The Seat,valve, cataloged under National Stock Number 4820-00-075-0373, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Leslie Controls, Inc. Dba Leslie Controls Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-075-0373 |
| Primary Part Number | N491200057 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Leslie Controls, Inc. Dba Leslie Controls Inc |
| Status | ACTIVE |
| Thread Length | 0.281 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | PLAIN THREADED |
| Body Inside Diameter | 0.188 INCHES NOMINAL IN |
| Nominal Thread Size | 1.180 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 14 SINGLE THREADED PORTION |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| N491200057 PRIMARY | Leslie Controls, Inc. Dba Leslie Controls Inc (USA) |
| 49120 | Lineta Engineering Und Handelsgesell-Schaft Mbh (DEU) |
| Reference | Meaning |
|---|---|
| 49120-0057 | 5/9 Secondary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
| 49120 | 5/9 Secondary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
NSN 4820-00-075-0373 is a Seat,valve, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-075-0373 has 2 manufacturer part numbers on file: N491200057 (Leslie Controls, Inc. Dba Leslie Controls Inc), 49120 (Lineta Engineering Und Handelsgesell-Schaft Mbh).
2 possible matches (shared part number, not a government interchangeability claim): 5340-01-559-4059, 4140-01-651-9191. Verify interchangeability with system specifications before substitution.
Key specifications for N491200057: Overall Height: 1.094 INCHES NOMINAL IN; Thread Length: 0.281 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: PLAIN THREADED; Body Inside Diameter: 0.188 INCHES NOMINAL IN. 9 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.