NCT3.5 Metric

      Home
News
Support
Helpful Links
Products
Services
Distributors

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.

***********************************

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

************************************

Metric Thread / American Punches

Tap Size Material Thickness Punch Size
M6 x 1.0 0-.09 .219
M6 x 1.0 .1-.25 .221-.223
M8 x 1.25 0-.09 .293
M8 x 1.25 .1-.25 .295-.298

Metric Thread / Metric Punches

Tap Size Material Thickness Punch Size
M6 x 1.0 0-2.28mm 5.52mm
M6 x 1.0 2.54mm-6.35mm 5.61mm-5.66mm
M8 x 1.25 0-2.28mm 7.44mm
M8 x 1.25 2.54mm-6.35mm 7.49mm-7.56mm

 

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.

 

Send mail to derek@dktech.net with questions or comments about this web site.
Copyright © 2002 d/k technologies
Last modified: March 25, 2007