The Seat,valve, cataloged under National Stock Number 4820-00-651-0627, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-651-0627 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Thread Length | 0.516 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Body Stepped Inside Diameter | 0.188 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 0.230 INCHES NOMINAL SECOND STEP IN |
| Body Stepped Inside Diameter | 0.795 INCHES NOMINAL THIRD STEP IN |
| Style Designator | PLAIN THREADED |
| Material Document and Classification | MIL-B-16541 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Size | 1.438 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 14 SINGLE THREADED PORTION |
| Material | COPPER ALLOY OVERALL |
| Seat Angle in Deg | 57.500 NOMINAL |
| Thread Series Designator | UNS SINGLE THREADED PORTION |
| 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 |
|---|---|
| AA39703REVAPC14 | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| AA39703REVAPC14 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| D10815BC | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| D10815BC | 5/9 Secondary reference Hammel Dahl Inc |
| D10815BC | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| AA39703REVAPC14 | 5/9 Secondary reference Hammel Dahl Inc |
NSN 4820-00-651-0627 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-651-0627: Overall Height: 2.625 INCHES NOMINAL IN; Thread Length: 0.516 INCHES NOMINAL SINGLE THREADED PORTION IN; Body Stepped Inside Diameter: 0.188 INCHES NOMINAL FIRST STEP IN; Body Stepped Inside Diameter: 0.230 INCHES NOMINAL SECOND STEP IN. 13 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.