If a component is attached with a bolt and a castle tension nut, and the cotter pin hole does not align within the recommended torque range, the acceptable practice is to

If a component is attached with a bolt and a castle tension nut, and the cotter pin hole does not align within the recommended torque range, the acceptable practice is to

• A. Over-Tighten Until Aligned
• B. Change Washers And Try Again
• C. Use A Larger Bolt
• D. Abandon The Installation

Answer: (B)

When a castle nut is tightened to its specified torque, the cotter pin is meant to line up with a hole in the bolt to lock the nut in place. If that cotter pin hole doesn’t align within the recommended torque range, you adjust the assembly by changing the washer stack and rechecking the torque. Using a different washer thickness shifts the nut’s position enough to bring the holes into alignment without exceeding the torque spec, preserving both the preload and the locking function. Over-tightening can damage threads or crush parts, and using a larger bolt or simply abandoning the installation isn’t appropriate when a washer change can fix the alignment. So the acceptable practice is to change washers and try again.

When a castle nut is tightened to its specified torque, the cotter pin is meant to line up with a hole in the bolt to lock the nut in place. If that cotter pin hole doesn’t align within the recommended torque range, you adjust the assembly by changing the washer stack and rechecking the torque. Using a different washer thickness shifts the nut’s position enough to bring the holes into alignment without exceeding the torque spec, preserving both the preload and the locking function. Over-tightening can damage threads or crush parts, and using a larger bolt or simply abandoning the installation isn’t appropriate when a washer change can fix the alignment. So the acceptable practice is to change washers and try again.