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STANDARD TAPS SPEED RECOMMENDATIONS - Industrial …
industrial-tool-supply.comtap drill sizes – sti (screw thread insert) taps aluminum steel, plastic, magnesium decimal minor dia. limits (after tapping) decimal minor dia. limits (after tapping) sti tap equiv. of tap equiv. of tap drill tap drill drill tap drill size size (inches) min. max. size (inches) min. max. 4 - 40 #31 .1200 .116 .121 #31 .1200 .119 .124