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Snap or Round Head
Also called Button, Cup or Dome Head Metric Sizes
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Large Solid Metric Rivets for General Engineering Purposes
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BS 4620 : 1970 Table 2 Snap 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=1.6D |
Tolerance
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Nominal
B=0.65D |
Tolerance
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Tolerance
L |
Allowance
S=1.015D |
14 |
13.57 / 14.43 |
22 |
20.75 / 23.25 |
9.0 |
9.0 / 10.0 |
+1.0 |
14.21 |
16 |
15.57 / 16.43 |
25 |
23.75 / 26.25 |
10.0 |
10.0 / 11.0 |
+1.0 |
16.24 |
18 |
17.57 / 18.43 |
28 |
26.75 / 29.25 |
11.5 |
11.5 / 12.5 |
+1.6 |
18.27 |
20 |
19.48 / 20.52 |
32 |
30.20 / 33.80 |
13.0 |
13.0 / 14.5 |
+1.6 |
20.30 |
22 |
21.48 / 22.52 |
36 |
34.20 / 37.80 |
14.0 |
14.0 / 15.5 |
+1.6 |
22.33 |
24 |
23.48 / 24.52 |
40 |
38.20 / 41.80 |
16.0 |
16.0 / 17.5 |
+1.6 |
24.36 |
27 |
26.38 / 27.62 |
43 |
40.50 / 45.50 |
17.0 |
17.0 / 19.0 |
+3.0 |
27.41 |
30 |
29.38 / 30.62 |
48 |
45.50 / 50.50 |
19.0 |
19.0 / 21.0 |
+3.0 |
30.45 |
33 |
32.38 / 33.62 |
53 |
50.50 / 55.50 |
21.0 |
21.0 / 23.0 |
+3.0 |
33.50 |
36 |
35.38 / 36.62 |
58 |
55.00 / 61.00 |
23.0 |
23.0 / 25.5 |
+3.0 |
36.54 |
39 |
38.38 / 39.62 |
62 |
59.00 / 65.00 |
25.0 |
25.0 / 27.5 |
+3.0 |
39.59 |
There is no negative tolerance on Head Depth and Shank Length.
It is normal to have a radius under the head, but no dimensions are specified.
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