The Flange,pipe,swivel Retaining, cataloged under National Stock Number 4730-01-026-8720, 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 22 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-026-8720 |
| Item Name | Flange,pipe,swivel Retaining |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Face Seating Surface Condition | GROUND |
| Surface Treatment Document and Classification | QQ-Z-325,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE |
| Maximum Operating Temp and Media for Which Designed | 212.0 FAHRENHEIT FUEL/OIL, HYDROCARBON DEGF |
| Operating Pressure and Type | 4000.0 POUNDS PER SQUARE INCH (PSI) HYDROCARBON FUEL OR OIL MAXIMUM REQUIRED LBS |
| Flange Section Style | RECESSED FACE, RAISED NECK |
| Style Designator | RECTANGULAR, WITH BOLT HOLES |
| Bolt Hole Diameter | 0.469 INCHES NOMINAL IN |
| Neck Height | 0.320 INCHES NOMINAL IN |
| Recess Depth | 0.295 INCHES NOMINAL IN |
| Flange Length | 3.160 INCHES NOMINAL IN |
| Specification/standard Data | 81349-MIL-F-52525C GOVERNMENT SPECIFICATION |
| Recess Diameter | 2.031 INCHES NOMINAL IN |
| Bolt Hole Quantity | 4 |
| Center to Center Distance Between Bolt Holes Along Length | 2.312 INCHES NOMINAL IN |
| Surface Treatment | ZINC |
| Center to Center Distance Between Bolt Holes Along Width | 1.200 INCHES NOMINAL IN |
| Outside Edge to Bolt Hole Center Distance Along Length | 0.424 INCHES NOMINAL IN |
| Flange Width | 2.860 INCHES NOMINAL IN |
| Material | IRON OR STEEL |
| Furnished Items | SCREW AND PREFORMED PACKING AND LOCK WASHER |
| Outside Edge to Bolt Hole Center Distance Along Width | 0.830 INCHES NOMINAL IN |
| Thickness | 0.560 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 |
|---|---|
| 20PA | 5/9 Secondary reference Imperial |
| MS39296-20B | 5/9 Secondary reference U.S. Government activity |
| MIL-DTL-52525/17 | 4/1 Identification reference U.S. Government activity |
| MIL-F-52525 | 5/9 Secondary reference U.S. Government activity |
| M52525/17-20 | 2/2 Government specification standardization U.S. Government activity |
| 20PA | 5/9 Secondary reference Dayco Industrial |
NSN 4730-01-026-8720 is a Flange,pipe,swivel Retaining, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-075-1945, 4730-01-083-4432, 4730-01-084-3597. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-026-8720: Face Seating Surface Condition: GROUND; Surface Treatment Document and Classification: QQ-Z-325,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE; Maximum Operating Temp and Media for Which Designed: 212.0 FAHRENHEIT FUEL/OIL, HYDROCARBON DEGF; Operating Pressure and Type: 4000.0 POUNDS PER SQUARE INCH (PSI) HYDROCARBON FUEL OR OIL MAXIMUM REQUIRED LBS. 22 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.