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90° Countersunk Head
Also called Flat 90° Countersunk Head Metric Sizes
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Small Solid Metric Rivets for General Engineering Purposes
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BS 4620 : 1970 Table 6 90° Countersunk Head
Up to 16 Millimetres Diameter - All Dimensions in Millimetres - All Materials
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Shank Diameter |
Head Diameter |
Head Depth |
Length |
Setting |
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Nominal
D |
Tolerance
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Nominal
A=2D |
Tolerance
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Nominal
B=0.5D |
Tolerance
L |
Allowance
S=0.667D |
1 |
0.93 / 1.07 |
2.0 |
1.60 / 2.00 |
0.5 |
+0.5 |
0.67 |
1.2 |
1.13 / 1.27 |
2.4 |
2.00 / 2.40 |
0.6 |
+0.5 |
0.80 |
1.6 |
1.53 / 1.67 |
3.2 |
2.72 / 3.20 |
0.8 |
+0.5 |
1.07 |
2 |
1.93 / 2.07 |
4.0 |
3.52 / 4.00 |
1.0 |
+0.5 |
1.33 |
2.5 |
2.43 / 2.57 |
5.0 |
4.52 / 5.00 |
1.3 |
+0.5 |
1.67 |
3 |
2.93 / 3.07 |
6.0 |
5.52 / 6.00 |
1.5 |
+0.5 |
2.00 |
3.5 |
3.41 / 3.59 |
7.0 |
6.42 / 7.00 |
1.8 |
+0.5 |
2.33 |
4 |
3.91 / 4.09 |
8.0 |
7.42 / 8.00 |
2.0 |
+0.5 |
2.67 |
5 |
4.91 / 5.09 |
10.0 |
9.42 / 10.00 |
2.5 |
+0.5 |
3.34 |
6 |
5.91 / 6.09 |
12.0 |
11.30 / 12.00 |
3.0 |
+0.5 |
4.00 |
7 |
6.89 / 7.11 |
14.0 |
13.30 / 14.00 |
3.5 |
+0.8 |
4.67 |
8 |
7.89 / 8.11 |
16.0 |
15.30 / 16.00 |
4.0 |
+0.8 |
5.34 |
10 |
9.89 / 10.11 |
20.0 |
18.70 / 20.00 |
5.0 |
+0.8 |
6.67 |
12 |
11.86 / 12.14 |
24.0 |
22.70 / 24.00 |
6.0 |
+0.8 |
8.00 |
14* |
13.86 / 14.14 |
28.0 |
26.70 / 28.00 |
7.0 |
+1.0 |
9.34 |
16* |
15.86 / 16.14 |
32.0 |
30.70 / 32.00 |
8.0 |
+1.0 |
10.67 |
The British Standard does not specify tolerances for Head Depth.
There is no positive tolerance on Head Diameter, and no negative tolerance on Shank Length.
The Countersink angle can vary between 87½° and 92½°.
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 4620 Table 6.
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