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 Snap or Round Head       Reaper Rivets
  Also called Button, Cup or Dome Head           Imperial Sizes

Solid Round Head Rivet - schematic
 

Small Solid Imperial Rivets for General Engineering Purposes

BS 641 : 1951   Table 10   Snap or Round Head Reaper
Under ½ Inch Diameter - All Dimensions in Inches - All Materials

- - - Shank Diameter - - -

Head Diameter 

Head Depth

Setting

  Nominal
  D

&
 

Tolerance
 

 
   A=1.6D

 
B=0.6D

Allowance
S=0.912D

6 SWG

0.192

0.188 / 0.194

0.307

0.115

0.175

-

0.202

0.197 / 0.205

0.323

0.121

0.184

5 SWG

0.212

0.207 / 0.215

0.339

0.127

0.193

4 SWG

0.232

0.227 / 0.235

0.371

0.139

0.212

3 SWG

0.252

0.247 / 0.255

0.403

0.151

0.230
The Britsh Standard does not specify tolerances for Head Diameter, Depth, Radius or Shank Length.
It is normal to have a radius under the head, but no dimensions are specified.