PK Metal Works 

 

Punching

At PK Metal Works Ltd., we have significant capabilities to offer completed products to our Shearing and Forming Customers; if you require your subcomponents with holes we have a Wide variety of punching and drilling equipment to economically service your needs. We have Iron Workers, Punch presses, Portable Magnetic drills and a Radial drill press. From Pipe protectors, Base plates to conveyor components we can service your complete value added needs. Below is a chart with the Pressure equipments to punch a hole in steel. We have a large selection of Dies from rectangles to Oblongs, Off sets to square dies and of course round dies up to 2''

Punching Machine

 Punching Machine

  

Punching Tonnage Chart for single hole punch

Tons pressure required to punch ASTM-A36

 structural steel (60,000 PSI)

Hole Diameter

Width of V Die Opening

 

1/8"

3/16"

1/4"

5/16"

3/8"

1/2"

5/8"

3/4"

7/8"

1"

1-1/8"

1-1/4"

1/8"

1.5

2.2

2.9

 

 

 

 

 

 

 

 

 

3/16"

2.2

3.3

4.4

5.5

 

 

 

 

 

 

 

 

1/4"

3

4.4

5.9

7.3

8.8

 

 

 

 

 

 

 

5/16"

3.7

5.5

7.4

9.2

11

 

 

 

 

 

 

3/8"

4.4

6.6

8.8

11

13.3

18

 

 

 

 

 

 

7/16"

5.2

7.7

10.3

12.9

16

21

 

 

 

 

 

 

1/2"

5.9

8.8

11.8

14.7

18

24

30

 

 

 

 

 

9/16"

6.7

9.9

13.2

17

20

27

33

 

 

 

 

 

5/8"

7.4

11

14.7

18

22

29

37

44

52

 

 

 

11/16"

8.1

12.1

16

20

24

32

41

49

57

65

 

 

3/4"

8.9

13.2

18

22

27

35

44

53

62

71

80

 

13/16"

9.6

14.3

19

24

29

37

48

57

67

77

86

96

7/8"

10.3

15

21

26

31

41

52

62

72

83

93

103

15/16"

11.1

17

22

28

33

44

55

66

77

88

99

111

1"

11.8

18

24

29

35

47

59

71

83

94

106

118

1-1/16"

12

19

25

31

38

50

63

75

88

100

113

125

1-1/8"

13.3

20

27

33

40

53

66

79

93

106

119

133

1-3/16"

14

21

28

35

42

56

70

84

98

112

126

140

1-1/4"

14.7

22

30

37

44

59

74

88

103

118

133

147

1-5/16"

16

23

31

39

46

62

77

93

108

124

139

155

1-3/8"

16

24

32

40

49

65

81

97

113

130

146

162

1-7/16"

17

25

34

42

51

68

85

102

119

136

153

169

1-1/2"

18

26

35

44

53

71

88

106

124

141

159

177

1-5/8"

19

29

38

48

58

77

96

115

134

153

172

192

1-3/4"

21

31

41

52

62

83

103

124

144

165

186

206

1-7/8"

22

33

44

55

66

88

111

133

155

177

199

221

2"

24

35

47

59

71

94

118

141

165

189

212

236

2-1/8"

25

38

50

63

75

100

125

150

175

200

225

250

2-1/4"

27

40

53

66

80

106

133

159

186

212

239

 

2-3/8"

28

42

56

70

84

112

140

168

196

224

 

 

2-1/2"

30

44

59

74

88

118

147

177

206

 

 

 

2-5/8"

31

46

62

77

93

124

155

186

217

 

 

 

2-3/4"

32

49

65

81

97

130

162

195

227

 

 

 

2-7/8"

34

51

68

85

102

136

169

203

 

 

 

 

3"

35

53

71

88

106

141

177

212

 

 

 

 

4"

47

71

94

118

142

189

 

 

 

 

 

 

5"

59

88

118

147

177

236

 

 

 

 

 

 

6"

71

106

142

177

212

283

 

 

 

 

 

 

Punching Chart for brake press

Tons required per hole to punch mild steel having 60,000 PSI tensile strength. (Part 1)

Hole Diameter

1/8" (.125)

3/16" (.1875)

1/4" (.250)

