The Flange,pipe, cataloged under National Stock Number 4730-00-256-8554, 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 14 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 10 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-256-8554 |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Flange Diameter | 4.250 INCHES NOMINAL IN |
| Face Seating Surface Condition | SERRATED |
| Nominal Pipe Size for Which Designed | 1.000 INCHES IN |
| Maximum Operating Temp and Media for Which Designed | 775.0 FAHRENHEIT STEAM AND 300.0 FAHRENHEIT GAS AND 300.0 FAHRENHEIT OIL AND 300.0 FAHRENHEIT WATER DEGF |
| Operating Pressure and Type | 150.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 200.0 POUNDS PER SQUARE INCH (PSI) GAS MAXIMUM REQUIRED AND 200.0 POUNDS PER SQUARE INCH (PSI) OIL MAXIMUM REQUIRED AND 200.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS |
| Flange Section Style | PLAIN FACE |
| Style Designator | ROUND, ONE BOLT HOLE CIRCLE |
| Bolt Hole Diameter | 0.562 INCHES NOMINAL IN |
| Departure From Cited Designator | AS MODIFIED BY THK OF FLANGE |
| Nondefinitive Spec/std Data | C TYPE |
| Bolt Hole Quantity | 4 |
| Bolt Circle Diameter | 3.125 INCHES NOMINAL IN |
| Material | STEEL |
| Thickness | 0.438 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 |
|---|---|
| B110TYPEC | 5/1 Secondary reference U.S. Government activity |
| MILF20670 | 5/9 Secondary reference U.S. Government activity |
| MILF20670 | 5/1 Secondary reference U.S. Government activity |
| MIL-F-20670, TYPE C, SZ 1 INCH | 2/2 Government specification standardization U.S. Government activity |
| MILF20670 | 4/1 Identification reference U.S. Government activity |
NSN 4730-00-256-8554 is a Flange,pipe, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
10 possible matches (shared part number, not a government interchangeability claim): 4730-00-256-8555, 4730-00-256-8556, 4730-00-256-8557. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-256-8554: Flange Diameter: 4.250 INCHES NOMINAL IN; Face Seating Surface Condition: SERRATED; Nominal Pipe Size for Which Designed: 1.000 INCHES IN; Maximum Operating Temp and Media for Which Designed: 775.0 FAHRENHEIT STEAM AND 300.0 FAHRENHEIT GAS AND 300.0 FAHRENHEIT OIL AND 300.0 FAHRENHEIT WATER DEGF. 14 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.