Intro to Millwright Practice Exam 2025 - Free Millwright Skills Practice Questions and Study Guide

A chaser nut is primarily used for repairing damaged external threads. This specialized nut is designed to restore the integrity of threads on bolts or similar fasteners when they have become worn or damaged over time. The chaser nut has internal threads that are configured to match the size and pitch of the external threads it is meant to repair, allowing it to effectively re-establish the necessary grip and functionality.

When dealing with fasteners, maintaining a good thread condition is critical for ensuring secure connections. Damaged threads can lead to issues such as loosening of bolts, loss of tension, and potential failure of the connection under stress. By using a chaser nut, technicians can extend the life of components without the need for complete replacement, which is both economically and operationally beneficial.

In contrast, options related to creating new threads, securing bolt connections, or increasing torque do not accurately represent the primary function of a chaser nut, as those tasks are typically handled by different tools or methods, such as die sets for thread creation or locking mechanisms for securing connections.