Calculating Screw Thread Properties Easily

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For calculating screw thread properties easily, for screw threads with a 60 degree included angle thread shape, use the formulas below:

Metric screw sizes are calculated as follows:

• Minor diameter = Major diameter – (1.226869 x pitch)
• Pitch diameter = Major diameter – (.649519 x pitch)
• The tensile stress area = ((root dia + pitch dia) / 2)^2 * Pi/4

Inch screw sizes are calculated as follows:

• Minor diameter = Major diameter – (1.299038 x pitch)
• Pitch diameter = Major diameter – (.649519 x pitch)
• The tensile stress area = ((minor diameter + pitch diameter) / 2)^2 * Pi/4

Of course, you can download DZynSource Mold Engineering Software and not have to do these calculations yourself!