d

p

L

1

d1

3

0,5

56

10

2,2

4

0,7

63

12

2,8

5

0,8

70

14

3,5

6

1

80

16

4,5

8

1,25

90

22

6

10

1,5

100

20

7

12

1,75

110

25

9

14

2

110

30

11

16

2

110

30

12

18

2,5

125

34

14

20

2,5

140

34

16

22

2,5

140

34

18

24

3

160

38

18

Straight flutes, Chamfer form A (5-6threads lead)

Ground profile and relief ground flanks.

 For through holes. Chips are forced ahead in tapping direction

Straight flutes with spiral point, Chamfer form B (4-5 threads lead)

 (2-3 threads lead).

Ground profile and relief ground flanks.

For through holes with 2 x d.

35° Spiral flutes, Chamfer form C
(2-3 threads lead).
Ground profile and relief ground flanks.
For blind holes with 2 x d.
Chips are forced out of the hole against
tapping direction.