Untitled Document Metric Fine Mf M 7 x 0.75 7 mm Hand Taps Serial Form Taps are to din 352 HSS-G Tolerance ISO2/6H This form of Hand Tap consists of 2 taps for Metric Fine threads made up of a Roughing Tap and a Finishing tap (see below for more information). This form of tap is ideal for tougher materials because the thread is formed in stages as opposed to NON serial taps which form the thread in one pass and use the conventional Taper Second and plug. The roughing tap which takes out half the thread area is marked with a ring on the shank for identification. Only the plain shanked Finish tap cuts SIZE. This form of hand tap is recommended for materials like stainless steel and non-abrasive materials up to 900N/mm2 .