The Reducer,boss, cataloged under National Stock Number 4730-01-537-4903, 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 3 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-537-4903 |
| Item Name | Reducer,boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Nominal Thread Size | 0.4375 INCHES FIRST END IN |
| Thread Quantity Per Inch | 20 FIRST END |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| 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 |
|---|---|
| AS5174-0602 | 3/1 Design control — primary reference Sae International Dba Sae International |
| AS5174-0602 | 5/9 Secondary reference U.S. Government activity |
| AN919-4-2D | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-537-4903 is a Reducer,boss, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-537-4903: Nominal Thread Size: 0.4375 INCHES FIRST END IN; Part Name Assigned by Controlling Agency: FITTING,UNION AND REDUCER,FLARED; End Item Identification: PORTABLE HYDRAULIC TEST STAND; Thread Quantity Per Inch: 20 FIRST END. 3 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.