Metric / American

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Prior to utilizing the NCT3 a pre-hole must be punched. You must always tap in the same sequence in which you pre-punched.

This chart is based on 65% - 70% thread engagement.

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Warning- Do not exceed .002 smaller pre-hole size than required. Serious tool damage may result.

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Metric Thread / American Punches

Tap Size Material Thickness Punch Size
M2 x .4 ALL .072
M2 x .45 ALL .091
M2.6 x .45 ALL .094
M3 x .5 ALL .110
M3.5 x .6 ALL .127
M4 x .7 ALL .145
M5 x .8 0-.08 .183
M5 x .8 .09-.125 .186
M5 x .8 .13-.16 .187

 

bulletWhen tapping stainless steels increase hole size by .001 -.002 on material .07 and thicker.
bulletA smaller H or D factor tap may be needed if tapped hole is too loose. Please see Tap Factor page for further explanation.
bulletIf tapping extrusions prehole is determined by material thickness not thickness of extruded hole.

 

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Copyright © 2002 d/k technologies
Last modified: March 25, 2007