06.Knock Out Holes & K.O. Extension

1.Used as the clearance holes for K.O. retainer/coupling.
2.the location and size of knockout holes for Inch Mold:

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3.the location and size of knockout holes for Metric Mold:

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4.The screw for K.O. retainer(1/2-13UNC or 5/8-11UNC.) should be machinined per the following  diagram unless otherwise specified for Inch mold:

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5.The screw for K.O. retainer(M16) should be machinined per the following  diagram unless otherwise specified for Metric mold:

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6.The mistakes that the beginners often makes was shown below:

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