|
90° Countersunk Head
Also called Flat 90° Countersunk Head Imperial Sizes
|
|
Small Solid Imperial Rivets for General Engineering Purposes
|
|
BS 641 : 1951 Table 6 90° Countersunk Head
Under ½ Inch Diameter - All Dimensions in Inches - All Materials
|
|
- - - Shank Diameter - - - |
Head Diameter |
Head Depth |
Setting |
|
Nominal
D |
&
|
Tolerance
|
A=2D |
B=0.5D |
Allowance
S=0.667D |
1/32* |
0.031 |
0.027 / 0.033 |
0.063 |
0.016 |
0.021 |
3/64* |
0.047 |
0.043 / 0.049 |
0.094 |
0.023 |
0.031 |
1/16 |
0.063 |
0.059 / 0.065 |
0.125 |
0.031 |
0.042 |
5/64* |
0.078 |
0.074 / 0.080 |
0.156 |
0.039 |
0.052 |
3/32 |
0.094 |
0.090 / 0.096 |
0.188 |
0.047 |
0.063 |
7/64* |
0.109 |
0.105 / 0.111 |
0.219 |
0.055 |
0.073 |
1/8 |
0.125 |
0.121 / 0.127 |
0.250 |
0.063 |
0.083 |
9/64* |
0.141 |
0.137 / 0.143 |
0.281 |
0.070 |
0.094 |
5/32 |
0.156 |
0.152 / 0.158 |
0.313 |
0.078 |
0.104 |
3/16 |
0.188 |
0.184 / 0.190 |
0.375 |
0.094 |
0.125 |
7/32* |
0.219 |
0.214 / 0.222 |
0.438 |
0.109 |
0.146 |
1/4 |
0.250 |
0.245 / 0.253 |
0.500 |
0.125 |
0.167 |
9/32* |
0.281 |
0.276 / 0.284 |
0.563 |
0.141 |
0.188 |
5/16 |
0.313 |
0.307 / 0.317 |
0.625 |
0.156 |
0.208 |
3/8 |
0.375 |
0.367 / 0.379 |
0.750 |
0.188 |
0.250 |
7/16 |
0.438 |
0.429 / 0.443 |
0.875 |
0.219 |
0.292 |
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 6.
|
|
|
