Threads are measured in what unit?

Threads are measured in what unit?

• A. Threads per inch
• B. Bolt diameter
• C. Length of bolt
• D. Head type

Answer: (A)

Threads are measured by how many threads fit in one inch of length, called threads per inch. This is the standard way to specify imperial (SAE) screw threads. The diameter of the bolt is a separate measurement, and the length describes how long the bolt is. The head type is about the shape of the bolt head, not the threading. For example, a bolt described as 1/4-20 has a major diameter of 1/4 inch and 20 threads per inch, illustrating how the thread count per inch defines the threading. In metric fasteners, threading is described by pitch in millimeters, not per inch. So, the unit for measuring threads in this context is threads per inch.

Threads are measured by how many threads fit in one inch of length, called threads per inch. This is the standard way to specify imperial (SAE) screw threads. The diameter of the bolt is a separate measurement, and the length describes how long the bolt is. The head type is about the shape of the bolt head, not the threading. For example, a bolt described as 1/4-20 has a major diameter of 1/4 inch and 20 threads per inch, illustrating how the thread count per inch defines the threading. In metric fasteners, threading is described by pitch in millimeters, not per inch. So, the unit for measuring threads in this context is threads per inch.