The Expansion Joint,pipe, cataloged under National Stock Number 4730-01-321-7735, 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 11 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-321-7735 |
| Item Name | Expansion Joint,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Nominal Pipe Size Designation | 4.000 INCHES IN |
| Design Type | SPOOL |
| End Connection Type | FLANGED |
| Traverse Maximum Length | 7.000 INCHES IN |
| Bolt Hole Diameter | 0.562 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | A CLASS AND 1 TYPE |
| Working Pressure Rating | 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Bolt Hole Quantity | 8 |
| Bolt Circle Diameter | 4.500 INCHES NOMINAL IN |
| Material | COPPER ALLOY FLANGE |
| Joint Type | SINGLE |
| 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 |
|---|---|
| MILE15330DCLATY1SZ4X10-3/4#150 | 5/9 Secondary reference U.S. Government activity |
| MIL-E-15330 | 5/9 Secondary reference U.S. Government activity |
| ASTM F1123 | 3/1 Design control — primary reference U.S. Government activity |
NSN 4730-01-321-7735 is a Expansion Joint,pipe, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-321-7738, 4730-01-321-7739, 4730-01-321-7740. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-321-7735: Nominal Pipe Size Designation: 4.000 INCHES IN; Design Type: SPOOL; End Connection Type: FLANGED; Traverse Maximum Length: 7.000 INCHES IN. 11 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.