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HeliCoil / ArmaCoil Screw Thread Insert Lengths & Drill Sizes

Metric

Insert Size

Drill Size

Screw Thread Insert Length

1D

1.5D

2D

2.5D

3D

M2 x 0.4

2.10

2.00

3.00

4.00

5.00

6.00

M2.2 x 0.45

2.30

2.20

3.30

4.40

5.50

6.60

M2.5 x 0.45

2.60

2.50

3.75

5.00

6.25

7.50

M3 x 0.5

3.10

3.00

4.50

6.00

7.50

9.00

M3.5 x 0.6

3.60

3.50

5.25

7.00

8.75

10.50

M4 x 0.7

4.10

4.00

6.00

8.00

10.00

12.00

M4.5 x 0.75

4.70

4.50

6.75

9.00

11.25

13.50

M5 x 0.8

5.20

5.00

7.50

10.00

12.50

15.00

M6 x 1.0

6.20

6.00

9.00

12.00

15.00

18.00

M7 x 1.0

7.20

7.00

10.50

14.00

17.50

21.00

M8 x 1.0

8.20

8.00

12.00

16.00

20.00

24.00

M8 x 1.25

8.30

8.00

12.00

16.00

20.00

24.00

M9 x 1.25

9.30

9.00

13.50

18.00

22.50

27.00

M10 x 1.0

10.30

10.00

15.00

20.00

25.00

30.00

M10 x 1.25

10.30

10.00

15.00

20.00

25.00

30.00

M10 x 1.5

10.30

10.00

15.00

20.00

25.00

30.00

M11 x 1.5

11.30

11.00

16.50

22.00

27.50

33.00

M12 x 1.25

12.30

12.00

18.00

24.00

30.00

36.00

M12 x 1.5

12.40

12.00

18.00

24.00

30.00

36.00

M12 x 1.75

12.40

12.00

18.00

24.00

30.00

36.00

M14 x 1.25

14.30

14.00

21.00

28.00

35.00

42.00

M14 x 1.5

14.30

14.00

21.00

28.00

35.00

42.00

M14 x 2.0

14.30

14.00

21.00

28.00

35.00

42.00

M16 x 1.5

16.25

16.00

24.00

32.00

40.00

48.00

M16 x 2.0

16.50

16.00

24.00

32.00

40.00

48.00

M18 x 1.5

18.25

18.00

27.00

36.00

45.00

54.00

M18 x 2.0

18.50

18.00

27.00

36.00

45.00

54.00

M18 x 2.5

18.50

18.00

27.00

36.00

45.00

54.00

M20 x 1.5

20.25

20.00

30.00

40.00

50.00

60.00

M20 x 2.0

20.50

20.00

30.00

40.00

50.00

60.00

M20 x 2.5

20.50

20.00

30.00

40.00

50.00

60.00

M22 x 1.5

22.50

22.00

33.00

44.00

55.00

66.00

M22 x 2.0

22.50

22.00

33.00

44.00

55.00

66.00

M22 x 2.5

22.50

22.00

33.00

44.00

55.00

66.00

M24 x 1.5

24.25

24.00

36.00

48.00

60.00

72.00

M24 x 2.0

24.25

24.00

36.00

48.00

60.00

72.00

M24 x 3.0

24.75

24.00

36.00

48.00

60.00

72.00

M27 x 2

27.50

27.00

40.50

54.00

67.50

81.00

M27 x 3.0

27.50

27.00

40.50

54.00

67.50

81.00

M30 x 1.5

30.50

30.00

45.00

60.00

75.00

90.00

M30 x 2.0

30.50

30.00

45.00

60.00

75.00

90.00

M30 x 3.5

30.50

30.00

45.00

60.00

75.00

90.00

M33 x 2.0

33.50

33.00

49.50

66.00

82.50

99.00

M36 x 2.0

36.50

36.00

54.00

72.00

90.00

108.00

M36 x 4.0

36.50

36.00

54.00

72.00

90.00

108.00

M39 x 2.0

39.50

39.00

58.50

78.00

97.50

117.00

M39 x 4.0

39.50

39.00

58.50

78.00

97.50

117.00

Armstrong Precision Components UK
Emhart Technologies USA
Bollhoff HeliCoil Germany

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