Punch and Die Set Up Tips
 Tool life is all about SET-UP!
- Is everything tight?
- Is punch to die alignment good?
- Is the punch to die clearance correct for material thickness?
Standard die size is punch size plus 1/32 or 1/16.
Reference Chart for Mild Steel |
Material Thickness |
Total Clearance |
1/4 to 1/2 |
1/32 |
1/2 to 3/4 |
1/16 |
3/4 to 1 |
3/32 |
- Is stripper adjusted correctly?
- Are all safety guards in place?
- See “Punch Tips”
To Calculate Tonnage
(For material with 65,000 psi tensile)
Round
Hole Size X Material Thickness X 102 = Tonnage |
|
Oblong
[ (.63 X Z) + “W”] X Material Thickness X 102 = Tonnage |
 |
Square
A X 1.27 X Material Thickness X 102 = Tonnage |
 |
Rectangle
(L + W) X .64 X Material Thickness X 102 = Tonnage |
 |
FOR HIGHER TENSILE MATERIAL, EXCHANGE 102 WITH:
75,000 psi TENSILE = 118
85,000 psi TENSILE = 134
READ AND UNDERSTAND THIS WARNING. PROTECT YOURSELF AND OTHERS.
Extreme pressures are generated. Use all safety guards. It is the responsibility of the user to operate the machine and tooling in accordance with OSHA Laws and ANSI B11.5 Safety Standards.
TYPICAL DIE CLEARANCES FOR MILD STEEL
PUNCH
SIZE |
MATERIAL THICKNESS |
1/8 |
1/4 |
3/8 |
1/2 |
5/8 |
3/4 |
7/8 |
1" |
3/16 |
13/64 |
|
|
|
|
|
|
|
1/4 |
17/64 |
|
|
|
|
|
|
|
5/16 |
21/64 |
11/32 |
|
|
|
|
|
|
3/8 |
25/64 |
13/32 |
|
|
|
|
|
|
7/16 |
29/64 |
15/32 |
15/32 |
|
|
|
|
|
1/2 |
33/64 |
17/32 |
17/32 |
|
|
|
|
|
9/16 |
37/64 |
19/32 |
19/32 |
5/8 |
|
|
|
|
5/8 |
41/64 |
21/32 |
21/32 |
11/16 |
|
|
|
|
11/16 |
45/64 |
23/32 |
23/32 |
3/4 |
3/4 |
|
|
|
3/4 |
49/64 |
25/32 |
25/32 |
13/16 |
13/16 |
|
|
|
13/16 |
53/64 |
27/32 |
27/32 |
7/8 |
7/8 |
7/8 |
|
|
7/8 |
57/64 |
29/32 |
29/32 |
15/16 |
15/16 |
15/16 |
|
|
15/16 |
61/64 |
31/32 |
31/32 |
1" |
1" |
1" |
1-1/32 |
|
1" |
1-1/64 |
1-1/32 |
1-1/32 |
1-1/16 |
1-1/16 |
1-1/16 |
1-3/32 |
1-3/32 |
1-1/16 |
1-5/64 |
1-3/32 |
1-3/32 |
1-1/8 |
1-1/8 |
1-1/8 |
1-5/32 |
1-5/32 |
1-1/8 |
1-9/64 |
1-5/32 |
1-5/32 |
1-3/16 |
1-3/16 |
1-3/16 |
1-7/32 |
1-7/32 |
1-3/16 |
1-13/64 |
1-7/32 |
1-7/32 |
1-1/4 |
1-1/4 |
1-1/4 |
1-9/32 |
1-9/32 |
1-1/4 |
1-17/64 |
1-9/32 |
1-9/32 |
1-5/16 |
1-5/16 |
1-5/16 |
1-11/32 |
1-11/32 |
1-5/16 |
1-21/64 |
1-11/32 |
1-11/32 |
1-3/8 |
1-3/8 |
1-3/8 |
1-13/32 |
1-13/32 |
1-3/8 |
1-25/64 |
1-13/32 |
1-13/2 |
1-7/16 |
1-7/16 |
1-7/16 |
1-15/32 |
1-15/32 |
1-7/16 |
1-29/64 |
1-15/32 |
1-15/32 |
1-1/2 |
1-1/2 |
1-1/2 |
1-17/32 |
1-17/32 |
1-1/2 |
1-33/64 |
1-17/32 |
1-17/32 |
1-9/16 |
1-9/16 |
1-9/16 |
1-19/32 |
1-19/32 |
THIS CHART IS FOR REFERENCE ONLY
Check with machine manufacturer for specific applications.
REFERENCE TONNAGE CHART
MATERIAL
THICKNESS |
PUNCH SIZE |
3/16 |
1/4 |
5/16 |
3/8 |
7/16 |
1/2 |
9/16 |
5/8 |
11/16 |
3/4 |
13/16 |
7/8 |
15/16 |
1" |
1-1/8 |
1-1/4 |
3/16 |
.187 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
17 |
19 |
1/4 |
.250 |
|
5 |
6 |
8 |
9 |
10 |
11 |
13 |
14 |
15 |
16 |
18 |
19 |
20 |
23 |
25 |
3/8 |
.375 |
|
|
|
11 |
13 |
15 |
17 |
19 |
21 |
23 |
24 |
26 |
28 |
30 |
33 |
38 |
1/2 |
.500 |
|
|
|
|
|
20 |
23 |
25 |
28 |
30 |
33 |
35 |
38 |
40 |
45 |
50 |
5/8 |
.625 |
|
|
|
|
|
|
|
31 |
34 |
38 |
41 |
44 |
47 |
50 |
56 |
63 |
3/4 |
.750 |
|
|
|
|
|
|
|
|
|
45 |
49 |
53 |
56 |
60 |
68 |
75 |
7/8 |
.875 |
|
|
|
|
|
|
|
|
|
|
|
61 |
66 |
70 |
78 |
88 |
1" |
1.000 |
|
|
|
|
|
|
|
|
|
|
|
|
|
80 |
90 |
100 |
This chart provides the required tonnage to punch a hole through mild steel with a tensil stregth of 50,000 psi. There are many variables that affect the punching process, including required tonnage. Therefore, this chart is an approximation and is to be used as a guide only.
For specific mahine capacities, please refer to your machine manual.
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