| Size SleeveX | Max. Bore d1 / d2 mm | Outer Dia D mm | Hub Outer D1 Dia mm | Total Length L mm | Sleeve Length L1 mm | Hub Length l1 / l2 mm | Space Betⁿ Hubs l3 mm | l4 | l5 | No. of Teeth | Extra Long Hub Length l1 / l2 mm |
|---|---|---|---|---|---|---|---|---|---|---|---|
| I125 | 45/125 | 270 | 192 | 290 | 134 | 140 | 10 | 30 | 78 | 54 | NA |
The I 125 is a monumental piece of hardware. With a Total Length (L) of 290 mm, it is nearly 30 cm long and has an Outer Diameter (D) of 270 mm, making it the largest and heaviest coupling in the catalog.
Extracted from the final row of the dimensional table:
| Specification | Metric Value |
| Max Bore Capacity (d1 / d2) | 45 / 125 mm |
| Outer Diameter (D) | 270 mm |
| Hub Outer Diameter (D1) | 192 mm |
| Total Length (L) | 290 mm |
| Sleeve Length (L1) | 134 mm |
| Standard Hub Length (l1 / l2) | 140 mm |
| Space Between Hubs (l3) | 10 mm |
| No. of Teeth | 54 |
The I 125 is engineered to be the final word in stability for large-scale power transmission:
Maximum Bore Range (45/125): This coupling can handle shafts from 45 mm up to a massive 125 mm. This range is typically found on the largest electric motors and industrial turbine outputs.
Exceptional Hub Depth: The hub length ($l1/l2$) is 140 mm. This provides a massive surface area for shaft engagement, essential for transmitting the high torque levels of utility-scale equipment without risking shaft deformation.
The 10 mm Gap ($l3$): This is the largest axial clearance in the series. It is specifically designed to accommodate the significant thermal expansion and axial "float" common in very large industrial pumps and gearboxes.
54-Tooth Precision: With 54 teeth, the I 125 offers the highest resolution in the entire series. Despite its massive size, this high tooth count ensures incredibly smooth power delivery and the highest possible level of vibration dampening for sensitive, high-value machinery.
| Feature | I 100 | I 125 | Change |
| Total Length (L) | 228 mm | 290 mm | +62 mm |
| Outer Dia (D) | 210 mm | 270 mm | +60 mm |
| Hub Length (l1) | 110 mm | 140 mm | +30 mm |
| Teeth Count | 48 | 54 | +6 Teeth |
Major Infrastructure Pumps: Used in massive irrigation projects or primary flood-control pump stations.
Large Industrial Turbines: Connecting power-generation turbines to high-capacity generators.
Heavy Mining Machinery: Driving the main gearsets for large-scale ball mills or heavy-duty skip hoists.
Steel Mill Main Drives: Used in the primary rolling and crushing sections of metal processing plants.
Summary
The I 125 is the ultimate solution for large-bore, high-torque industrial applications. Its 54-tooth design and 290 mm length provide unparalleled stability and shock absorption for the largest shafts in the industry.
