The Disk,valve, cataloged under National Stock Number 4820-00-028-7175, 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 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-028-7175 |
| Primary Part Number | 85504 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Shoulder Width | 1.525 INCHES NOMINAL IN |
| Shoulder Height | 0.500 INCHES NOMINAL IN |
| Outside Diameter | 3.010 INCHES NOMINAL IN |
| Style Designator | PLUG |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Nominal Thread Size | 1.375 INCHES IN |
| Thread Class | 2B |
| Material | NICKEL ALLOY |
| Thread Series Designator | UNEF |
| 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 |
|---|---|
| 85504 PRIMARY | Ashcroft Inc Dba Heise (USA) |
| R6309XPC3-85504 PRIMARY | Ashcroft Inc Dba Heise (USA) |
| Reference | Meaning |
|---|---|
| 5119-4824-3816PC3-85504 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-028-7175 is a Disk,valve, manufactured by Ashcroft Inc Dba Heise, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-028-7175 has 2 manufacturer part numbers on file: 85504 (Ashcroft Inc Dba Heise), R6309XPC3-85504 (Ashcroft Inc Dba Heise).
5 possible matches (shared part number, not a government interchangeability claim): 4930-00-906-0608, 5962-01-265-8182, 5331-01-268-0871. Verify interchangeability with system specifications before substitution.
Key specifications for 85504: Overall Height: 3.175 INCHES NOMINAL IN; Shoulder Width: 1.525 INCHES NOMINAL IN; Shoulder Height: 0.500 INCHES NOMINAL IN; Outside Diameter: 3.010 INCHES NOMINAL IN. 9 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.