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Screw Sizes & Threads


The following table provides the equivalant measurements in inches (fractions & decimals) and millimeters for various screw sizes.  The second table provides the number of threads per inch for coarse (UNC) and fine (UNF) threads for various size screws and bolts.  The first number is the diameter of the screw/bolt in inches and the second is the number of threads per inch.  And screws of almost all of these sizes can be found here.