The Seat,valve, cataloged under National Stock Number 4820-00-346-6529, 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 14 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-346-6529 |
| Primary Part Number | 8037A06B |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.438 INCHES NOMINAL IN |
| Flange Diameter | 2.188 INCHES NOMINAL IN |
| Thread Length | 0.438 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Body Stepped Inside Diameter | 1.436 INCHES MINIMUM AND 1.440 INCHES MAXIMUM THIRD STEP IN |
| Body Stepped Inside Diameter | 1.558 INCHES MINIMUM AND 1.568 INCHES MAXIMUM SECOND STEP IN |
| Body Stepped Inside Diameter | 1.695 INCHES MINIMUM AND 1.697 INCHES MAXIMUM FIRST STEP IN |
| Style Designator | THREADED FLANGED |
| Nominal Thread Size | 2.000 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.438 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 16 SINGLE THREADED PORTION |
| Material | COBALT ALLOY OVERALL |
| Thread Series Designator | UN 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 |
| Part Number | Manufacturer |
|---|---|
| 8037A06B PRIMARY | Ashcroft Inc Dba Heise (USA) |
| H4820-346-6529 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| R557-49090APC16 | 5/9 Secondary reference Ashcroft Inc Dba Heise |
| R557-49340CPC16 | 5/9 Secondary reference Ashcroft Inc Dba Heise |
| R557-49330APC16 | 5/9 Secondary reference Ashcroft Inc Dba Heise |
| R557-49120APC16 | 5/9 Secondary reference Ashcroft Inc Dba Heise |
NSN 4820-00-346-6529 is a Seat,valve, manufactured by Ashcroft Inc Dba Heise, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-346-6529 has 2 manufacturer part numbers on file: 8037A06B (Ashcroft Inc Dba Heise), H4820-346-6529 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 8037A06B: Flange Seat to Disk End Height: 0.438 INCHES NOMINAL IN; Flange Diameter: 2.188 INCHES NOMINAL IN; Thread Length: 0.438 INCHES NOMINAL SINGLE THREADED PORTION IN; Body Stepped Inside Diameter: 1.436 INCHES MINIMUM AND 1.440 INCHES MAXIMUM THIRD STEP IN. 14 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.