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

Solid Mushroom Universal Head Rivet - schematic
 

Small Solid Metric Rivets for General Engineering Purposes

BS 4620 : 1970   Table 3   Universal 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=0.4D

Tolerance
 

Tolerance
L

Allowance
S=0.843D

1

 0.93 /  1.07

2.0

 1.80 /  2.20

 0.4

 0.40 /  0.60

+0.5

 0.84

1.2

 1.13 /  1.27

2.4

 2.20 /  2.60

 0.5

 0.50 /  0.70

+0.5

 1.01

1.6

 1.53 /  1.67

3.2

 2.96 /  3.44

 0.6

 0.60 /  0.84

+0.5

 1.35

2

 1.93 /  2.07

4.0

 3.76 /  4.24

 0.8

 0.80 /  1.04

+0.5

 1.69

2.5

 2.43 /  2.57

5.0

 4.76 /  5.24

 1.0

 1.00 /  1.24

+0.5

 2.11

3

 2.93 /  3.07

6.0

 5.76 /  6.24

 1.2

 1.20 /  1.44

+0.5

 2.53

3.5

 3.41 /  3.59

7.0

 6.71 /  7.29

 1.4

 1.40 /  1.69

+0.5

 2.95

4

 3.91 /  4.09

8.0

 7.71 /  8.29

 1.6

 1.60 /  1.89

+0.5

 3.37

5

 4.91 /  5.09

10.0 

 9.71 / 10.29 

 2.0

 2.00 /  2.29

+0.5

 4.22

6

 5.91 /  6.09

12.0 

11.65 / 12.35 

 2.4

 2.40 /  2.75

+0.5

 5.06

7

 6.89 /  7.11

14.0 

13.65 / 14.35 

 2.8

 2.80 /  3.15

+0.8

 5.90

8

 7.89 /  8.11

16.0 

15.65 / 16.35 

 3.2

 3.20 /  3.55

+0.8

 6.74

10

 9.89 / 10.11

20.0 

19.58 / 20.42 

 4.0

 4.00 /  4.42

+0.8

 8.43

12

11.86 / 12.14 

24.0 

23.58 / 24.42 

 4.8

 4.80 /  5.22

+0.8

10.12 

14

13.86 / 14.14 

28.0 

27.58 / 28.42 

 5.6

 5.60 /  6.02

+1.0

11.80 

16

15.86 / 16.14 

32.0 

31.50 / 32.50 

 6.4

 6.40 /  6.90

+1.0

13.49 

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.