The Seat,valve, cataloged under National Stock Number 4820-01-172-0490, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Elliott Company Div Jeannette. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-172-0490 |
| Primary Part Number | 44B3721-277 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Elliott Company Div Jeannette |
| Status | ACTIVE |
| Thread Length | 0.375 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | PLAIN THREADED |
| Body Inside Diameter | 0.825 INCHES NOMINAL IN |
| Nominal Thread Size | 1.500 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF 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 |
|---|---|
| 44B3721-274D PIECE 5C | Elliott Company Div Jeannette (USA) |
| 44B3721-277 PRIMARY | Elliott Company Div Jeannette (USA) |
| Reference | Meaning |
|---|---|
| 44B3721-277 | C/1 Advisory reference — outside the item-of-supply concept Carrier Corp |
NSN 4820-01-172-0490 is a Seat,valve, manufactured by Elliott Company Div Jeannette, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-172-0490 has 2 manufacturer part numbers on file: 44B3721-274D PIECE 5C (Elliott Company Div Jeannette), 44B3721-277 (Elliott Company Div Jeannette).
Key specifications for 44B3721-277: Overall Height: 0.500 INCHES NOMINAL IN; Thread Length: 0.375 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: PLAIN THREADED; Body Inside Diameter: 0.825 INCHES NOMINAL IN. 8 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.