The Seat,valve, cataloged under National Stock Number 4820-00-933-0754, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-933-0754 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.176 INCHES MINIMUM AND 0.178 INCHES MAXIMUM IN |
| Flange Diameter | 0.748 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.632 INCHES MINIMUM AND 0.633 INCHES MAXIMUM IN |
| Body Stepped Inside Diameter | 0.372 INCHES NOMINAL SECOND STEP IN |
| Body Stepped Inside Diameter | 0.375 INCHES NOMINAL FIRST STEP IN |
| Style Designator | PLAIN FLANGED |
| Under Flange Height | 0.185 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| 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 |
| Reference | Meaning |
|---|---|
| 281539-0001 ITEM NO. 15 | 5/2 Secondary reference U.S. Government activity |
| 180324 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-933-0754 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4810-01-051-1942. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-933-0754: Flange Seat to Disk End Height: 0.176 INCHES MINIMUM AND 0.178 INCHES MAXIMUM IN; Flange Diameter: 0.748 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN; Body Outside Diameter: 0.632 INCHES MINIMUM AND 0.633 INCHES MAXIMUM IN; Body Stepped Inside Diameter: 0.372 INCHES NOMINAL SECOND STEP 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.