inc Dba Heise (USA) |
| 17592 PRIMARY | Ashcroft Inc Dba Heise (USA) |
| R6180ZPC1A PRIMARY | Ashcroft Inc Dba Heise (USA) |
NSN 4820-00-393-4334 is a Seat,valve, manufactured by Ashcroft Inc Dba Heise, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-393-4334 has 3 cross-referenced part numbers: 20617 (Ashcroft Inc Dba Heise), 17592 (Ashcroft Inc Dba Heise), R6180ZPC1A (Ashcroft Inc Dba Heise).
There are 8 known substitutes for 4820-00-393-4334: 5355-00-093-6650, 5330-00-256-6987, 5962-00-365-5728 and 5 more. Verify interchangeability with system specifications before substitution.
Key specifications for 20617: Flange Seat to Disk End Height: 0.798 INCHES NOMINAL IN; Body Inside Diameter: 2.625 INCHES NOMINAL IN; Thread Series Designator: UNS SINGLE THREADED PORTION; Style Designator: THREADED FLANGED. 13 total characteristics are documented in the Federal Logistics Information System.