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Universal or Mushroom Head
Also called Brazier, Oval, or Truss Head Metric Sizes
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Large Solid Metric Rivets for General Engineering Purposes
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BS 4620 : 1970 Table 4 Universal Head
14 to 39 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=04D |
Tolerance
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Tolerance
L |
Allowance
S=0.843D |
14 |
13.57 / 14.43 |
28 |
26.20 / 29.80 |
5.6 |
5.6 / 6.3 |
+1.0 |
11.80 |
16 |
15.57 / 16.43 |
32 |
30.20 / 33.80 |
6.4 |
6.4 / 7.1 |
+1.0 |
13.49 |
18 |
17.57 / 18.43 |
36 |
34.20 / 37.80 |
7.2 |
7.2 / 7.9 |
+1.6 |
15.17 |
20 |
19.48 / 20.52 |
40 |
37.50 / 42.50 |
8.0 |
8.0 / 8.9 |
+1.6 |
16.86 |
22 |
21.48 / 22.52 |
44 |
41.50 / 46.50 |
8.8 |
8.8 / 9.7 |
+1.6 |
18.55 |
24 |
23.48 / 24.52 |
48 |
45.50 / 50.50 |
9.6 |
9.6 / 10.5 |
+1.6 |
20.23 |
27 |
26.38 / 27.62 |
54 |
51.00 / 57.00 |
10.8 |
10.8 / 12.1 |
+3.0 |
22.76 |
30 |
29.38 / 30.62 |
60 |
57.00 / 63.00 |
12.0 |
12.0 / 13.3 |
+3.0 |
25.29 |
33 |
32.38 / 33.62 |
66 |
63.00 / 69.00 |
13.2 |
13.2 / 14.5 |
+3.0 |
27.82 |
36 |
35.38 / 36.62 |
72 |
68.00 / 76.00 |
14.4 |
14.4 / 16.0 |
+3.0 |
30.35 |
39 |
38.38 / 39.62 |
78 |
74.00 / 82.00 |
15.6 |
15.6 / 17.2 |
+3.0 |
32.88 |
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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