The Seat,valve, cataloged under National Stock Number 4820-00-255-5809, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Shipham Valves Limited. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-255-5809 |
| Primary Part Number | M11718ITEM4 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Shipham Valves Limited |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.125 INCHES NOMINAL IN |
| Flange Diameter | 2.625 INCHES NOMINAL IN |
| Thread Length | 0.312 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Material Document and Classification | MONEL BS3071NA13 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 2.000 INCHES NOMINAL IN |
| Nominal Thread Size | 2.375 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.312 INCHES NOMINAL IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 16 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY OVERALL |
| Thread Series Designator | UN 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 |
|---|---|
| M10987/2 | Shipham Valves Limited (GBR) |
| M11718IM4 | Shipham Valves Limited (GBR) |
| M11718ITEM4 PRIMARY | Shipham Valves Limited (GBR) |
NSN 4820-00-255-5809 is a Seat,valve, manufactured by Shipham Valves Limited, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-255-5809 has 3 manufacturer part numbers on file: M10987/2 (Shipham Valves Limited), M11718IM4 (Shipham Valves Limited), M11718ITEM4 (Shipham Valves Limited).
Key specifications for M11718ITEM4: Flange Seat to Disk End Height: 0.125 INCHES NOMINAL IN; Flange Diameter: 2.625 INCHES NOMINAL IN; Thread Length: 0.312 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 13 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.