The Seat,valve, cataloged under National Stock Number 4820-01-127-5149, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hunt Valve Company, Inc.. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-127-5149 |
| Primary Part Number | D21001M |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.375 INCHES NOMINAL IN |
| Flange Diameter | 1.750 INCHES NOMINAL IN |
| Thread Length | 0.219 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 1.000 INCHES NOMINAL IN |
| Nominal Thread Size | 1.500 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.375 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 14 SINGLE THREADED PORTION |
| Material | COPPER ALLOY 482 OVERALL |
| Thread Series Designator | UNS 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 |
| Part Number | Manufacturer |
|---|---|
| D21001M PRIMARY | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3245253 PIECE7 | 5/2 Secondary reference U.S. Government activity |
| D21001M | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| AA38679 | D/9 Drawing number reference only Hammel Dahl Inc |
| D21001MBF | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company Inc Dba Union Flonetics |
| 3245253 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-127-5149 is a Seat,valve, manufactured by Hunt Valve Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-127-5149 has 1 manufacturer part number on file: D21001M (Hunt Valve Company, Inc.).
Key specifications for D21001M: Flange Seat to Disk End Height: 0.375 INCHES NOMINAL IN; Flange Diameter: 1.750 INCHES NOMINAL IN; Thread Length: 0.219 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 12 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.