Series 1（Deep）

Series 2（Shallow）

Cross groove H

Cross groove Z

Cross groove H

Cross groove Z

Depth^②

m

Reference

Depth^②

m

Reference

Depth^②

m

Reference

Depth^②

m

Reference

min

max

min

max

min

max

min

max

M1.6

/

0

0.6

0.9

1.6

0.7

0.95

1.6

/

/

/

/

/

/

M2

/

0

0.9

1.2

1.9

0.95

1.2

1.9

0.9

1.2

1.9

0.95

1.2

1.9

/

ST2.2

0

0.9

1.2

1.9

0.95

1.2

2

/

/

/

/

/

/

M2.5

/

1

1.4

1.8

2.9

1.48

1.73

2.8

1.25

1.55

2.7

1.22

1.47

2.5

M3

ST2.9

1

1.7

2.1

3.2

1.76

2.01

3

1.4

1.8

2.9

1.48

1.73

2.8

M3.5

ST3.5

2

1.9

2.4

4.4

1.75

2.2

4.1

1.6

2.1

4.1

1.61

2.05

4

M4

ST4.2

2

2.1

2.6

4.6

2.05

2.51

4.4

2.1

2.6

4.6

2.06

2.51

4.4

M5

ST4.8

2

2.7

3.2

5.2

2.6

3.05

4.9

2.3

2.8

4.8

2.27

2.72

4.6

/

ST5.5

3

2.8

3.3

6.6

2.73

3.18

6.3

/

/

/

/

/

/

M6

ST6.3

3

3

3.5

6.8

3

3.45

6.6

2.8

3.3

6.6

2.73

3.18

6.3

M8

ST8

4

4

4.6

8.9

4.15

4.6

8.8

3.9

4.4

8.7

3.87

4.32

8.5

M10

ST9.5

4

5.1

5.7

10

5.19

5.64

9.8

4.8

5.3

9.6

4.78

5.23

9.4

Scope of application^③

Screws without shoulders under the head: self-tapping screws, wood screws, 4.8 grade screws.

Screws with shoulders under the head: 8.8 grade and 9.8 grade screws, self-tapping and self-cutting screws, self-tapping locking screws.

Screws without shoulders under the head: Grade 8.8 screws, self-tapping locking screws, self-tapping self-cutting screws (all should be heat-treated).