Thread-forming screw – Taptite

Thread-forming screw – Taptite

Hole recommendation and tensile strength for Taptite

Taptite thread can press threads into sheet metal and profiles made of:
- Steel, with hardness up to 250 HB
- Aluminium and copper, and their alloys.
- Castings of iron, steel, aluminium, magnesium, zinc and copper alloys.

Thread diameters Taptite II

 Some description

Thread

dt Max.

Min

C Max.

Min
M 2,5
M 3
M 4
2,48
2,97
3,94
2,31
2,88
3,84
2,57
3,07
4,08
2,48
2,98
3,98
M 5
M 6
M 8
4,93
5,9
7,88
4,82
5,77
7,72
5,09
6,1
8,13
4,98
5,97
7,97
M 10
M 12
9,85
11,83
9,67
11,68
10,15
12,18
9,97
11,97

Drilled or punched holes in carbon steel with 110-130 HB

Thread

Material thickness or length of engagement

0.5-1.5

1.5-2.5

2.5-4

4-6.5

6.5-10

10-15

15-

Hole diameter D

M 2.5
M 3
M 4

2.25
2.7
3.6

2.3
2.75
3.65

2.35
2.8
3.65

2.35
2.8
3.7

-
2.8
3.75

-
-
-

-
-
-

M 5
M 6
M 8

-
-
-

4.55
5.45
-

4.6
5.5
7.3

4.65
5.55
7.4

4.7
5.6
7.45

-
5.65
7.55

-
-
7.6

M 10
M 12

-
-

-
-

9.2
-

9.25
11.05

9.3
11.15

9.4
11.25

9.45
11.35


  Drilled or punched holes in light metal aluminium with 80-120 HB

Thread

Material thickness or length of engagement

0.5-1.5

1.5-2.5

2.5-4

4-6.5

6.5-10

10-15

15-

Hole diameter D

M 2.5
M 3
M 4

2.25
2.7
3.6

2.25
2.75
3.6

2.3
2.75
3.65

2.35
2.8
3.7

-
2.8
3.75

-
-
-

-
-
-

M 5
M 6
M 8

-
-
-

4.55
5.45
-

4.6
5.45
7.3

4.6
5.5
7.4

4.65
5.55
7.4

-
5.6
7.5

-
-
7.55

M 10
M 12

-
-

-
-

9.2
-

9.25
11.05

9.25
11.1

9.35
11.2

9.4
11.25


Table 44 – Die cast holes in aluminium

 

Thread

Hole diameter

d
        min.

K
        min.

L
        min.

D2

D3

M 2,5
M 3
M 4
2,38
2,85
3,8
2,24
2,68
3,58
4,2
5
7
8,3
9,8
12,8
7,5
9
12
M 5
M 6
M 8
4,75
5,7
7,7
4,48
5,37
7,27
9
10
14
15,8
18,8
24,8
15
18
24
M 10
M 12
9,6
11,6
9,06
10,96
17
20
30,8
36,8
30
36

Some description

Tensile strength and assembly torque for case-hardened Taptite II

Thread

Min. ultimate tensile strength kN min.

Torsional strength Nm min.

Thread-forming torque Nm

Assembly torque Nm1)

M 2.5
M 3
M 4

3.15
4.68
8.17

1.2
2.1
4.9

0.8
1.4
3.4

≈0.5
≈0.8
≈2

M 5
M 6
M 8

13.2
18.7
34

10
17
42

6.6
11
28

≈4
≈7
≈17

M 10
M 12

53.9
78.4

85
150

55
94

≈30 
≈50

1) In through-hole once the thread has been pressed