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        • NIB (NUT) TAPS PITCH DIAMETER TOLERANCE TABLE (G GRADE LIMITS)
        • H GRADE LIMITS
        • FLUTELESS TAPS R GRADE LIMITE
        • PIPE THREADS
        • MATERIALS USED FOR THREAD CUTTING TOOLS
        • TAP DRILL HOLE
        • RECOMMENDED TAP DRILL HOLE SIZE
        • RECOMMENDED DRILL HOLE SIZE FOR FLUTELESS TAPS
        • RECOMMENDED TAP DRILL HOLE SIZE FOR HELICAL COIL WIRE INSERT
        • SURFACE TREAMENT FOR TAPS
        • RECOMMENDED TAPPING SPEEDS & LUBRICANTS
        • BASIC PROFILE OF THREADS
        • CONVERSION TABLE FROM INCH TO MILLIMETER
        • HARDNESS CONVERSION TABLE
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  • Ho Hong Precision Tools Co.,Ltd
  • Technical Information
  • RECOMMENDED TAP DRILL HOLE SIZE FOR HELICAL COIL WIRE INSERT

Ho Hong Precision Tools Co.,Ltd

  • Product
  • Technical Information
    • NIB (NUT) TAPS PITCH DIAMETER TOLERANCE TABLE (G GRADE LIMITS)
    • H GRADE LIMITS
    • FLUTELESS TAPS R GRADE LIMITE
    • PIPE THREADS
    • MATERIALS USED FOR THREAD CUTTING TOOLS
    • TAP DRILL HOLE
    • RECOMMENDED TAP DRILL HOLE SIZE
    • RECOMMENDED DRILL HOLE SIZE FOR FLUTELESS TAPS
    • RECOMMENDED TAP DRILL HOLE SIZE FOR HELICAL COIL WIRE INSERT
    • SURFACE TREAMENT FOR TAPS
    • RECOMMENDED TAPPING SPEEDS & LUBRICANTS
    • BASIC PROFILE OF THREADS
    • CONVERSION TABLE FROM INCH TO MILLIMETER
    • HARDNESS CONVERSION TABLE

RECOMMENDED TAP DRILL HOLE SIZE FOR HELICAL COIL WIRE INSERT

○ Metric Coarse Screw Threads

Nominalsize

Hole dia

Drill dia

Max

Min

M2.5×0.45

2.65

2.60

2.6

M2.6×0.45

2.80

2.70

2.7

M3×0.5

3.20

3.12

3.1

M4×0.7

4.30

4.17

4.2

M5×0.8

5.33

5.16

5.2

M6×1.0

6.42

6.25

6.3

M8×1.25

8.52

8.31

8.4

M10×1.5

10.62

10.37

10.5

M12×1.75

12.73

12.43

12.5

M14×2.0

14.83

14.49

14.5

M16×2.0

16.83

16.49

16.5

M18×2.5

19.04

18.58

19.0

M20×2.5

21.04

20.58

21.0

M22×2.5

23.04

22.58

23.0

M24×3.0

25.25

24.70

25.0

○ Metric Fine Screw Threads

Nominalsize

Hole dia

Drill dia

Max

Min

M10×1.0

10.42

10.25

10.3

M10×1.25

10.52

10.31

10.4

M12×1.25

12.52

12.31

12.5

M12×1.5

12.62

12.37

12.5

M14×1.5

14.62

14.37

14.5

M16×1.5

16.62

16.37

16.5

M18×1.5

18.62

18.37

18.5

M20×1.5

20.62

20.37

20.5

M20×2.0

20.83

20.47

20.5

M22×1.5

22.62

22.37

22.5

M24×1.5

24.62

24.37

24.5

M24×2.0

24.83

24.47

24.5

M30×1.5

30.62

30.37

30.5




○ Unified Coarse Screw Threads

Nominalsize

Hole dia

Drill dia

Max

Min

No.2-56UNC

2.39

2.29

2.3

No.3-48UNC

2.74

2.64

2.7

No.4-40UNC

3.07

2.95

3.0

No.5-40UNC

3.38

3.25

3.3

No.6-32UNC

3.81

3.66

3.7

No.8-32UNC

4.47

4.32

4.4

No.10-24UNC

5.21

5.05

5.1

No.12-24UNC

5.77

5.61

5.7

1/4-20UNC

6.78

6.63

6.7

5/16-18UNC

8.48

8.33

8.4

3/8-16UNC

10.11

9.91

10.0

7/16-14UNC

11.76

11.51

11.5

1/2-13UNC

13.34

13.08

13.1

9/16-12UNC

14.94

14.68

14.7

○ Unified Fine Screw Threads

Nominalsize

Hole dia

Drill dia

Max

Min

No.4-48UNF

3.05

2.97

3.0

No.6-40UNF

3.78

3.66

3.7

No.8-36UNF

4.44

4.32

4.4

No.10-32UNF

5.13

4.98

5.0

1/4-28UNF

6.71

6.53

6.6

5/16-24UNF

8.38

8.20

8.2

3/8-24UNF

9.96

9.78

9.8

7/16-20UNF

11.63

11.43

11.5

1/2-20UNF

13.26

13.03

13.1

9/16-18UNF

14.88

14.66

14.7

5/8-18UNF

16.48

16.26

16.3

3/4-16UNF

19.68

19.43

15.9

7/8-14UNF

22.86

22.61

22.7

1-12UNF

26.04

25.76

26.0

HO HONG WORKS CO.,LTD.
HO HONG WORKS CO.,LTD.
No.10, Zhongshan Rd., Luzhu Dist., Kaohsiung City 82152, Taiwan (R.O.C)
TEL : 886-7-6963301
FAX : 886-7-6967780
E-mail : hh.wi@msa.hinet.net
E-mail : sales@hohongwork.com.tw
Ho Hong Precision Tools Co.,Ltd.
No. 14, Xinmin Rd., Luzhu Dist.,
Kaohsiung City 82146, Taiwan (R.O.C.)
TEL : 886-7-6963118
FAX : 886-7-6965550
E-mail : hohong.tools@msa.hinet.net
© 2023 HO HONG WORKS CO.,LTD. All rights reserved. Designed By  Winho
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