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DIN 963:1990 Countersunk Head Slotted Screw

DIN 963:1990 Countersunk Head Slotted Screw combines a slotted drive with a countersunk head, making it suitable for fastening points that require reliable clamping, removable maintenance, and standardized assembly. The DIN standard background helps keep dimensional requirements clear across drawings, purchasing, and quality inspection, supporting smooth alignment between engineering drawings, purchasing lists, and quality inspection.

From an assembly perspective, the slot is easy to identify and works with simple tools, which supports routine maintenance and manual assembly. At the same time, the tapered head seats into a prepared countersink, allowing the screw to sit flush or nearly flush with the surface, so the screw can provide stable fastening performance across different sheet thicknesses, appearance requirements, and space limitations.

It works well on flat surfaces, rails, covers, module housings, and areas where snagging or interference should be avoided. For exposed equipment positions, head forming quality, recess integrity, edge chamfering, and coating uniformity can be emphasized so fastening performance aligns with the finished product appearance.

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Dimensions unit: mm

Thread size d

M1

M1.2

M1.4

M1.6

M2

M2.5

M3

(M3.5)

M4

P

Pitch

0.25

0.25

0.3

0.35

0.4

0.45

0.5

0.6

0.7

a

Max.

0.5

0.5

0.6

0.7

0.8

0.9

1

1.2

1.4

dk

Max.=Nominal

1.9

2.3

2.6

3

3.8

4.7

5.6

6.5

7.5

Min.

1.76

2.06

2.46

2.86

3.5

4.4

5.3

6.14

7.14

k

Max.

0.6

0.72

0.84

0.96

1.2

1.5

1.65

1.93

2.2

n

Max.

0.45

0.5

0.5

0.6

0.7

0.8

1

1

1.2

Min.

0.31

0.36

0.36

0.46

0.56

0.66

0.86

0.86

1.06

r

Max.

0.1

0.12

0.14

0.16

0.2

0.25

0.3

0.35

0.4

t

Max.

0.3

0.35

0.4

0.45

0.6

0.7

0.85

1

1.1

Min.

0.2

0.25

0.28

0.32

0.4

0.5

0.6

0.7

0.8

x

Max.

-

-

-

0.9

1

1.1

1.25

1.5

1.75

Thousand pieces of steel weigh ≈kg

 

-

-

-

-

-

-

-

-

-

Thread length b 

Min.

-

-

-

-

-

-

-

-

-

 

Thread size d

M5

M6

M8

M10

M12

(M14)

M16

(M18)

M20

P

Pitch

0.8

1

1.25

1.5

1.75

2

2

2.5

2.5

a

Max.

1.6

2

2.5

3

3.5

4

4

5

5

dk

Max.=Nominal

9.2

11

14.5

18

22

25

29

33

36

Min.

8.84

10.57

14.07

17.57

21.48

24.48

28.48

32.38

35.38

k

Max.

2.5

3

4

5

6

7

8

9

10

n

Max.

1.51

1.91

2.31

2.81

3.31

3.31

4.37

4.37

5.37

Min.

1.26

1.66

2.06

2.56

3.06

3.06

4.07

4.07

5.07

r

Max.

0.5

0.6

0.8

1

1.2

1.4

1.6

1.8

2

t

Max.

1.3

1.6

2.1

2.6

3

3.5

4

4.5

5

Min.

1

1.2

1.6

2

2.4

2.8

3.2

3.6

4

x

Max.

2

2.5

3.2

3.8

4.4

5

5

6.3

6.3

Thousand pieces of steel weigh ≈kg

 

-

-

-

-

-

-

-

-

-

Thread length b 

Min.

-

-

-

-

-

-

-

-

-

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