The Seat,valve, cataloged under National Stock Number 4820-00-905-4666, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Scrapper Rings Co Div of Roberts Tool Co. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-905-4666 |
| Primary Part Number | 6-50370-1 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Scrapper Rings Co Div of Roberts Tool Co |
| Status | ACTIVE |
| Body Outside Diameter | 0.500 INCHES NOMINAL IN |
| Body Inside Diameter | 0.260 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6-50370-1 PRIMARY | Scrapper Rings Co Div of Roberts Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 6-50370-1 | 5/9 Secondary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
NSN 4820-00-905-4666 is a Seat,valve, manufactured by Scrapper Rings Co Div of Roberts Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-905-4666 has 1 manufacturer part number on file: 6-50370-1 (Scrapper Rings Co Div of Roberts Tool Co).
Key specifications for 6-50370-1: Body Outside Diameter: 0.500 INCHES NOMINAL IN; Body Inside Diameter: 0.260 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN. 2 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.
NSN 4820-00-905-4666 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.