Metric / Metric

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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 / Metric Punches

Tap Size Material Thickness Punch Size
M2 x .4 ALL 1.83mm
M2 x .45 ALL 2.3mm
M2.6 x .45 ALL 2.4mm
M3 x .5 ALL 2.78mm
M3.5 x .6 ALL 3.24mm
M4 x .7 ALL 3.69mm
M5 x .8 0-2.03mm 4.65mm
M5 x .8 2.28mm-3.17mm 4.7mm
M5 x .8 3.3mm-4.06mm 4.8mm

 

bulletWhen tapping stainless steels increase hole size by .02mm-.05mm on material 1.75mm 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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Last modified: March 25, 2007