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Punch Tonnage Charts  

TONNAGE REQUIRED TO PUNCH ROUND HOLES
in ASTM A-36 Structural Steel

Round Hole Diameter

METAL THICKNESS
1/8"

1/4"

3/8"

1/2"

5/8"

3/4"

7/8"

1"

1-1/8"

1-1/4"

1/8"

1.5

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1/4"

3

5.9

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3/8"

4.4

8.8

13.3

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1/2"

5.9

11.8

17.7

23.6

29.5

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5/8"

7.4

14.7

22.1

29.4

37.0

44.2

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3/4"

8.9

17.7

26.5

35.3

44.2

53.0

62.0

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7/8"

10.3

20.6

31.0

41.2

51.5

62.0

72.2

82.5

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1"

11.8

23.6

35.3

47.1

59.0

70.7

82.5

94.3

106.0

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1-1/8"

13.3

26.5

39.7

52.9

66.2

79.4

92.7

106.0

119.0

132.5

1-1/4"

14.7

29.5

44.2

58.9

73.7

88.4

103.2

117.9

132.6

147.3

1-3/8"

16.2

32.4

48.6

64.8

81.0

97.2

113.4

129.6

145.8

162.0

1-1/2"

17.7

35.3

53.0

70.6

88.3

106.0

123.6

141.3

159.0

176.7

1-5/8"

19.2

38.3

57.5

76.6

95.7

114.9

134.0

153.2

172.3

191.5

1-3/4"

20.6

41.2

61.9

82.5

103.1

123.7

144.3

164.9

185.6

206.2

2"

23.5

47.1

70.7

94.3

117.8

141.4

164.9

188.5

212.1

235.6

2-1/4"

26.5

53.0

79.5

106.0

132.5

159.0

185.6

212.1

238.6

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2-1/2"

29.5

58.9

88.4

117.8

147.3

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2-3/4"

32.4

64.8

97.2

129.6

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3"

35.4

70.7

106.0

141.4

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Tonnage requirement
for other than mild steel
(60,000 Pound Shear Strength)

METAL TYPE

MULTIPLIER

Aluminum (2024-0)
.36
Brass (1/4 Hard)

.70

Copper (1/2 Hard)

.52

Steel (50% Carbon)

1.60

Steel Cold Drawn (1018)

1.24

Stainless Steel (303)

1.50

Puma 80/750

WARNING: It is the user’s responsibility that the machine and tooling is set-up and used in accordance with local and national OSHA laws and ANSI B11.5 standards for safety.

WARNING: NEVER try to use punches with a smaller diameter than the thickness of the material that is going to be punched.

 
   

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