progressive tap, from M5 with lubricating grooves, HSS-E, vaporized, metric ISO-thread, right thread, Tolerance field ISO2 / 6H, forme of taper lead B (3.5-5.5 x P), cylinder shank with square piece, number of teeth 2-3 Power class N For long-chipping materials with a tensile strength of Rm > 350...1000 N/mm2. Length of taper lead: M2: 2.5 x P M2.5...M12: 4 x P Hole Type: through holes < 1.5 x d. Designs: M2: N330V-3, reinforced shaft, DIN 371 M2.5...M6: N330V-4, reinforced shaft, DIN 371 M8...M12: N430V-4, falling through shaft, DIN 376