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Socket Flat Head Screws
DIN 7991
GRADE 10.9
THREADS ISO 262
(COARSE SERIES ONLY)

All dimensions in millimeters.
*Torque calculated to induce 420 M Pa in the screw threads.
A Max. Theoretical sharp corners.
  1. Material high grade alloy steel Also available in stainless steel.
  2. Hardness Rc 38-44
  3. Tensile stress (alloy steel) 1100 M Pa.
  4. Shear stress (alloy steel) 660 M Pa.
  5. 0.2% Yield stress (alloy steel) 990 M Pa.
  6. For sizes up to and including M20, head angle shall be 92/90 degree. For larger sizes head angle shall be 62/60 degree.

DIMENSIONS

Nom

thrd

size

Pitch

A

Max

B

Max

E

Max

H

Ref

F

Max

S

Ref

T

Max

W

Max

M3

M4

M5

0.5

0.7

0.8

6.72

8.96

11.20

3

4

5

1.85

2.69

3.18

1.7

2.3

2.8

1.05

1.49

1.86

0.50

0.70

0.70

12

14

16

2

2.5

3

M6

M8

M10

1.0

1.25

1.50

13.44

17.92

22.40

6

8

10

3.58

4.42

6.01

3.3

4.4

5.5

2.16

2.85

3.60

0.85

1.20

1.50

18

22

26

4

5

6

M12

M16

1.75

2.00

26.88

33.60

12

16

6.85

8.10

6.5

7.5

4.35

4.89

1.85

1.85

30

38

8

10

M20

M24

2.50

3.00

40.32

40.42

20

24

8.70

16.05

8.5

14

5.45

10.15

1.85

2.20

46

54

12

14

APPLICATION DATA

Recommended seating torque

Hole dimensions

Plain

N-m    inch-lbs.

Cadium Plated

N-m   inch-lbs.

Tap drill size

Body drill size

1.2

2.8

5.5

11

25

50

0.9

2.0

4.5

8

17

40

2.5

3.3

4.2

3.4

4.5

5.6

9.5

24

47

85

210

415

7.0

18

35

62

160

310

5.0

6.75

8.5

6.8

8.8

10.8

82

205

725

1800

62

150

550

1325

10.25

14

12.8

17

400

640

3550

5650

300

565

2650

5000

17.5

21

21

25