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 90° Countersunk Head
  Also called Flat 90° Countersunk Head             Metric Sizes

Solid 90 degree Countersunk Head Rivet - schematic
 

Small Solid Metric Rivets for General Engineering Purposes

BS 4620 : 1970   Table 6   90° Countersunk Head
Up to 16 Millimetres Diameter - All Dimensions in Millimetres - All Materials

Shank Diameter

Head Diameter 

Head Depth

Length

Setting

  Nominal
  D

Tolerance
 

   Nominal
   A=2D

Tolerance
 

Nominal
B=0.5D

Tolerance
L

Allowance
S=0.667D

1

 0.93 /  1.07

2.0

 1.60 /  2.00

 0.5

+0.5

 0.67

1.2

 1.13 /  1.27

2.4

 2.00 /  2.40

 0.6

+0.5

 0.80

1.6

 1.53 /  1.67

3.2

 2.72 /  3.20

 0.8

+0.5

 1.07

2

 1.93 /  2.07

4.0

 3.52 /  4.00

 1.0

+0.5

 1.33

2.5

 2.43 /  2.57

5.0

 4.52 /  5.00

 1.3

+0.5

 1.67

3

 2.93 /  3.07

6.0

 5.52 /  6.00

 1.5

+0.5

 2.00

3.5

 3.41 /  3.59

7.0

 6.42 /  7.00

 1.8

+0.5

 2.33

4

 3.91 /  4.09

8.0

 7.42 /  8.00

 2.0

+0.5

 2.67

5

 4.91 /  5.09

10.0 

 9.42 / 10.00 

 2.5

+0.5

 3.34

6

 5.91 /  6.09

12.0 

11.30 / 12.00 

 3.0

+0.5

 4.00

7

 6.89 /  7.11

14.0 

13.30 / 14.00 

 3.5

+0.8

 4.67

8

 7.89 /  8.11

16.0 

15.30 / 16.00 

 4.0

+0.8

 5.34

10

 9.89 / 10.11

20.0 

18.70 / 20.00 

 5.0

+0.8

 6.67

12

11.86 / 12.14 

24.0 

22.70 / 24.00 

 6.0

+0.8

 8.00

14*

13.86 / 14.14 

28.0 

26.70 / 28.00 

 7.0

+1.0

 9.34

16*

15.86 / 16.14 

32.0 

30.70 / 32.00 

 8.0

+1.0

10.67 

The British Standard does not specify tolerances for Head Depth.
There is no positive tolerance on Head Diameter, and no negative tolerance on Shank Length.
The Countersink angle can vary between 87 and 92.
It is normal to have a radius under the head and at the periphery of the countersink,
but no dimensions are specified.
* These diameters are not specifically denoted in BS 4620 Table 6.