The Disk,valve, cataloged under National Stock Number 4820-01-210-6967, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Nicholson Steam Trap Inc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 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 | 4820-01-210-6967 |
| Primary Part Number | 421487 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Nicholson Steam Trap Inc |
| Status | ACTIVE |
| Shank Diameter | 0.300 INCHES NOMINAL IN |
| Flange Seat to Disk End Height | 0.365 INCHES NOMINAL IN |
| Pressure Rating | 250.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Temp Rating | 170.0 FAHRENHEIT NOMINAL DEGF |
| Style Designator | POPPET |
| Tip Diameter | 0.295 INCHES NOMINAL IN |
| Seat Angle | 60.0 DEGREES NOMINAL |
| Under Flange Height | 0.280 INCHES NOMINAL IN |
| Media for Which Designed | STEAM |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 421487 PRIMARY | Nicholson Steam Trap Inc (USA) |
NSN 4820-01-210-6967 is a Disk,valve, manufactured by Nicholson Steam Trap Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-210-6967 has 1 manufacturer part number on file: 421487 (Nicholson Steam Trap Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5305-01-352-0845, 5999-01-439-8304. Verify interchangeability with system specifications before substitution.
Key specifications for 421487: Shank Diameter: 0.300 INCHES NOMINAL IN; Flange Seat to Disk End Height: 0.365 INCHES NOMINAL IN; Overall Height: 0.845 INCHES NOMINAL IN; Pressure Rating: 250.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS. 10 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.