The Seat,valve, cataloged under National Stock Number 4820-01-455-7551, 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 14 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-455-7551 |
| Primary Part Number | N323870058 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Leslie Controls, Inc. Dba Leslie Controls Inc |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.437 INCHES NOMINAL IN |
| Flange Diameter | 5.812 INCHES NOMINAL IN |
| Thread Length | 0.688 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Material Document and Classification | ASTM A-182 GR F ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 4.625 INCHES NOMINAL IN |
| Nominal Thread Size | 5.500 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.688 INCHES NOMINAL IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 14 SINGLE THREADED PORTION |
| Material | STEEL COMP 316 OVERALL |
| Seat Angle in Deg | 45.000 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 |
| Part Number | Manufacturer |
|---|---|
| 18337N PC 34 | Leslie Controls, Inc. Dba Leslie Controls Inc (USA) |
| N323870058 PRIMARY | Leslie Controls, Inc. Dba Leslie Controls Inc (USA) |
| Reference | Meaning |
|---|---|
| 18337N | D/9 Drawing number reference only Leslie Controls, Inc. Dba Leslie Controls Inc |
| 32387 | 5/9 Secondary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
| 323870058 | 3/9 Design control — primary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
NSN 4820-01-455-7551 is a Seat,valve, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-455-7551 has 2 manufacturer part numbers on file: 18337N PC 34 (Leslie Controls, Inc. Dba Leslie Controls Inc), N323870058 (Leslie Controls, Inc. Dba Leslie Controls Inc).
Key specifications for N323870058: Flange Seat to Disk End Height: 0.437 INCHES NOMINAL IN; Flange Diameter: 5.812 INCHES NOMINAL IN; Thread Length: 0.688 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 14 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.