The Seat,valve, cataloged under National Stock Number 4820-00-901-1048, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-901-1048 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.073 INCHES MINIMUM AND 0.077 INCHES MAXIMUM IN |
| Flange Diameter | 0.747 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.688 INCHES MINIMUM AND 0.689 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | MIL-M-20693 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 0.375 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN |
| Under Flange Height | 0.037 INCHES MINIMUM AND 0.039 INCHES MAXIMUM IN |
| Material | FABRIC, NYLON OVERALL |
| Seat Angle in Deg | 30.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 280694PC13 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 173152 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-901-1048 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-145-7872. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-901-1048: Flange Seat to Disk End Height: 0.073 INCHES MINIMUM AND 0.077 INCHES MAXIMUM IN; Flange Diameter: 0.747 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN; Body Outside Diameter: 0.688 INCHES MINIMUM AND 0.689 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 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.