The Seat,valve, cataloged under National Stock Number 4820-01-131-3709, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Metrex Valve Corp. Dba Metrex Valve Corp. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-131-3709 |
| Primary Part Number | 29M112 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Metrex Valve Corp. Dba Metrex Valve Corp |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.405 INCHES NOMINAL IN |
| Flange Diameter | 1.755 INCHES NOMINAL IN |
| Thread Length | 0.300 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Taper Minor Diameter | 0.625 INCHES NOMINAL IN |
| Style Designator | THREADED FLANGED |
| Taper Major Diameter | 1.250 INCHES NOMINAL IN |
| Body Inside Diameter | 0.625 INCHES NOMINAL IN |
| Nominal Thread Size | 1.625 INCHES SINGLE THREADED PORTION IN |
| Taper Length | 0.562 INCHES NOMINAL IN |
| Seat Radius | 0.062 INCHES NOMINAL IN |
| Under Flange Height | 0.395 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY 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 |
|---|---|
| 29M112 PRIMARY | Metrex Valve Corp. Dba Metrex Valve Corp (USA) |
| Reference | Meaning |
|---|---|
| NHPC-11080 | D/9 Drawing number reference only Metrex Valve Corp. Dba Metrex Valve Corp |
| NHPC-11080 P/N 34 | 5/9 Secondary reference Metrex Valve Corp. Dba Metrex Valve Corp |
NSN 4820-01-131-3709 is a Seat,valve, manufactured by Metrex Valve Corp. Dba Metrex Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-131-3709 has 1 manufacturer part number on file: 29M112 (Metrex Valve Corp. Dba Metrex Valve Corp).
Key specifications for 29M112: Flange Seat to Disk End Height: 0.405 INCHES NOMINAL IN; Flange Diameter: 1.755 INCHES NOMINAL IN; Thread Length: 0.300 INCHES NOMINAL SINGLE THREADED PORTION IN; Taper Minor Diameter: 0.625 INCHES NOMINAL IN. 16 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.