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 Pan Head Type 1             Boiler Rivets
  Also called Cone Head                                     Imperial Sizes

Large Boiler Pan Head Type 1 Rivet - schematic
 

Large Solid Imperial Boiler Rivets

BS 425 : 1943   Fig 5   Pan Head Type 1
½ to 2 Inches Diameter - All Dimensions in Inches - Mild Steel

- - - Shank Diameter - - -

Depth of 

Head Diameter 

Head Depth

Setting

  Nominal
  D

&
 

Tolerance
 

 60° Fillet
 E=0.125D

 
   A=1.6D

 
B=0.7D

Allowance
S=1.223D

1/2

0.500

0.484 / 0.516

0.063

0.800

0.350

0.612

17/32

0.531

0.516 / 0.547

0.066

0.850

0.372

0.650

9/16

0.563

0.547 / 0.578

0.070

0.900

0.394

0.688

19/32

0.594

0.578 / 0.609

0.074

0.950

0.416

0.726

5/8

0.625

0.609 / 0.641

0.078

1.000

0.438

0.764

21/32

0.656

0.641 / 0.672

0.082

1.050

0.459

0.803

11/16

0.688

0.672 / 0.703

0.086

1.100

0.481

0.841

23/32

0.719

0.703 / 0.734

0.090

1.150

0.503

0.879

3/4

0.750

0.734 / 0.766

0.094

1.200

0.525

0.917

13/16

0.813

0.797 / 0.828

0.102

1.300

0.569

0.994

7/8

0.875

0.859 / 0.891

0.109

1.400

0.613

1.070

15/16

0.938

0.922 / 0.953

0.117

1.500

0.656

1.147

1

1.000

0.984 / 1.016

0.125

1.600

0.700

1.223

1.1/8

1.125

1.109 / 1.156

0.141

1.800

0.788

1.376

1.1/4

1.250

1.234 / 1.281

0.156

2.000

0.875

1.529

1.3/8

1.375

1.359 / 1.406

0.172

2.200

0.963

1.682

1.1/2

1.500

1.484 / 1.531

0.188

2.400

1.050

1.835

1.5/8

1.625

1.609 / 1.656

0.203

2.600

1.138

1.987

1.3/4

1.750

1.734 / 1.781

0.219

2.800

1.225

2.140

1.7/8

1.875

1.859 / 1.906

0.234

3.000

1.313

2.293

2

2.000

1.984 / 2.031

0.250

3.200

1.400

2.446

The Britsh Standard allows an upward tolerance of 1/64 inch for Fillet Depth, Head Diameter & Depth.
No tolerances are specified for Fillet Angle or Shank Length.
It is normal to have a radius under the head, but no dimensions are specified.
BS 425 refers to "60° Fillet" as "cone chamfer under the head".