What is the best setscrew arrangement for maximum holding power?

The best setscrew arrangement for maximum holding power is positioned at 12 and 9. This configuration is highly effective because it utilizes two setscrews that are diametrically opposed, providing a strong clamping force against the shaft. The positioning at 12 o'clock and 9 o'clock allows for optimal distribution of force around the shaft, reducing the likelihood of slippage during operation.

In applications where maximum holding power is essential, this arrangement helps prevent movement or loosening of components under torque or vibration. The use of two setscrews in this manner ensures that the load is shared evenly, enhancing the overall stability and reliability of the assembly.

Other arrangements have their uses, but they do not provide the same level of opposing forces that results in the optimal grip characteristic of the 12 and 9 arrangement. Thus, it stands out as the best option for scenarios demanding high holding power.