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Charts -- Bending

Tonnages required for bending mild steel (with tensile strength of 60,000 psi)

Thickness of metal

Width of female die opening (inch)

Gauge

Inch

3/8

5/8

7/8

1

1

1

2

2

3

3

4

5

6

7

8

10

12

14

16

20
18
16

0.036
0.048
0.060

3.1
5.4
9.6

1.8
3.1
5.5

1.2
2.1
3.8


1.6
2.8


1.3
2.2



1.8



1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14
12
11

0.075
0.105
0.120

 

9.3
21

6.4
14
19

4.7
10
14

3.8
8.1
11

3.1
6.6
8.8

2.5
5.6
7.4

1.9
4.1
5.6


3.2
4.3


2.2
2.9



2.2

 

 

 

 

 

 

 

 

 

 

 

10
3/16''
1/4''

0.135
0.188
0.250

 

 

25

17
35

15
27
58

12
23
47

9.9
19
40

7.3
14
29

5.7
11
23

3.8
7.5
16

2.9
5.6
12

2.3
4.3
8.9


3.5
7.6



6.1



4.5

 

 

 

 

 

 

 

5/16''
3/8''
7/16''

0.313
0.375
0.438

 

 

 

 

 

 

70

51
75
115

40
59
90

27
40
61

20
30
46

16
24
36

13
19
29

11
16
24

7.8
12
18

6.1
9.2
14

5.0
7.5
12


6.2
9.4


4.6
6.9



5.4

 

 

1/2''
5/8''
3/4''

0.500
0.625
0.750

 

 

 

 

 

 

 

 

 

85

62

45
86

40
69
108

33
58
91

25
43
67

20
34
53

16
28
43

13
24
37

9.8
18
27

7.5
14
21

6.1
12
17


9.4
15

Tonnages given above are for air bends.  The figures printed in red are for die openings eight times the thickness of the metal.  These are used for average work, and the inside radius formed is approximately equal to the thickness or the metal.  Bending tonnage required varies directly with tensile strenght of the material.

Multipliers for computing bending tonnages of other matrerials

Aluminum :
-
Soft : 0.25
- Hard half : 0.35
- Hard sheet : 0.50
Brass :
- Soft sheet : 0.80
- Half hard : 1.00
- Hard sheet : 1.40
Duralumin :
- Soft sheet : 0.60
- Treated : 0.90
- Treated & cold rolled : 1.25

Bronze :
- Phosphore soft sheet : 0.75
Copper :
- Rolled : 0.60
Iron :
- Wrought : 0.85
Monel metal :
- Rolled sheet : 1.60
Tin :
- Sheet : 0.08

 

Steel :
- S.A.E. 1040 : 1.50
- S.A.E. 2330 : 1.75
- S.A.E. 3240 : 1.75
- 0.50 carbon : 1.60
- 0.75 carbon : 1.90
- 1.00 carbon : 2.20
- 1.20 carbon : 2.50
- Stainless
(low in carbon): 1.30
- Stainless 18.8 : 1.60

Decimal equivalents of fractions

1/64 - 0.0156
1/32 - 0.0312
3/64 - 0.0469
1/16 - 0.0625
5/64 - 0.0781
3/32 - 0.0937
7/64 - 0.1094
1/8 - 0.1250
9/64 - 0.1406
5/32 - 0.1562
11/64 - 0.1719
3/16 - 0.1875
13/64 - 0.2031
7/32 - 0.2187
15/64 - 0.2344
- 0.2500
17/64 - 0.2656
9/32 - 0.2812
19/64 - 0.2969
5/16 - 0.3125
21/64 - 0.3281
11/32 - 0.3437
23/64 - 0.3594
3/8 - 0.3750
25/64 - 0.3906
13/32 - 0.4062
27/64 - 0.4219
7/16 - 0.4375
29/64 - 0.4531
15/32 - 0.4687
31/64 - 0.4844
- 0.5000
33/64 - 0.5156
17/32 - 0.5312
35/64 - 0.5469
9/16 - 0.5625
37/64 - 0.5781
19/32 - 0.5937
39/64 - 0.6094
5/8 - 0.6250
41/64 - 0.6406
21/32 - 0.6562
43/64 - 0.6719
11/16 - 0.6875
45/64 - 0.7031
23/32 - 0.7187
47/64 - 0.7344
- 0.7500
49/64 - 0.7656
25/32 - 0.7812
51/64 - 0.7969
13/16 - 0.8125
53/64 - 0.8281
27/32 - 0.8437
55/64 - 0.8594
7/8 - 0.8750
57/64 - 0.8906
29/32 - 0.9062
59/64 - 0.9219
15/16 - 0.9375
61/64 - 0.9531
31/32 - 0.9687
63/64 - 0.9844
1 - 1.0000

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