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Instructions: Input data into the blue boxes for your material and punch & die configuration. This estimates the tonnage required to complete a 90° bend.

Tensile Strength (PSI)
Material Thickness (inches) - T
Die Width (inches) - W
Punch Radius (inches)
K Factor
Die Ratio (W/T)
Bend Radius - Inside
Estimated Air Bend Radius

Bend Radius - Outside
Estimated Air Bend Radius

Minimum Between Bends
Minimum Leg Length for Die Width
Tonnage Required (per foot of Bend)
Total Tonnage for Bend
Overall Length
FT 
TONS
Constants (Press Brake Tonnage):
Bend Length (inches)
Friction Coefficient
Calculated Value of Force
Bend Angle (degrees)

DISCLAIMER: Actual bending force is affected by many factors such as friction between the material and the die, material thickness, material strength variations, rolling direction of the steel, work hardening and other parameters. This estimator calculates a force representative of the pressbrake requirement for air bending. Sizing of a machine or available die width should allow for up to 20% additional capacity. We make no guarantee of actual force required to make a bend in a specific part.

 

MATERIAL STRENGTH
ASTM
Number
Other Number
Grade
Yield Str.
Min. Tensile
Max. Tensile
Min. Rad.
Recom.
Vee Die
CARBON STEEL
  1015   29000 50000 65000    
  1020   32000 58000 73000    
  1025   34000 70000 85000    
A36     36000 58000 80000 1.5T 8T - 12T
A242 CORTEN A 50000 70000 85000 3T 12T
A283     30000 55000 60000 1.5T 8T - 10T
A514 T-1 B,F,H,Q 100000 110000 130000 3T 16T
A570   30 30000 49000 64000 1T 8T  
    33 33000 52000 67000 1T 10T  
    36 36000 53000 68000 1.5T  
    40 40000 55000 70000 2T 12T
    45 45000 60000 75000 2T  
    50 50000 65000 80000 2.5T  
    55 55000 70000 85000 3T  
A572   42 42000 60000 75000 2T 10T - 12T
    50 50000 70000 85000 2.5T 12T
    60 60000 75000 90000 3.5T 14T
    65 65000 80000 95000 4T 14T - 16T
A588 CORTEN B 50000 70000 85000 3T 10T - 12T
A606     50000 70000 85000 2.5T 8T - 12T
A607   45 45000 60000 75000 1.5T 8T - 10T
    50 50000 65000 80000 2T 10T - 12T
    55 55000 70000 85000 2T 12T
    60 60000 75000 90000 2.5T 12T - 14T
    65 65000 80000 95000 3T 14T
    70 70000 85000 100000 3.5T 16T
A611   A 25000 52000 67000 .5T  
    B 30000 45000 60000 1T  
    C 33000 48000 63000 1.5T  
    D 40000 52000 67000 2T  
    E 80000 82000 97000 NA  
A656   50 50000 60000 75000 1.5T 8T - 10T
    60 60000 70000 85000   8T - 10T
    70 70000 80000 95000   8T - 10T
    80 80000 95000 110000 1.5T 8T - 10T
A715 A606 50 50000 60000 75000 1T 10T
  A607 60 60000 70000 85000 1.5T 8T - 10T
  A607 70 70000 80000 95000 2T 10T
    80 80000 90000 105000 2T 10T - 12T
A907   30 30000 49000 64000    
    33 33000 52000 67000    
    36 36000 53000 68000    
    40 40000 55000 70000    
  AR360     177000 192000    
  AR (235)   70000 115000 130000    
  WELDEX 130 130000 147000 160000 4T  
    160 160000 181000 225000 6T  
ASTM
Number
Other Number
Grade
Yield Str.
Min. Tensile
Max. Tensile
Min. Rad.
Recom. Vee Die
STAINLESS STEEL
A167 S30215 302B 30000 75000 90000    
  S30800 308 30000 75000 90000    
  S30900 309 30000 75000 90000    
  S31000 310 30000 75000 90000    
  S33228   27000 73000 88000    
  S35315   39000 94000 109000    
A176 S32803   72000 87000 102000    
  S40300 403 30000 70000 85000    
  S42000 420   100000 115000    
  S44200 442 40000 65000 80000    
  S44600