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How to Design Metal Stampings
Things We've Learned From Years Making Metal Stampings

6. Recommended Minimum Ratios of Punched Hole Diameters To Stock Thickness

Limitations are established in common practice for most economical production. Recommended ratios are applicable to all common metals.
P = Punched Hole Diameter (0.062 min. dia.)
T = Stock Thickness

Material
Ultimate
Tensile
Strength (PSI)		 Ratio
P to T
32,000 P=1.0T
50,000 P=1.5T
95,000 P=2.0T

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