D-bore couplings engage directly with the flat surface of the shaft, creating a stable mechanical connection capable of reliably transmitting torque. Unlike traditional set-screw designs, this solution eliminates many of the typical issues associated with conventional mounting methods.

In particular, the benefits include:

• Elimination of slippage on small-diameter shafts
• Increased stability under vibration
• Easier installation with reduced risk of assembly errors
• Higher reliability compared to set-screw systems on shafts < 7 mm
• No need for keyways on the shaft

This configuration is especially effective in compact precision systems, where even micron-level misalignment can negatively affect performance.