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What is thread pitch

Inch

Number of threads per inch

Diameter (inches)      Threads per inch          Type
 3/4  –  10  =  Coarse
 3/4  –  16  =  Fine

Metric

Distance between crests of adjacent threads

Diameter (mm)                  Distance (mm)           Type
M8 X 1.25 = Coarse
M8 X 1 = Fine
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