|When building or repairing machinery it is often necessary to cut threads by hand, to cut inside threads a tap is used, for outside threads a die is used. There are several different standards for threads, SAE, Metric and British Standard Whitworth are three common examples, for the purpose of this page the SAE standards, will be discussed.
SAE threads come in two styles, fine and coarse, this is determined by the number of threads per inch, for example a fine thread 3/8" bolt would have 24 threads per inch, a course thread bolt would have 16 threads per inch.
There are many different styles of taps used in the industry, however the average person tapping by hand need only concern himself with four styles.
Split adjustable die and hexagon rethreading die.
There are fixed size and split adjustable dies which have a screw to expand the die for a better fit.
Using a Die:
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