| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| I80 | 31/90 | 178 | 124 | 186 | 93 | 90 | 6 | 20 | 46.5 | 46 | NA |
The I 80 is a giant compared to the M-series, nearly doubling the outer diameter of the M48 and reaching a Total Length (L) of 186 mm.
Extracted from the dimensional table for the I 80 configuration:
| Specification | Metric Value |
| Max Bore Capacity (d1 / d2) | 31 / 90 mm |
| Outer Diameter (D) | 178 mm |
| Hub Outer Diameter (D1) | 124 mm |
| Total Length (L) | 186 mm |
| Sleeve Length (L1) | 93 mm |
| Standard Hub Length (l1 / l2) | 90 mm |
| Space Between Hubs (l3) | 6 mm |
| No. of Teeth | 46 |
The I 80 introduces several mechanical shifts necessary for large-scale power transmission:
Massive Bore Range (31/90): The I 80 can accommodate a huge range of shaft sizes, from a 31 mm pilot up to a massive 90 mm bore. This makes it the standard choice for large industrial motor frames (such as NEMA 400 series or IEC 280+).
Extended Hub Engagement: The hub length ($l1/l2$) is 90 mm, nearly double that of the M48. This ensures that the massive torque generated by large motors is spread across a deep section of the shaft, preventing keyway deformation.
Increased Axial Gap ($l3$): While all "M" models featured a 4 mm gap, the I 80 increases this to 6 mm. This extra clearance is vital in large machinery where thermal expansion of long shafts can be significant.
46-Tooth Configuration: It utilizes 46 teeth. At this diameter (178 mm), these teeth are extremely thick and robust, designed to dampen the low-frequency vibrations often found in high-horsepower, slow-speed applications.
| Feature | M65 | I 80 | Change |
| Total Length (L) | 114 mm | 186 mm | +63% |
| Outer Dia (D) | 132 mm | 178 mm | +35% |
| Hub Length (l1) | 55 mm | 90 mm | +35 mm |
| Max Bore | 65 mm | 90 mm | +25 mm |
Municipal Water Pumps: Driving large-volume pumps for city water supplies or wastewater treatment.
Heavy-Duty Gearbox Couplings: Connecting primary motor drives to large industrial speed reducers.
Power Plant Auxiliaries: Used in cooling towers and large-scale ventilation fans.
Cement & Steel Mills: Driving heavy rollers and conveyors where 90 mm shafts are the standard.
Summary
The I 80 is a heavy-duty industrial solution. It offers a massive 90 mm bore capacity and a 186 mm length, making it suitable for the most demanding high-torque environments where reliability is measured in years of continuous service.
