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What is the difference between screw pitch and lead?

What is the difference between screw pitch and lead?

Pitch

Pitch is the distance between screw threads and is commonly used with inch sized products and specified as threads per inch.

Lead

Lead is the linear travel the nut makes per one screw revolution and is how ball screws are typically specified.

For a single start thread, lead is equal to the pitch.  For multiple start screws the lead is the pitch multiplied by the number of starts.

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