What hole saw is best for tapping ductile iron?
We carry three models of cutters that can tap ductile iron.
The H model, fine carbide tipped, can perform about 3-5 taps on D.I. pipe.
The Tiger model, heavy carbide tipped, can perform taps into all types of steel pipes with about a dozen taps on ductile.
The D.I. model is dedicated only for ductile iron taps and can perform up to a couple dozen taps through ductile iron pipe.