Press Brake Bending Chart
 
Tons required per foot to bend mild steel having max.60,000 PSI tensile strength and max. 36,000 PSI yield strength.
 
Metal Thickness
Width of V Die Opening
Gauge Inches 1/4" 5/16" 3/8"  7/16" 1/2" 5/8" 3/4" 7/8" 1" 1-1/8" 1-1/4" 1-1/2"
20
0.036
3.1
2.3
1.7
1.4
1.1
18
0.048
5.3
4.0
3.0
2.5
2.2
1.7
1.3
16
0.060
9.6
7.1
5.6
4.5
3.8
2.8
2.2
1.8
1.5
14
0.075
11.9
9.2
7.6
6.3
4.7
3.5
3.0
2.5
2.1
1.8
12
0.105
16.7
13.1
9.7
8.0
6.5
5.6
4.6
4.1
3.2
11
0.120
19.2
14.2
11.1
9.0
7.5
6.3
5.5
4.4
10
0.135
18.6
14.5
11.9
9.9
8.5
7.3
5.8
3/16"
0.188
27.4
23.1
19.3
16.4
14.3
11.2
1/4"
0.250
39.4
33.3
29.5
22.7
5/16"
0.313
50.4
39.8
3/8"
0.375
61.6
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Metal Thickness
Width of V Die Opening
Gauge Inches 2" 2-1/2" 3" 3-1/2" 4" 5" 6" 7" 8" 10" 12"
11
0.120
2.9
10
0.135
4.0
3/16"
0.188
7.5
5.7
4.4
1/4"
0.250
15.4
11.4
9.0
7.4
6.1
5/16"
0.313
27.0
19.7
15.3
12.7
10.5
7.7
3/8"
0.375
42.3
30.9
24.0
19.6
16.3
12.3
9.5
7/16"
0.438
61.7
45.8
35.4
28.6
24.4
17.3
14.8
11.2
1/2"
0.500
63.6
48.8
39.7
33.3
24.6
19.4
15.9
13.1
5/8"
0.625
86.2
70.0
58.3
43.1
33.3
27.4
23.3
16.9
3/4"
0.750
110.0
93.0
68.7
53.5
43.6
36.5
27.1
21.0
7/8"
0.875
137.0
104.0
80.7
64.6
52.9
39.7
31.6
1"
1.000
143.0
113.0
91.2
76.2
56.3
44.2
The tonnages indicated in gray boxes are for die openings 8 times the thickness of metal up to 1/4". The tonnages indicated in rust boxes are for die openings 10 times the thickness of metal above 1/4".

The inside radius of a right angle bend is approximately equal to the thickness of the material. Bending pressures for other metals, as compared to mild steel on chart, are as follows: Soft brass - 50% of pressure shown; soft aluminum - 50% of pressure shown; aluminum alloys heat-treated - same as steel; stainless steel - 50% more than steel; chrome molybdenum - 100% more than steel.

All of the above bending pressures are nominal and represent average conditions. These values are dependent upon the radii of the dies, the yield strength of the material, the temper of the material, the direction of the rolling strains, etc. 

THEREFORE A SAFETY FACTOR OF AT LEAST 20% SHOULD BE PROVIDED IN SELECTING A PRESS FOR A GIVEN JOB.
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Fax:      248-442-0807
e-mail:superior@sudetco.com
 

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