The Seat,valve, cataloged under National Stock Number 4820-00-629-9897, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ashcroft Inc Dba Heise. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-629-9897 |
| Primary Part Number | 89599 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Thread Length | 1.250 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Hardness Rating | 22.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM BODY |
| Hardness Rating | 22.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM FACE |
| Style Designator | PLAIN THREADED |
| Body Inside Diameter | 1.875 INCHES NOMINAL IN |
| Nominal Thread Size | 3.031 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 18 SINGLE THREADED PORTION |
| Material | STEEL COMP 414 OVERALL |
| Thread Series Designator | UNS SINGLE THREADED PORTION |
| 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 | X |
NSN 4820-00-629-9897 is a Seat,valve, manufactured by Ashcroft Inc Dba Heise, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-629-9897 has 2 manufacturer part numbers on file: 89599 (Ashcroft Inc Dba Heise), 5VQS72PC4 (Ashcroft Inc Dba Heise).
Key specifications for 89599: Overall Height: 1.875 INCHES NOMINAL IN; Thread Length: 1.250 INCHES NOMINAL SINGLE THREADED PORTION IN; Hardness Rating: 22.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM BODY; Hardness Rating: 22.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM FACE. 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.