• FLUTELESS (FORMING) TAPS

FLUTELESS (FORMING) TAPS


Using plastic working to produce internal thread, this tap is suitable tapping for low carbon steel, alloy steel, stainless steel and nonferrous metals good stringy materials.


Features of fluteless taps


•They are suitable for blind hole tapping in producing internal thread with no chips, they save you a time for disposal chip.

•The effect of fluteless gives a large cross-section area to the tap that effectively eliminates the problem of chip jamming and thus make roll very strong.

•Fluteless tap produce excellent pitch diameter well within pitch diameter tolerances.

•Material defomation process produces the internal thread with good surface finish as well as precise pitch diameter.


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Metric thread nominal size

Tap limit

Specification

Class 2 drill hole dia

A

B

C

E

F

Min-Max

Thread overlap ratio %

M3 x 0.5

R5

46

9

4

6

3.2

2.76 ~ 2.81

100 ~ 75

M3.5 x 0.6

R5

48

11

4

6

3.2

3.20 ~ 3.26

100 ~ 75

M4 x 0.7

R6

52

12

5

7

4

3.65 ~ 3.70

100 ~ 85

M5 x 0.8

R6

60

14.5

5.5

7

4.5

4.59 ~ 4.66

100 ~ 80

M6 x 1.0

R7

62

17.5

6

7

4.5

5.48 ~ 5.57

100 ~ 80

M7 x 1.0

R7

65

13

6.2

8

5

6.48 ~ 6.57

100 ~ 80

M8 x 1.25

R7

70

18

6.2

8

5

7.34 ~ 7.41

100 ~ 85

M10 x 1.25

R7

75

19

7

8

5.5

9.34 ~ 9.41

100 ~ 85

M10 x 1.5

R7

75

19

7

8

5.5

9.18 ~ 9.28

100 ~ 85

M12 x 1.75

R8

82

23

8.5

9

6.5

11.05 ~ 11.15

100 ~ 85

M14 x 2

R10

88

25

10.5

11

8

12.92 ~ 13.04

100 ~ 85

M16 x 2

R10

95

27

12.5

13

10

14.92 ~ 15.04

100 ~ 85

M18 x 2.5

R11

100

29

14

14

11

16.63 ~ 16.78

100 ~ 85

M20 x 2.5

R11

105

30

15

15

12

18.63 ~ 18.78

100 ~ 85




Unified thread nominal size

Tap limit

Specification

Class 2B drill hole dia

A

B

C

E

F

Min-Max

Thread overlap ratio %

NO.4-40 UNC

R5

46

9

4

6

3.2

2.53 ~ 2.60

100 ~ 70

NO.5-40 UNC

R5

46

9

4

6

3.2

2.86 ~ 2.93

100 ~ 70

NO.6-32 UNC

R5

48

11

4

6

3.2

3.09 ~ 3.17

100 ~ 75

NO.8-32 UNC

R6

52

12

5

7

4

3.76 ~ 3.84

100 ~ 75

NO.10-24 UNC

R6

60

14.5

5.5

7

4.5

4.26 ~ 4.35

100 ~ 80

NO.12-24 UNC

R6

60

14.5

5.5

7

4.5

4.92 ~ 5.01

100 ~ 80

1/4-20 UNC

R7

62

17.5

6

7

4.5

5.67 ~ 5.78

100 ~ 80

5/16-18 UNC

R7

70

22

6.1

8

5

7.18 ~ 7.29

100 ~ 80

3/8-16 UNC

R7

75

21

7

8

5.5

8.66 ~ 8.78

100 ~ 80

7/16-14 UNC

R7

80

23

8

9

6

10.11 ~ 10.25

100 ~ 80

1/2-13 UNC

R8

85

25

9

10

7

11.62 ~ 11.78

100 ~ 80

5/8-11 UNC

R11

95

27

12

12

9

14.62 ~ 14.76

100 ~ 85

3/4-10 UNC

R12

105

30

14

14

11

17.67 ~ 17.88

100 ~ 80





1.  By powder metallurgy and special high-speed steel HSSE and special thread, long tool life processing is possible at wide.

2.  TIN, TICN coating, suitable for tapping steel and nonferrous metal alloy, capable of efficient, long life, high speed tapping.

The specification of standard coarse screw thread and standard fine screw thread are the same.