The Seat,valve, cataloged under National Stock Number 4820-01-110-0145, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-110-0145 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.181 INCHES NOMINAL IN |
| Flange Diameter | 0.990 INCHES NOMINAL IN |
| Body Outside Diameter | 0.923 INCHES NOMINAL IN |
| Body Stepped Inside Diameter | 0.375 INCHES NOMINAL SECOND STEP IN |
| Body Stepped Inside Diameter | 0.429 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 0.677 INCHES NOMINAL THIRD STEP IN |
| Style Designator | PLAIN FLANGED |
| Under Flange Height | 0.429 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| 281756-0002 | D/9 Drawing number reference only U.S. Government activity |
| 189991 | 5/9 Secondary reference U.S. Government activity |
| 190310-0030 | 3/2 Design control — primary reference U.S. Government activity |
| 281756-0002 ITEM 16 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-110-0145 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5340-01-122-4374, 5310-01-513-2322. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-110-0145: Flange Seat to Disk End Height: 0.181 INCHES NOMINAL IN; Flange Diameter: 0.990 INCHES NOMINAL IN; Body Outside Diameter: 0.923 INCHES NOMINAL IN; Body Stepped Inside Diameter: 0.375 INCHES NOMINAL SECOND STEP IN. 11 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.