| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M24 | 24 | 53 | 36 | 56 | 41 | 26 | 4 | 14 | 7.5 | 28 | 50 |
The M24 increases the Sleeve Length (L1) to 41 mm and expands the Outer Diameter (D) to 53 mm. This extra "meat" on the coupling allows for a larger 24 mm shaft, common in standard metric motor frames.
Extracted from the dimensional table for the M24 configuration:
| Specification | Metric Value |
| Max Bore Capacity (d1 / d2) | 24 mm |
| Outer Diameter (D) | 53 mm |
| Hub Outer Diameter (D1) | 36 mm |
| Total Length (L) | 56 mm |
| Sleeve Length (L1) | 41 mm |
| Standard Hub Length (l1 / l2) | 26 mm |
| No. of Teeth | 28 |
The M24 offers significant mechanical advantages over the M19, particularly in how it handles vibration and misalignment:
Increased Tooth Density: With 28 teeth, the M24 provides a smoother torque curve. More teeth mean a higher contact surface area between the hub and the elastomeric sleeve, reducing the pressure on individual "lugs."
Extended Sleeve (L1): The jump to a 41 mm sleeve length (from the 37 mm used in M14 and M19) allows for better damping of axial and angular misalignment.
Higher Torque Capacity: While specific Nm ratings aren't in this table, the 28-tooth design and 36 mm hub outer diameter indicate a substantial jump in torque handling over the M19.
Extra Long Hub Option: For specialized assemblies, the M24 supports an Extra Long Hub of 50 mm, which is nearly double the standard hub length.
| Feature | M19 | M24 | Change |
| Max Bore | 20 mm | 24 mm | +20% |
| Sleeve Length (L1) | 37 mm | 41 mm | +4 mm |
| Teeth Count | 24 | 28 | +4 Teeth |
| Extra Long Hub | 40 mm | 50 mm | +10 mm |
Medium-Sized Industrial Fans: Where the 28-tooth count helps minimize harmonic vibrations.
Hydraulic Pump Drives: Ideal for connecting electric motors to hydraulic pumps in mobile or stationary equipment.
Material Handling: Used in belt drives and roller conveyors that require a 24 mm shaft fitment.
Summary
The M24 is the first model in the range to lengthen the sleeve ($L1$), providing a more robust interface for 24 mm shafts. It’s the "sweet spot" for engineers needing industrial durability in a package under 60 mm in total length.
