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 Flat Head
  Also called Tinman Head                                    Metric Sizes

Solid Flat Head Rivet - schematic
 

Small Solid Metric Rivets for General Engineering Purposes

BS 4620 : 1970   Table 5   Flat 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

Nominal
B=0.25D

Tolerance
L

Allowance
S=D

1

 0.93 /  1.07

2.0

0.25

+0.5

 1.0

1.2

 1.13 /  1.27

2.4

 0.3

+0.5

 1.2

1.6

 1.53 /  1.67

3.2

 0.4

+0.5

 1.6

2

 1.93 /  2.07

4.0

 0.5

+0.5

 2.0

2.5

 2.43 /  2.57

5.0

 0.6

+0.5

 2.5

3

 2.93 /  3.07

6.0

 0.8

+0.5

 3.0

3.5

 3.41 /  3.59

7.0

 0.9

+0.5

 3.5

4

 3.91 /  4.09

8.0

 1.0

+0.5

 4.0

5

 4.91 /  5.09

10.0 

 1.3

+0.5

 5.0

6

 5.91 /  6.09

12.0 

 1.5

+0.5

 6.0

7

 6.89 /  7.11

14.0 

 1.8

+0.8

 7.0

8

 7.89 /  8.11

16.0 

 2.0

+0.8

 8.0

10

 9.89 / 10.11

20.0 

 2.5

+0.8

10.0 

12*

11.86 / 12.14 

24.0 

 3.0

+0.8

12.0 

14*

13.86 / 14.14 

28.0 

 3.5

+1.0

14.0 

16*

15.86 / 16.14 

32.0 

 4.0

+1.0

16.0 
The British Standard does not specify tolerances for Head Diameter & Depth.
There is no negative tolerance on Shank Length.
It is normal to have a radius under the head, but no dimensions are specified.
* These diameters are not specifically denoted in BS 4620 Table 5.