What is the largest diameter feature of a workpiece, especially noted in threading?

The largest diameter feature of a workpiece, particularly in the context of threading, is referred to as the major diameter. This dimension is critical because it represents the outermost diameter of the external threads on a bolt or screw, providing important information for fit and tolerance in mating components. The major diameter is essential for ensuring that the threading works correctly when paired with a matching internal thread.

In threading, understanding the major diameter is crucial for selecting the appropriate tools and settings for machining, as it influences the strength and load-bearing capacity of the threaded connection. While other diameters like minor diameter and nominal diameter are also relevant in the context of threading, they refer to smaller dimensions, thus making the major diameter the key figure for determining the overall size of the threaded feature.