Dimension standards assign proper taps outer dimensions (total length, thread length, shank diameter and size of square) of nominal threads dimensions

Dimension standards assign proper taps outer dimensions (total length, thread length, shank diameter and size of square) of nominal threads dimensions. Symbols Description ISO-529 Short hand and machine taps for metric coarse threads, metric fine threads, UNC, UNF, BSW, BSF as well as other kinds of threads not provided by the standard, excluding the pipe threads G, Rp, Rc ISO-2284 Short hand and machine taps for pipe threads G, Rp and Rc DIN-352 Short hand taps for metric coarse threads Norm is also suitable for UNC and BSW threads DIN-2181 Short hand taps for metric fine threads Norm is also suitable for UNF and BSF threads DIN-5157 Short hand taps and machine taps for pipe threads G, Rp DIN-371 Machine taps with reinforced shank for metric coarse and fine threads M3 M10 and for the threads UNC, UNF, BSW, BSF within the range of nominal diameters 1/8” 3/8” DIN-376 Machine taps with reduced shank diameter for metric coarse threads and for the threads UNC and BSW DIN-374 Machine taps with reduced shank diameter for metric fine threads and for the threads UNF i BSF DIN-5156 Machine taps with reduced shank diameter for the threads G, Rp and Rc 3.3. Kinds of chamfers and flutes Chamfers of hand taps Tap in set Metric coarse threads, BSW, UNC Metric fine threads BSF, UNF, UNEF Pipe threads G, Pg Flutes L5 - length of chamfer in threads k - chamfer angle L5 k L5 k L5 k Nr 1 taper tap 8P 5o 8P 5o 5P 7o Nr 2 second tap 4P 10o Straight Nr 3 finishing tap 2P 20o 2P 20o 2P 20o Q 284