Chamfers of machine taps according to DIN-2197 Kind of chamfer -symbol Chamfer length presented in the quantity of the thread coils Chamfer angle Kind

Chamfers of machine taps according to DIN-2197 Kind of chamfer -symbol Chamfer length presented in the quantity of the thread coils Chamfer angle Kind of flutes Usage A (6 8)P 5o Straight Short through holes B (3,5-5,5)P 8o Straight with spiral point Different length through holes in materials forming medium and long chips C (2-3)P 15o Straight or spiral Blind holes, through holes in materials forming short chips D (3,5-5)P 8o Through holes, blind holes with long thread runout E (1,5-2)P 23o Blind holes with a very short thread runout. Used for brass Apart from above there are also used chamfers (12 16)P for nut taps and 24P for trapezoidal taps. Flutes of machine taps according to DIN-2197 rfTI 1111s- Straight Straight with spiral point Right hand spiral flutes rfTI 11 l>w R15 10°<у2<20° R25 20°<у2<30° R40 30°<у2<40° R45 40°<у2<50° Chamfer A, D C, E B Usage C, E Through Blind Through Short, medium Medium, long Blind Medium, long Left hand spiral flute L15 10o