The threading inserts are available in carbide grades T10 and K20.
These two grades have an optimum combination of toughness and
wear resistance, particulary for threading operations. T10 is a micro-
grain grade that has excellent cutting edge sharpness, also on the
Both of the basic grades are available with two different coatings. The
most universal coating is designated C and is an ordinary TiN coating
that performs very well on most materials. Our new R coating is TiAlN
based and has been specially developed for threading operations.
Excellent results have been achieved, particularly in stainless steels and
other long-chip materials. This is usually the universial problemsolver.
As shown in the figure, the designations to the left describe logically
both the basic grade and the coating type.
Avoid edge build-up
Edge build-up generally causes excessively rapid wear of the cutting
edge. Edge build-up is usually due to incorrect temperature at the
cutting area, which is known as the edge build-up area. The solution
may be either to raise or lower the temperature. The coating prevents
welding of the chip to the insert and reduces friction, thus also lowering
the temperature. If this fails to solve the problem, the cutting speed
can be reset to an area outside the edge build-up area. Fewer passes
may also be a solution, since this affects the temperature.