What happens when a castellated nut is preloaded?

When a castellated nut is preloaded, it creates a specific amount of tension in the assembly it is used in. This preloading effectively decreases the radial internal clearance (RIC) within the system. By reducing the RIC, components are held more tightly together, which prevents unwanted movement and helps maintain optimal alignment. This is critical in preventing friction that could lead to heat buildup.

In applications where precision and stability are paramount, such as in bearing assemblies, reducing the RIC helps ensure that the components operate smoothly and efficiently. This tightly packed arrangement prevents excessive play, which can lead to increased wear and tear over time, further emphasizing the importance of preloading in maintaining the effectiveness of mechanical assemblies.

Overall, preloading a castellated nut helps to maintain a controlled and precise operating environment while minimizing friction and associated heat generation, contributing to improved performance and longevity of equipment.