Screw thread netherlands

There are different kind of screw threads.

Metrical , Gas and Trapezium

Metrical will be often used for bolts and nuts.

Gas will be used in and on pipes. ( no description )

Trapezium will be often used on machines for transportation.

 

Metrical :

The angle of a tooth is 60 degree.

When you want to make screw thread in a hole you must drill the hole with this diameter in normal material.

                   Drill

Type    Diam  Pitch

--------------------------

M3      2.5       0.5

M4      3.3       0.7

M5      4.2       0.8

M6      5          1

M8      6.8       1.25

M10    8.5       1.5

M12    10.2     1.75

M16    14        2

M18    15.5     2.5

M20    17.5     2.5

When you have strong material you can use a 2% - 4% bigger drill.
Example drill 5mm will be 5.1mm or 5.2 mm

Trapezium thread.

The indication of Trapezium thread is for example : 22 X 5 that means that on a bolt the outside diameter is 22 mm and the pitch is 5 mm.

The angle of a tooth is 30 degree

Here is a table where you can see what drill diameter you must use when you makes a nut.

                                    Drill      Biggest

D x P          Diam    Diam in nut

----------------------------------

 8 X 1.5          6.5       8.3

 9 X 2             7          9.5

10 X 2             8          10.5

11 X 2             9          11.5

12 X 3             9          12.5

14 X 3             11        14.5

16 X 4             12        16.5

18 X 4             14        18.5

20 X 4             16        20.5

22 X 5             17        22.5

24 X 5             19        24.5

26 X 5             21        26.5

28 X 5             23        28.5

30 X 6             24        31

32 X 6             26        33

34 X 6             28        35

36 X 6             30        37

38 X 7             31        39

40 X 7             33        41

42 X 7             35        43

44 X 7             37        45

46 X 8             38        47

48 X 8             40        49

50 X 8             42        51

  as you can see : 
 the drill diameter =  the outside size of a bolt  –  the pitch.