Tons of Pressure Required to Punch Mild Steel

Round
Hole
Diameter
(inches)		.125.188.250.312.375.437.500.562.625.687.750.813.875.9371.001.502.00
Ga.In.Force in Tons
20
18
16
14
12
11
10
3/16
1/4
5/16
3/8
1/2		.036
.048
.062
.075
.105
.120
.135
.188
.250
.312
.375
.500		 .4
.5
.6
.7
1.0
1.2
1.3
-
-
-
-
-		.5
.7
.9
1.1
1.5
1.8
2.0
2.8
-
-
-
-		.7
.9
1.2
1.5
2.1
2.4
2.6
3.7
4.9
-
-
-		.9
1.2
1.5
1.8
2.6
2.9
3.3
4.6
6.1
7.8
-
-		1.1
1.4
1.8
2.2
3.1
3.5
4.0
5.5
7.4
9.2
11.1
-		1.2
1.6
2.1
2.6
3.6
4.1
4.6
6.4
8.6
10.7
12.8
-		1.4
1.9
2.3
2.9
4.1
4.7
5.3
7.4
9.8
12.3
14.8
19.7		1.6
2.1
2.6
3.3
4.6
5.1
5.9
8.3
11.1
13.9
16.6
22.0		1.8
2.4
2.9
3.7
5.1
5.9
6.6
9.2
12.3
15.4
18.5
24.6		1.9
2.6
3.2
4.0
5.7
6.2
7.3
10.1
13.5
17.0
20.2
26.9		 2.1
2.8
3.5
4.4
6.2
7.1
7.9
11.0
14.7
18.5
22.1
29.5		2.3
3.1
3.8
4.8
6.7
7.6
8.6
12.0
16.0
20.0
23.8
31.8		2.5
3.3
4.1
5.1
7.2
8.3
9.2
12.9
17.2
21.5
25.8
34.4		2.6
3.5
4.4
5.5
7.7
8.8
9.9
13.8
18.4
23.0
27.5
36.8		2.8
3.8
4.7
5.9
8.2
9.4
10.6
14.8
19.7
24.6
29.5
39.4		4.2
5.5
7.0
8.8
12.3
14.0
15.9
22.0
34.4
43.0
51.5
68.8		5.6
7.5
9.5
11.7
16.4
18.8
21.0
29.5
39.3
49.0
59.0
78.5