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17
9.3.2 Punch and Die
Operating Clearances
Maintain the following clearances between punch
and die.
Material Thickness
Total Clearance
16 gauge and lighter
.006”
15 gauge - 13 gauge
.010”
3/32” - 5/32”
1/64”
3/16” - 15/32”
1/32”
1/2” - 23/32”
1/16”
3/4” and heavier
3/32”
Table 3
Punch Capacities
You can determine the tonnage required to punch
A36 mild steel (yield strength 36,300 psi, 65,000
psi tensile) by applying the following formulas for
roundor shaped holes. For materials other than
mild steelplease refer to the multiplier table.
Table 5 - Punch Tonnage Requirements
Round Holes
Punch Dia. x Material Thickness x 80 = Tons of
pressure required
Example: How many tons of force do I need to
punch a 3/8” hole in 1/4” mild steel?
.375 x .25 x 80 = 7.5 tons
Shaped Holes
1/3 Punch Perimeter x Material thickness x 80 =
Tons of pressure required
Example: How much force do I need to punch a
3/8”x 1” rectangular hole in 1/4” mild steel?
(.33 x 2.75) x .25 x 80 = 18.1 tons
Material Multiplier
When punching materials other than mild steel
first calculate tonnage as shown above then
apply the multiplier for the listed material.
Aluminum (2024-0)
0.36
Brass (1/4 hard)
0.70
Copper (1/2 hard)
0.52
Steel (50% carbon)
1.60
Steel (cold rolled) (1018)
1.24
Stainless Steel (303)
1.50
Table 4
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