The Flange,pipe, cataloged under National Stock Number 4730-00-640-6989, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-640-6989 |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Socket Diameter | 4.500 INCHES NOMINAL IN |
| Flange Diameter | 7.688 INCHES NOMINAL IN |
| Face Seating Surface Condition | MACHINED |
| Socket Depth | 0.688 INCHES NOMINAL IN |
| Maximum Operating Temp and Media for Which Designed | 425.0 FAHRENHEIT GAS AND 425.0 FAHRENHEIT OIL AND 425.0 FAHRENHEIT STEAM AND 425.0 FAHRENHEIT WATER DEGF |
| Tube Outside Diameter for Which Designed | 4.500 INCHES NOMINAL IN |
| Operating Pressure and Type | 150.0 POUNDS PER SQUARE INCH (PSI) GAS MAXIMUM REQUIRED AND 150.0 POUNDS PER SQUARE INCH (PSI) OIL MAXIMUM REQUIRED AND 150.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 150.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS |
| Flange Section Style | PLAIN FACE, SOCKET NECK |
| Style Designator | ROUND, ONE BOLT HOLE CIRCLE |
| Bolt Hole Diameter | 0.562 INCHES NOMINAL IN |
| Neck Height | 0.938 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | EF TYPE |
| Bolt Hole Quantity | 8 |
| Bolt Circle Diameter | 6.562 INCHES NOMINAL IN |
| Material | COPPER ALLOY |
| Thickness | 0.500 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MILF20042PLAIN100LBCLASSTYPEEF | 4/1 Identification reference U.S. Government activity |
NSN 4730-00-640-6989 is a Flange,pipe, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4730-00-640-6991. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-640-6989: Socket Diameter: 4.500 INCHES NOMINAL IN; Flange Diameter: 7.688 INCHES NOMINAL IN; Face Seating Surface Condition: MACHINED; Socket Depth: 0.688 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.