The Seat,valve, cataloged under National Stock Number 4820-01-273-3333, 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10 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-273-3333 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Thread Length | 0.350 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Seal Accommodation Type | RECESSED |
| Style Designator | PLAIN THREADED |
| Body Inside Diameter | 0.922 INCHES MINIMUM IN |
| Nominal Thread Size | 1.875 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 8 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY OR COPPER ALLOY OVERALL |
| 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 |
| Reference | Meaning |
|---|---|
| 202501225 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| 202501225 | 3/9 Design control — primary reference Pima Valve, Llc |
| ASI-B122A-L/S-2.5 ITEM 6 | 5/9 Secondary reference Pima Valve, Llc |
| ASI-B122A-L/S-2.5 ITEM 6 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
NSN 4820-01-273-3333 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-273-3333: Overall Height: 0.395 INCHES NOMINAL IN; Thread Length: 0.350 INCHES NOMINAL SINGLE THREADED PORTION IN; Seal Accommodation Type: RECESSED; Style Designator: PLAIN THREADED. 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.