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TONNAGE TABLE Click to go to Press Brakes page Click to go to Press Brake Dies page
Approximate Pressure in Tons per Linear Foot Required to Make 90° Air Bend on Mild Steel
Width
of V-Die
Opening
Thickness of Metal
26Ga
.018"
24Ga
.024"
22Ga
.030"
20Ga
.036"
18Ga
.048"
16Ga
.060"
14Ga
.075"
13Ga
.090"
12Ga
.105"
11Ga
.120"
10Ga
.135"
9 Ga
.149"
7Ga
.187"
1/4
.250"
5/16
.313"
3/8
.375"
7/16
.437
1/2
.500"
5/8
.625"
3/4
.750"
7/8
.875"

1.00"
1/8" 1.2 2.1 3.6 Need Die Opening 10X material thickness
3/16" 0.8 1.4 4.1
1/4" 0.5 1.1 1.8 2.9 5.4
5/16" 0.7 1.4 2.2 4.0 7.0
3/8" 1.0 1.7 2.9 5.6 8.8
1/2" 1.2 2.2 3.6 10.0
5/8" 1.6 2.7 4.5 6.8 10.1
3/4" 1.3 2.2 3.4 5.4 7.4 10.5
7/8" 1.7 3.0 4.3 6.3 8.8 11.3
1" 1.4 2.5 3.7 5.4 7.2 9.6 13.1
1 1/8" 2.1 3.3 4.4 6.2 8.4 11.9 16.4
1 1/4" 1.7 2.9 4.0 5.4 7.0 9.0 14.0 28.8
1 1/2" 3.2 4.3 5.6 6.7 11.2 22.0 38.0
2" 3.2 4.1 5.2 7.6 15.3 26.0 41.0
2 1/2" 2.4 3.5 5.8 1.5 19.2 29.9 45.2
3" 2.2 4.5 9.1 16.0 24.0 35.0 47.9
3 1/2" 7.5 12.5 19.4 28.0 39.0 69.5
4" 6.2 10.6 16.0 24.0 33.1 58.0 92.0
5" 7.6 12.3 17.0 24.0 42.2 69.0 104.0
6" 9.3 14.6 19.0 32.4 52.2 80.0 112.2
7" 11.1 15.6 26.0 42.2 63.0 90.2
8" 12.7 23.0 36.0 52.5 76.0
10" 16.5 27.0 39.4 56.2
12" 21.0 31.2 44.0
Figures in color are the pressures required using a punch with a radius equal to the metal thickness and die opening approximately eight times metal thickness. This combination produces an air bend with an inside radius nearly equal to metal thickness - a good practical minimum for 90° bends.

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Note: The specifications shown on the Dreis & Krump website may change without notice