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vb, taps, tapping or tapped. 1. to strike (something) lightly and usually repeatedly: to tap the table; to tap on the table. 2. (tr) to produce by striking in this way: to tap a rhythm. 3. (tr) to strike lightly with (something): to tap one's finger on the desk.
Standard System of Tap Marking. Taps, dies and other types of threading tools are marked according to the Standard System of Marking Ground Thread Taps. Tools are marked with the nominal size, number of threads per inch (pitch), and the appropriate thread form symbol and pitch diameter symbol. Symbols typically used are listed.