Каталог Iscar высокоточные развертки и метчики 2022 - страница 53

TAPS USER GUIDE Tap Nomenclature and Standards DIN 371 Chamfer Lead Length for Sets of 3 Hand Taps L5 L3d4d2 ca. 6 threads ca. 4 threads ca. 2 threads D d3 Cm L1 L4 L2 S L First taper tap Second tap Bottoming tap D - Major diameter d2 - Shank diameter Tap Styles for Hole Types d3 - Chamfer diameter Throughole d4 - Neck diameter DIN 376 1 Straight fluted tap with spiral point Cf L6 d4 D d3 L1 L4 L2L 2 Left-hand spiral fluted tap L - Total length L - Total length L1 - Thread length L2 - Shank length L3 - Square length 3 Straight fluted tap with long chamfer lead L4 - Neck length L5 - Chamfer length Blind hole L6 - Flute length S - Square size Cm - Center male Cf - Center female 1 Right-hand spiral fluted tap Chamfer Lead Forms According to DIN 2197 6-8 threads Form A A Long, 6-8 threads for short through holes. 2 Straight fluted tap with short chamfer lead 3.5-5 threads Form B B Medium, 3.5-5 threads, with spiral point for all through holes Front and End Configurations According to DIN2197 and deep tapping holes. Front End Shank End 1 External Center 4 External Center 2-3 threads Form C C Long, 2-3 threads for blind holes and generally for aluminum grey cast iron and brass. 2 Stepped External Center 5 Chamfer 3.5-5 threads Form D D Medium, 3.5-5 threads for through and blind holes with sufficient runout. 3 Internal Center 6 Internal Center 1.5-2 threads Form E E Extremely short, 1.5-2 threads for blind holes with little runout depth. Avoid use if possible. Thread Dia.Range (mm)Front End Shank End Tap Standard 1-1.5 threads Form F ≤Ø6 1 4 5 DIN352 F Extremely short, 1-1.5 threads Ø7 1 2 4 5 6 DIN371 for blind holes with little runout ≥Ø8 1 2 3 5 6 DIN376 depth. Avoid use if possible. 363