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Universal or Mushroom Head
Also called Brazier, Oval, or Truss Head Metric Sizes
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Small Solid Metric Rivets for General Engineering Purposes
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BS 4620 : 1970 Table 3 Universal 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=0.4D |
Tolerance
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Tolerance
L |
Allowance
S=0.843D |
1 |
0.93 / 1.07 |
2.0 |
1.80 / 2.20 |
0.4 |
0.40 / 0.60 |
+0.5 |
0.84 |
1.2 |
1.13 / 1.27 |
2.4 |
2.20 / 2.60 |
0.5 |
0.50 / 0.70 |
+0.5 |
1.01 |
1.6 |
1.53 / 1.67 |
3.2 |
2.96 / 3.44 |
0.6 |
0.60 / 0.84 |
+0.5 |
1.35 |
2 |
1.93 / 2.07 |
4.0 |
3.76 / 4.24 |
0.8 |
0.80 / 1.04 |
+0.5 |
1.69 |
2.5 |
2.43 / 2.57 |
5.0 |
4.76 / 5.24 |
1.0 |
1.00 / 1.24 |
+0.5 |
2.11 |
3 |
2.93 / 3.07 |
6.0 |
5.76 / 6.24 |
1.2 |
1.20 / 1.44 |
+0.5 |
2.53 |
3.5 |
3.41 / 3.59 |
7.0 |
6.71 / 7.29 |
1.4 |
1.40 / 1.69 |
+0.5 |
2.95 |
4 |
3.91 / 4.09 |
8.0 |
7.71 / 8.29 |
1.6 |
1.60 / 1.89 |
+0.5 |
3.37 |
5 |
4.91 / 5.09 |
10.0 |
9.71 / 10.29 |
2.0 |
2.00 / 2.29 |
+0.5 |
4.22 |
6 |
5.91 / 6.09 |
12.0 |
11.65 / 12.35 |
2.4 |
2.40 / 2.75 |
+0.5 |
5.06 |
7 |
6.89 / 7.11 |
14.0 |
13.65 / 14.35 |
2.8 |
2.80 / 3.15 |
+0.8 |
5.90 |
8 |
7.89 / 8.11 |
16.0 |
15.65 / 16.35 |
3.2 |
3.20 / 3.55 |
+0.8 |
6.74 |
10 |
9.89 / 10.11 |
20.0 |
19.58 / 20.42 |
4.0 |
4.00 / 4.42 |
+0.8 |
8.43 |
12 |
11.86 / 12.14 |
24.0 |
23.58 / 24.42 |
4.8 |
4.80 / 5.22 |
+0.8 |
10.12 |
14 |
13.86 / 14.14 |
28.0 |
27.58 / 28.42 |
5.6 |
5.60 / 6.02 |
+1.0 |
11.80 |
16 |
15.86 / 16.14 |
32.0 |
31.50 / 32.50 |
6.4 |
6.40 / 6.90 |
+1.0 |
13.49 |
There is no negative tolerance on Head Depth and Shank Length.
The Britsh Standard does not specify tolerances for Head Radii.
It is normal to have a radius under the head, but no dimensions are specified.
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