Machine Drawing

444 Machine Drawing

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d:\N-Design\Des23-1.pm5

Fine series

Coarse series

Table 5 Dimensions for metric screw threads (mm)

Size Pitch Major Minor diameter Depth of

diameter

Pitch diameter

Bolt Nut thread

M2.5 0.45 2.5 2.208 1.948 2.013 0.276

M3 0.5 3 2.675 2.387 2.459 0.307

M4 0.7 4 3.545 3.141 3.242 0.429

M5 0.8 5 4.480 4.019 4.134 0.491

M6 1 6 5.350 4.773 4.918 0.613

M8 1.25 8 7.188 6.466 6.647 0.767

M10 1.5 10 9.026 8.160 8.376 0.920

M12 1.75 12 10.863 9.853 10.106 1.074

M16 2 16 14.701 13.543 13.835 1.227

M20 2.5 20 18.376 16.933 17.294 1.534

M24 3 24 22.051 20.320 20.752 1.840

M30 3.5 30 27.727 25.706 26.211 2.147

M33 3.5 33 30.727 28.706 29.211 2.147

M36 4 36 33.402 31.093 31.67 2.454

M8 × 1 1 8 7.350 6.773 6.918 0.613

M10 × 1.25 1.25 10 9.188 8.466 8.647 0.767

M12 × 1.25 1.25 12 11.188 10.466 10.647 0.767

M16 × 1.5 1.5 16 15.026 14.16 14.376 0.920

M20 × 1.5 1.5 20 19.026 18.16 18.376 0.920

M24 × 2 2 24 22.701 21.546 21.835 1.227

M30 × 2 2 30 28.701 27.546 27.835 1.227

M36 × 3 3 36 34.051 32.32 35.752 1.840

Table 6 Tap drill sizes

Metric coarse threads British Standard Whitworth (BSW) threads

Size Pitch Max. minor Drill size size Threads per Max. minor Drill size

(mm) (mm) diameter (mm) (inch) inch diameter (mm)

(mm) (mm)

1.4 0.3 1.165 1.1 1/16 60 1.231 1.2

1.6 0.35 1.321 1.25 3/32 48 1.910 1.85

1.8 0.35 1.521 1.45 1/8 40 2.590 2.55

2 0.4 1.679 1.6 5/32 32 3.211 3.2

2.2 0.45 1.838 1.75 3/16 24 3.744 3.7

2.5 0.45 2.138 2.05 7/32 24 4.538 4.5

3 0.5 2.599 2.5 1/4 20 5.224 5.1

3.5 0.6 3.010 2.9 5/16 18 6.661 6.5

4 0.7 3.422 3.3 3/8 16 8.052 7.9

4.5 0.75 3.878 3.7 7/16 14 9.379 9.2

5 0.8 4.334 4.2 1/2 12 10.610 10.5

6 1 5.153 5 9/16 12 12.176 12

7 1 6.153 6 5/8 11 13.598 13.5

8 1.25 6.912 6.8 3/4 10 16.538 16.5

9 1.25 7.912 7.8 7/8 9 19.411 19.25

10 1.5 8.676 8.5 1 8 22.185 22

11 1.5 9.676 9.5 1 1/8 7 24.879 24.75

12 1.75 10.441 10.2 1 1/4 7 28.058 28

14 2 12.210 12 1 3/8 6 30.555 30.5

16 2 14.210 14 1 1/2 6 33.730 33.5

(Contd.)