The Flange,pipe, cataloged under National Stock Number 4730-00-174-5939, 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18 specifications, cited from the U.S. Government catalog. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-174-5939 |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Socket Diameter | 0.875 INCHES NOMINAL IN |
| Flange Diameter | 3.750 INCHES MINIMUM AND 3.828 INCHES MAXIMUM IN |
| Face Seating Surface Condition | MACHINED |
| Nominal Pipe Size for Which Designed | 0.500 INCHES IN |
| Socket Depth | 0.395 INCHES NOMINAL IN |
| Maximum Operating Temp and Media for Which Designed | 850.0 FAHRENHEIT STEAM AND 425.0 FAHRENHEIT WATER DEGF |
| Operating Pressure and Type | 600.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 1000.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS |
| Flange Section Style | RAISED FACE, SOCKET NECK |
| Style Designator | ROUND, ONE BOLT HOLE CIRCLE |
| Bolt Hole Diameter | 0.625 INCHES NOMINAL IN |
| Neck Height | 0.300 INCHES NOMINAL IN |
| Bolt Hole Quantity | 4 |
| Bolt Circle Diameter | 2.625 INCHES NOMINAL IN |
| Raised Face Diameter | 1.375 INCHES MINIMUM AND 1.443 INCHES MAXIMUM IN |
| Raised Face Height | 0.250 INCHES NOMINAL IN |
| Surface Treatment | PRIMER |
| Material | STEEL |
| Thickness | 0.595 INCHES MINIMUM AND 0.645 INCHES MAXIMUM 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 |
|---|---|
| 135172E PIECE 60 | 5/9 Secondary reference The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company |
| 5000S4823-64496 | 5/9 Secondary reference U.S. Government activity |
| 135172E | D/9 Drawing number reference only The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company |
| 80863C | 5/9 Secondary reference The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company |
| 152 1-2 INCH A182-F11STL | 5/1 Secondary reference Tube Turns Technologies Inc |
| 80863C | C/1 Advisory reference — outside the item-of-supply concept Babcock & Wilcox Co |
| 135172E PIECE 60 | C/1 Advisory reference — outside the item-of-supply concept Babcock & Wilcox Co |
| M18180/2-52A09A | 2/2 Government specification standardization U.S. Government activity |
NSN 4730-00-174-5939 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): 4530-01-129-7779. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-174-5939: Socket Diameter: 0.875 INCHES NOMINAL IN; Flange Diameter: 3.750 INCHES MINIMUM AND 3.828 INCHES MAXIMUM IN; Face Seating Surface Condition: MACHINED; Nominal Pipe Size for Which Designed: 0.500 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.