The Seat,valve, cataloged under National Stock Number 4820-01-145-0987, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Tate Andale, Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-145-0987 |
| Primary Part Number | 16733-2 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Tate Andale, Llc |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 1.000 INCHES NOMINAL IN |
| Flange Diameter | 3.885 INCHES NOMINAL IN |
| Thread Length | 0.188 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 0.500 INCHES NOMINAL IN |
| Nominal Thread Size | 4.000 INCHES SINGLE THREADED PORTION IN |
| Taper Length | 0.125 INCHES NOMINAL IN |
| Seat Radius | 45.750 INCHES NOMINAL IN |
| Under Flange Height | 0.750 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | STEEL OVERALL |
| Thread Series Designator | UN SINGLE THREADED PORTION |
| Seating Surface Shape | RADIAL |
| 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 |
|---|---|
| 499505760023940 | Tate Andale, Llc (USA) |
| 16733-2 PRIMARY | Tate Andale, Llc (USA) |
| Reference | Meaning |
|---|---|
| A-16733-2 | D/9 Drawing number reference only Tate Andale, Llc |
NSN 4820-01-145-0987 is a Seat,valve, manufactured by Tate Andale, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-145-0987 has 2 manufacturer part numbers on file: 499505760023940 (Tate Andale, Llc), 16733-2 (Tate Andale, Llc).
Key specifications for 16733-2: Flange Seat to Disk End Height: 1.000 INCHES NOMINAL IN; Flange Diameter: 3.885 INCHES NOMINAL IN; Thread Length: 0.188 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.