The Flange,pipe, cataloged under National Stock Number 4730-01-329-2473, 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 18 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 9 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-329-2473 |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Socket Diameter | 1.360 INCHES NOMINAL IN |
| Flange Diameter | 4.250 INCHES NOMINAL IN |
| Face Seating Surface Condition | MACHINED |
| Nominal Pipe Size for Which Designed | 1.000 INCHES IN |
| Socket Depth | 0.500 INCHES NOMINAL IN |
| Flange Section Style | RAISED FACE, SOCKET NECK |
| Style Designator | ROUND, ONE BOLT HOLE CIRCLE |
| Bolt Hole Diameter | 0.625 INCHES NOMINAL IN |
| Neck Height | 0.062 INCHES NOMINAL IN |
| Material Document and Classification | A182 ASSN STD SINGLE MATERIAL RESPONSE OR A240 ASSN STD SINGLE MATERIAL RESPONSE |
| Specification/standard Data | 81349-MIL-F-18180/2A GOVERNMENT SPECIFICATION A |
| Nondefinitive Spec/std Data | A TYPE |
| Bolt Hole Quantity | 4 |
| Bolt Circle Diameter | 3.125 INCHES NOMINAL IN |
| Raised Face Diameter | 2.000 INCHES NOMINAL IN |
| Raised Face Height | 0.062 INCHES NOMINAL IN |
| Material | STEEL COMP 304 |
| 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 |
|---|---|
| ASME 16.5 | 3/1 Design control — primary reference U.S. Government activity |
| MIL-F-18180/2A | 5/9 Secondary reference U.S. Government activity |
| M18180/2-03A23 | 5/9 Secondary reference U.S. Government activity |
| M18180/2-03A23 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4730-01-329-2473 is a Flange,pipe, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
9 possible matches (shared part number, not a government interchangeability claim): 4730-01-329-2474, 4730-01-329-3508, 4730-01-329-3509. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-329-2473: Socket Diameter: 1.360 INCHES NOMINAL IN; Flange Diameter: 4.250 INCHES NOMINAL IN; Face Seating Surface Condition: MACHINED; Nominal Pipe Size for Which Designed: 1.000 INCHES IN. 18 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.