The Seat,valve, cataloged under National Stock Number 4820-00-074-5220, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Babcock & Wilcox Co. Government technical data includes 12 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-074-5220 |
| Primary Part Number | 7803921 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Babcock & Wilcox Co |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.250 INCHES NOMINAL IN |
| Flange Diameter | 2.656 INCHES NOMINAL IN |
| Thread Length | 0.531 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | FAUCET |
| Material Document and Classification | STAINLESS FORGING 410 MFR REF SINGLE MATERIAL RESPONSE BODY |
| Body Inside Diameter | 1.375 INCHES MINIMUM AND 2.094 INCHES MAXIMUM IN |
| Nominal Thread Size | 2.500 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.781 INCHES NOMINAL IN |
| Thread Quantity Per Inch | 16 SINGLE THREADED PORTION |
| Material | STEEL BODY |
| 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 |
|---|---|
| 301125-1125 | Babcock & Wilcox Co (USA) |
| 7803921 PRIMARY | Babcock & Wilcox Co (USA) |
| Reference | Meaning |
|---|---|
| 301125-1125 | C/1 Advisory reference — outside the item-of-supply concept Diamond Power International, Inc. |
| 301125-1125 | 5/9 Secondary reference The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company |
| FM-2262 | 5/9 Secondary reference Diamond Power International, Inc. |
| 7803921 | 5/9 Secondary reference The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company |
| FM7521D | 5/9 Secondary reference Diamond Electronics Inc |
| 301125-1125 | 5/9 Secondary reference Diamond Electronics Inc |
NSN 4820-00-074-5220 is a Seat,valve, manufactured by Babcock & Wilcox Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-074-5220 has 2 manufacturer part numbers on file: 301125-1125 (Babcock & Wilcox Co), 7803921 (Babcock & Wilcox Co).
Key specifications for 7803921: Flange Seat to Disk End Height: 0.250 INCHES NOMINAL IN; Flange Diameter: 2.656 INCHES NOMINAL IN; Thread Length: 0.531 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: FAUCET. 12 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.