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Tech Article #1 - Tonnage Chart For Mild Steel

by Kevin Smith

Tons of Pressure Required to Punch Mild Steel

Use this chart to make sure that your punch has enough capacity to punch through your material.

Round
Hole
Diameter
Ga.
20
18
16
14
12
11
10
3/16"
1/4"
5/16"
3/8"
1/2"
In.
.036
.048
.062
.075
.105
.120
.135
.188
.250
.312
.375
.500
1/8"
.4
.5
.6
.7
1.0
1.2
1.3
-
-
-
-
-
3/16"
.5
.7
.9
1.1
1.5
1.8
2.0
2.8
-
-
-
-
1/4"
.7
.9
1.2
1.5
2.1
2.4
2.6
3.7
4.9
-
-
-
5/16"
.9
1.2
1.5
1.8
2.6
2.9
3.3
4.6
6.1
7.8
-
-
3/8"
1.1
1.4
1.8
2.2
3.1
3.5
4.0
5.5
7.4
9.2
11.1
-
7/16"
1.2
1.6
2.1
2.6
3.6
4.1
4.6
6.4
8.6
10.7
12.8
-
1/2"
1.4
1.9
2.3
2.9
4.1
4.7
5.3
7.4
9.8
12.3
14.8
19.7
9/16"
1.6
2.1
2.6
3.3
4.6
5.1
5.9
8.3
11.1
13.9
16.5
22.0
5/8"
1.8
2.4
2.9
3.7
5.1
5.9
6.6
9.2
12.3
15.4
18.5
24.6
11/16"
1.9
2.6
3.2
4.0
5.7
6.2
7.3
10.1
13.5
17.0
20.2
26.9
3/4"
2.1
2.8
3.5
4.4
6.2
7.1
7.9
11.0
14.7
18.5
22.1
29.5
13/16"
2.3
3.1
3.8
4.8
6.7
7.6
8.6
12.0
16.0
20.0
23.8
31.8
7/8"
2.5
3.3
4.1
5.1
7.2
8.3
9.2
12.9
17.2
21.5
25.8
34.4
15/16"
2.6
3.5
4.4
5.5
7.7
8.8
9.9
13.8
18.4
23.0
27.5
36.8
1"
2.8
3.8
4.7
5.9
8.2
9.4
10.6
14.8
19.7
24.6
29.5
39.4
1 1/2"
4.2
5.5
7.0
8.8
12.3
14.0
25.9
22.0
34.4
43.0
51.5
68.8
2"
5.6
7.5
9.5
11.7
16.4
18.8
21.0
29.5
39.3
49.0
59.0
78.5
2 1/2"
7.0
9.4
11.7
14.7
20.5
23.5
26.5
36.8
49.0
61.5
73.6
98.2
3"
8.5
11.3
14.0
17.6
24.5
28.2
31.7
44.2
60.0
76.5
88.4
118.0
3 1/2"
9.9
13.0
16.5
20.5
28.8
32.7
37.0
51.5
68.7
86.0
103.0
137.0
4"
11.3
15.0
18.8
23.5
32.8
37.6
42.2
60.0
78.5
98.0
188.0
157.0

This article was published on Tuesday 20 March, 2007.
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