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 Universal or Mushroom Head
  Also called Brazier, Oval, or Truss Head           Metric Sizes

Solid Universal Mushroom Head Rivet - schematic
 

Large Solid Metric Rivets for General Engineering Purposes

BS 4620 : 1970   Table 4   Universal Head
14 to 39 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=04D

Tolerance
 

Tolerance
L

Allowance
S=0.843D

14

13.57 / 14.43

28

26.20 / 29.80

5.6

 5.6 / 6.3

+1.0

11.80

16

15.57 / 16.43

32

30.20 / 33.80

6.4 

6.4 / 7.1

+1.0

13.49

18

17.57 / 18.43

36

34.20 / 37.80

7.2 

7.2 / 7.9

+1.6

15.17

20

19.48 / 20.52

40

37.50 / 42.50

8.0 

8.0 / 8.9

+1.6

16.86

22

21.48 / 22.52

44

41.50 / 46.50

8.8 

8.8 / 9.7

+1.6

18.55

24

23.48 / 24.52

48

45.50 / 50.50

9.6 

9.6 / 10.5 

+1.6

20.23

27

26.38 / 27.62

54

51.00 / 57.00

10.8 

10.8 / 12.1 

+3.0

22.76

30

29.38 / 30.62

60

57.00 / 63.00

12.0 

12.0 / 13.3 

+3.0

25.29

33

32.38 / 33.62

66

63.00 / 69.00

13.2 

13.2 / 14.5 

+3.0

27.82

36

35.38 / 36.62

72

68.00 / 76.00

14.4 

14.4 / 16.0 

+3.0

30.35

39

38.38 / 39.62

78

74.00 / 82.00

15.6 

15.6 / 17.2 

+3.0

32.88

There is no negative tolerance on Head Depth and Shank Length.
The Britsh Standard does not specify tolerances for Head Radii.
It is normal to have a radius under the head, but no dimensions are specified.