the difference between the min and max effective of your two threads will tell you if there going to clash on assembly
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when lead of the screw is equal to the pitch it is called single threaded screw
First calibrate the micrometer by dialing the spindle to zero and adjusting the anvil until it is flush against the spindle. Measure the screw until the ratchet begins to click and take the first reading. This reading can then be compared to a machining book to verify the pitch diameter.
acme thread
6 is the diameter of the bolt whereas 32 is the thread pattern. Usually used in machine screws.
There are all sorts of screw diameters - major, minor, pitch, mean, etc., but in general a screw diameter is a called by its nominal diameter which is the major diameter of the screw, approximately. For example a 1/2 inch screw has a nominal diameter of 1/2 inch.