5/16" (.3125)

3/8" (.375)

7/16" (.4375)

1/2" (.500)

9/16" (.5625)

Metal Gauge

Thickness Inches

PRESSURE IN TONS

28

0.015

0.2

0.2

0.3

0.4

0.4

0.5

0.6

0.7

26

0.018

0.2

0.3

0.4

0.4

0.5

.06

0.7

0.8

24

0.024

0.2

0.4

0.5

0.6

0.7

0.8

0.9

1.1

22

0.030

0.3

0.4

0.6

0.7

0.9

1.0

1.2

1.3

20

0.036

0.4

0.5

0.7

0.9

1.1

1.2

1.4

1.6

18

0.048

0.5

0.7

0.9

1.2

1.4

1.6

1.9

2.1

16

0.060

0.6

0.9

1.2

1.5

1.8

2.1

2.3

2.6

14

0.075

0.7

1.1

1.5

1.8

2.2

2.6

2.9

3.3

12

0.105

1.0

1.5

2.1

2.6

3.1

3.6

4.1

4.6

11

0.120

1.2

1.8

2.4

2.9

3.5

4.1

4.7

5.1

10

0.135

1.3

2.0

2.6

3.3

4.0

4.6

5.3

5.9

5/32"

0.157

 

2.3

3.1

3.8

4.6

5.4

6.1

6.9

3/16"

0.188

 

2.8

3.7

4.6

5.5

6.4

7.4

8.3

1/4"

0.250

 

 

4.9

6.1

7.4

8.6

9.8

11.1

3/8"

0.375

 

 

 

 

11.1

12.8

14.8

16.5

1/2"

.500

 

 

 

 

 

 

19.7

22.0

 

Punching Chart for brake press

Tons required per hole to punch mild steel having 60,000 PSI tensile strength. (Part 2)

 

Hole Diameter

9/16" (.5625)

5/8" (.625)

11/16" (.6875)

3/4" (.750)

13/16" (.8125)

7/8" (.875)

7/16" (.9375)

1" (1.000)

Metal Gauge

Thickness Inches

PRESSURE IN TONS

28

0.015

0.7

0.7

0.8

0.9

1.0

1.1

1.2

1.3

26

0.018

0.8

0.9

1.0

1.1

1.1

1.2

1.3

1.4

24

0.024

1.1

1.2

1.3

1.4

1.5

1.6

1.8

1.9

22

0.030

1.3

1.5

1.6

1.8

1.9

2.1

2.2

2.4

20

0.036

1.6

1.8

1.9

2.1

2.3

2.5

2.6

2.8

18

0.048

2.1

2.4

2.6

2.8

3.1

3.3

3.5

3.8

16

0.060

2.6

2.9

3.2

3.5

3.8

4.1

4.4

4.7

14

0.075

3.3

3.7

4.0

4.4

4.8

5.1

5.5

5.9

12

0.105

4.6

5.1

5.7

6.2

6.7

7.2

7.7

8.2

11

0.120

5.1

5.9

6.2

7.1

7.6

8.3

8.8

9.4

10

0.135

5.9

6.6

7.3

7.9

8.6

9.2

9.9

10.6

5/32"

0.157

6.9

7.7

8.4

9.2

10.0

10.7

11.5

12.3

3/16"

0.188

8.3

9.2

10.4

11.0

12.0

12.9

13.8

14.8

1/4"

0.250

11.1

12.3

13.5

14.7

16.0

17.2

18.4

19.7

3/8"

0.375

16.5

18.5

20.2

22.1

23.8

25.8

27.5

29.5

1/2"

0.500

22.0

24.6

26.9

29.5

31.8

34.4

36.8

39.4

5/8"

0.625

 

30.8

33.7

36.9

39.9

43.0

46.0

49.2

3/4"

0.750

 

 

 

44.3

44.7

51.7

55.2

59.0

1"

1.000

 

 

 

 

 

 

 

60.0

 

 For smooth trouble-free, the punching tonnage should not exceed two-thirds of the rated capacity of the press. In multiple punching set-ups, the punches should be stepped by setting punches at different levels. If the punches are on two levels, the punching pressure requires may be divided by two. If they are set on three levels, the pressure may be divided by three.

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