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120° Countersunk Head
Also called Flat 120° Countersunk Head Imperial Sizes
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Small Solid Imperial Rivets for General Engineering Purposes
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BS 641 : 1951 Table 7 120° Countersunk Head
Under ½ Inch Diameter - All Dimensions in Inches - All Materials
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- - - Shank Diameter - - - |
Head Diameter |
Head Depth |
Setting |
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Nominal
D |
&
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Tolerance
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A=2D |
B=0.29D |
Allowance
S=0.249D |
1/32* |
0.031 |
0.027 / 0.033 |
0.063 |
0.009 |
0.008 |
3/64* |
0.047 |
0.043 / 0.049 |
0.094 |
0.014 |
0.012 |
1/16 |
0.063 |
0.059 / 0.065 |
0.125 |
0.018 |
0.016 |
5/64* |
0.078 |
0.074 / 0.080 |
0.156 |
0.023 |
0.019 |
3/32 |
0.094 |
0.090 / 0.096 |
0.188 |
0.027 |
0.023 |
7/64* |
0.109 |
0.105 / 0.111 |
0.219 |
0.032 |
0.027 |
1/8 |
0.125 |
0.121 / 0.127 |
0.250 |
0.036 |
0.031 |
9/64* |
0.141 |
0.137 / 0.143 |
0.281 |
0.041 |
0.035 |
5/32 |
0.156 |
0.152 / 0.158 |
0.313 |
0.045 |
0.039 |
3/16 |
0.188 |
0.184 / 0.190 |
0.375 |
0.054 |
0.047 |
7/32* |
0.219 |
0.214 / 0.222 |
0.438 |
0.063 |
0.054 |
1/4 |
0.250 |
0.245 / 0.253 |
0.500 |
0.073 |
0.062 |
9/32* |
0.281 |
0.276 / 0.284 |
0.563 |
0.082 |
0.070 |
5/16 |
0.313 |
0.307 / 0.317 |
0.625 |
0.091 |
0.078 |
3/8 |
0.375 |
0.367 / 0.379 |
0.750 |
0.109 |
0.093 |
7/16 |
0.438 |
0.429 / 0.443 |
0.875 |
0.127 |
0.109 |
The Britsh Standard does not specify tolerances for Head Diameter & Depth,
Angle of Countersink or Shank Length.
It is normal to have a radius under the head and at the periphery of the countersink,
but no dimensions are specified.
*These Diameters are not specifically denoted in BS 641 Table 7.
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