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10 most extreme places on Earth. Pitch diameter is a term used to take measurements of the diameter of a gear or a screw using pitch points. Pitch points on a gear could be found if a straight line were drawn up from two of the gear's teeth located side by side and the two lines were connected by a curve.
Save. Bolts commonly use four types of measurement, while nuts use only two. Bolts are measured in length of shank, bolt head size, width of shank (the diameter of the threaded bolt body) and the thread pitch (the size of the thread).Nuts are measured by the width of the hex shape and by their thread pitch.ince the difference between metric and standard length bolts is very slight, most often, this measurement is done in inches. Place the shank of the bolt into the bolt width gauge. This measurement is the diameter of the shank and can be in either metric or standard sizing. Use each to determine the difference.