The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-00-028-7034, 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 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-028-7034 |
| Primary Part Number | U6251DITEM1 |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Outside Diameter | 5.000 INCHES NOMINAL IN |
| Style Designator | SPECIAL SHAPED |
| Material Thickness | 0.172 INCHES NOMINAL IN |
| Material | RUBBER |
| 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 |
|---|---|
| U6251DITEM1 PRIMARY | Ashcroft Inc Dba Heise (USA) |
| R6309XPC21-83713 PRIMARY | Ashcroft Inc Dba Heise (USA) |
| 83713 PRIMARY | Ashcroft Inc Dba Heise (USA) |
| Reference | Meaning |
|---|---|
| 83713 | C/1 Advisory reference — outside the item-of-supply concept Komdresco Canada Inc |
| 5119-4824-3816PC21-83713 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-028-7034 is a Diaphragm,actuator Valve,special, manufactured by Ashcroft Inc Dba Heise, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-028-7034 has 3 manufacturer part numbers on file: U6251DITEM1 (Ashcroft Inc Dba Heise), R6309XPC21-83713 (Ashcroft Inc Dba Heise), 83713 (Ashcroft Inc Dba Heise).
Key specifications for U6251DITEM1: Overall Height: 3.000 INCHES NOMINAL IN; Outside Diameter: 5.000 INCHES NOMINAL IN; Style Designator: SPECIAL SHAPED; Material Thickness: 0.172 INCHES NOMINAL IN. 4 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.