Sapphire Products Logo
Click for Homepage  Incorporating
The Rivet Supply Company
 Sapphire  Products  Limited
 Unit  E3  Ivanhoe  Business  Park
 Tom  Bill  Way,   Smisby Road,
 Ashby de la Zouch,   LE65  2UY
 Tel :  0121  326  6000       or       0121  327  4868
 Fax : 0121  328  5518
Sapphire Crystal Logo
Click for homepage
 Snap or Round Head
  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 1   Snap or Round Head
Under ½ Inch Diameter - All Dimensions in Inches - All Materials

- - - Shank Diameter - - -

Head Diameter 

Head Depth

Setting

  Nominal
  D

&
 

Tolerance
 

 
   A=1.75D

 
B=0.75D

Allowance
S=1.429D

1/32*

0.031

0.027 / 0.033

0.055

0.023

0.045

3/64*

0.047

0.043 / 0.049

0.082

0.035

0.067

1/16*

0.063

0.059 / 0.065

0.109

0.047

0.089

5/64*

0.078

0.074 / 0.080

0.137

0.059

0.112

3/32

0.094

0.090 / 0.096

0.164

0.070

0.134

7/64*

0.109

0.105 / 0.111

0.191

0.082

0.156

1/8*

0.125

0.121 / 0.127

0.219

0.094

0.179

9/64*

0.141

0.137 / 0.143

0.246

0.105

0.201

5/32*

0.156

0.152 / 0.158

0.273

0.117

0.223

3/16

0.188

0.184 / 0.190

0.328

0.141

0.268

7/32*

0.219

0.214 / 0.222

0.383

0.164

0.313

1/4

0.250

0.245 / 0.253

0.438

0.188

0.357

9/32*

0.281

0.276 / 0.284

0.492

0.211

0.402

5/16

0.313

0.307 / 0.317

0.547

0.234

0.447

3/8

0.375

0.367 / 0.379

0.656

0.281

0.536

7/16

0.438

0.429 / 0.443

0.766

0.328

0.625

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.
*These Diameters are not specifically denoted in BS 641 Table 1.