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Snap or Round Head Boiler Rivets
Also called Button, Cup or Dome Head Imperial Sizes
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Large Solid Imperial Boiler Rivets
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BS 425 : 1943 Fig 3 Snap Head
½ to 2 Inches Diameter - All Dimensions in Inches - Mild Steel
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- - - Shank Diameter - - - |
Depth of |
Head Diameter |
Head Depth |
Setting |
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Nominal
D |
&
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Tolerance
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60° Fillet
E=0.125D |
A=1.6D |
B=0.7D |
Allowance
S=1.143D |
1/2 |
0.500 |
0.484 / 0.516 |
0.063 |
0.800 |
0.350 |
0.572 |
17/32 |
0.531 |
0.516 / 0.547 |
0.066 |
0.850 |
0.372 |
0.607 |
9/16 |
0.563 |
0.547 / 0.578 |
0.070 |
0.900 |
0.394 |
0.643 |
19/32 |
0.594 |
0.578 / 0.609 |
0.074 |
0.950 |
0.416 |
0.679 |
5/8 |
0.625 |
0.609 / 0.641 |
0.078 |
1.000 |
0.438 |
0.714 |
21/32 |
0.656 |
0.641 / 0.672 |
0.082 |
1.050 |
0.459 |
0.750 |
11/16 |
0.688 |
0.672 / 0.703 |
0.086 |
1.100 |
0.481 |
0.786 |
23/32 |
0.719 |
0.703 / 0.734 |
0.090 |
1.150 |
0.503 |
0.822 |
3/4 |
0.750 |
0.734 / 0.766 |
0.094 |
1.200 |
0.525 |
0.857 |
13/16 |
0.813 |
0.797 / 0.828 |
0.102 |
1.300 |
0.569 |
0.929 |
7/8 |
0.875 |
0.859 / 0.891 |
0.109 |
1.400 |
0.613 |
1.000 |
15/16 |
0.938 |
0.922 / 0.953 |
0.117 |
1.500 |
0.656 |
1.072 |
1 |
1.000 |
0.984 / 1.016 |
0.125 |
1.600 |
0.700 |
1.143 |
1.1/8 |
1.125 |
1.109 / 1.156 |
0.141 |
1.800 |
0.788 |
1.286 |
1.1/4 |
1.250 |
1.234 / 1.281 |
0.156 |
2.000 |
0.875 |
1.429 |
1.3/8 |
1.375 |
1.359 / 1.406 |
0.172 |
2.200 |
0.963 |
1.572 |
1.1/2 |
1.500 |
1.484 / 1.531 |
0.188 |
2.400 |
1.050 |
1.715 |
1.5/8 |
1.625 |
1.609 / 1.656 |
0.203 |
2.600 |
1.138 |
1.857 |
1.3/4 |
1.750 |
1.734 / 1.781 |
0.219 |
2.800 |
1.225 |
2.000 |
1.7/8 |
1.875 |
1.859 / 1.906 |
0.234 |
3.000 |
1.313 |
2.143 |
2 |
2.000 |
1.984 / 2.031 |
0.250 |
3.200 |
1.400 |
2.286 |
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".
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