Tonnage Required for Punching Holes in Mild Steel
24
Tonnage Required for Punching Holes in Mild Steel
This table shows the tons of force required for punching round
holes in mild steel derived by the formula:
Force = hole diameter x material thickness x constant 80. All
figures shown are in U.S. tons.
For holes larger than 1 inch, the punching force can be
calculated per the following example:
What pressure is required to punch a 2-1/4" round hole in 7/8"
thick material? Since a 1" round hole in 7/8" thick material
requires 70 tons of pressure, multiply this 70 tons x 2.25 =
157.50 tons.
NOTE: Do not punch a hole with a smaller diameter than the
thickness of the material.
Material
Thickness
Punch Size
1/8 5/16 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1
3/32
1
1
2
2
3
3
4
4
5
5
5
6
7
7
8
1/8
1
2
3
3
4
4
5
6
6
7
8
8
9
9
10
3/16
3
4
5
6
7
8
9
9
10 11 12 13 14 15
1/4
5
6
8
9
10 11 13 14 15 16 18 19 20
5/16
8
9
11 13 14 16 17 19 20 22 23 25
3/8
11 13 15 17 19 21 23 24 26 28 30
7/16
15 18 20 22 24 26 28 30 33 35
1/2
20 23 25 28 30 33 35 38 40
9/16
26 28 30 34 36 40 42 45
5/8
31 34 38 41 44 47 50
11/16
38 41 44 48 51 55
3/4
45 49 53 56 60
13/16
53 57 61 65
7/8
61 66 70
15/16
71 75
1
80
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