Tonnage Table
Pressure Table-Tonnage Chart for Press Brake Tooling.  CLICK FOR HOMEPAGE.

Press Brake Tonnage Table
Approximate pressure in Tons per Linear Foot Required to Make 90 Air Bend on Mild Steel (without fully bottoming the top die into the bottom die)

Click for chart of tensile strengths for aluminum and stainless steel to compare with mild steel.
Click for a Bend Radius Chart for aluminum and stainless steel for recommended minimum bend radii.

Highlighted Figures are the pressures required using a punch with a radius equal to the metal thickness and die opening approximately 8X metal thickness. This combination produces an air bend with an inside radius nearly equal to metal thickness-a good practical minimum for 90 bends. Buying wider Dies may increase the capacity of the Press Brake as shown on the chart. The disadvantage of using wider dies is that the minimum size flange you can bend up becomes larger and so does the inside radius.
EXAMPLES:
Question: How many tons is required for a brake press machine to bend 10 feet of 1/4 inch thick mild steel using a standard 2 inch wide bottom die?
Answer: 15.3 tons/foot x 10 feet = 153 tons. Therefore a 175 tons would be a good minimum size brake press machine if you are making more than just a few parts.
Question: How could you bend some 1/4 inch thick steel if you already own a 120 ton size press brake?
Answer: Use a 2-1/2 inch wide bottom die. 11.5 tons/foot x 10 feet = 115 tons.
Question: How many tons is required for a brake press machine to bend 10 feet of 1/4 inch thick stainless steel using using a 2 1/2 inch wide bottom die?
Answer: 115 tons x 90ksi divided by 60ksi = 177.5 tons
(using information from our Tensile Srengths webpage)

Call 773-334-5000 if you want help from one of our sales engineers.

Click to our Chicago Dreis & Krump Press Brake Page

Click to see our selection of Press Brake Dies

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"
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 11.5 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

 

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