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What is the screw’s thread?

 
         
  Picture of a screw with labelled thread, ridges (threads) and grooves  

The thread is the ridge that runs around the screw’s body.

 

When viewed from the side, a screw’s thread looks like a series of ridges and grooves along the screw’s body. Although these ridges are all part of a single thread, they are referred to as the threads.

 
         
  Labelled pitch on a picture of a screw  

Pitch

The pitch is the distance from one ridge to the next.

 

This measurement will tell you how far the screw will travel in one rotation. A screw with a greater pitch (more space between threads) will travel further in one rotation.