PUNCH TONNAGE CHART

METAL TYPE

MULTIPLIER

Tonnage requirement
for other than
mild steel
(60,000 Pound Shear Strength)
Aluminum (2024-0) .36 
Brass (1/4 Hard) .70 
Copper (1/2 Hard) .52 
Steel (50% Carbon) 1.60 
Steel Cold Drawn (1018) 1.24 
Stainless Steel (303) 1.50 

 

TONNAGE REQUIRED TO PUNCH ROUND HOLES
in ASTM A-36 Structural Steel

Round Hole Diameter
METAL THICKNESS
1/8" 1/4" 3/8" 1/2" 5/8" 3/4" 7/8" 1" 1-1/8" 1-1/4"
1/8"
1/4"
3/8"
1/2"
5/8"
3/4"
7/8"
1"
1-1/8"
1-1/4"
1-3/8"
1-1/2"
1-5/8"
1-3/4"
2"
2-1/4"
2-1/2"
2-3/4"
3"
1.5 --- --- --- --- --- --- --- --- ---
3 5.9 --- --- --- --- --- --- --- ---
4.4 8.8 13.3 --- --- --- --- --- --- ---
5.9 11.8 17.7 23.6 29.5 --- --- --- --- ---
7.4 14.7 22.1 29.4 37.0 44.2 --- --- --- ---
8.9 17.7 26.5 35.3 44.2 53.0 62.0 --- --- ---
10.3 20.6 31.0 41.2 51.5 62.0 72.2 82.5 --- ---
11.8 23.6 35.3 47.1 59.0 70.7 82.5 94.3 106.0 ---
13.3 26.5 39.7 52.9 66.2 79.4 92.7 106.0 119.0 132.5
14.7 29.5 44.2 58.9 73.7 88.4 103.2 117.9 132.6 147.3
16.2 32.4 48.6 64.8 81.0 97.2 113.4 129.6 145.8 162.0
17.7 35.3 53.0 70.6 88.3 106.0 123.6 141.3 159.0 176.7
19.2 38.3 57.5 76.6 95.7 114.9 134.0 153.2 172.3 191.5
20.6 41.2 61.9 82.5 103.1 123.7 144.3 164.9 185.6 206.2
23.5 47.1 70.7 94.3 117.8 141.4 164.9 188.5 212.1 235.6
26.5 53.0 79.5 106.0 132.5 159.0 185.6 212.1 238.6 ---
29.5 58.9 88.4 117.8 147.3 --- --- --- --- ---
32.4 64.8 97.2 129.6 --- --- --- --- --- ---
35.4 70.7 106.0 141.4 --- --- --- --- --- ---