Choosing the right carbide insert grade is as important as choosing the tool geometry.
For small-diameter boring and internal grooving, three common grades appear in modern catalogs: TA61, TD61 and M6.
Each is tuned for a different workpiece family.<br>
TA61 is a general-purpose coated carbide grade suited to steel and alloy steel at moderate cutting speeds. It balances wear resistance and toughness, making it a safe default for mixed production.
TD61 leans toward higher hardness and heat resistance, performing well on stainless steel and difficult-to-cut alloys where edge temperature is the limiting factor. M6 is typically selected for cast iron and non-ferrous work where abrasion, not heat, drives insert wear.<br>
The practical rule is simple: match the grade to the dominant material in your shop. Running stainless steel on a grade tuned for cast iron shortens tool life and degrades surface finish.
When in doubt, start with TA61 for steel and TD61 for stainless, then adjust by reading the wear pattern on the edge.<br>
For boring bars with long overhang, grade choice also interacts with stability. A tougher grade tolerates the micro-vibration of deep boring better than a brittle high-hardness grade. Pair the correct grade with rigid tooling such as the BM07 or LSC carbide boring families to get predictable, repeatable results.<br>
CUTOUTIL TOOLS supplies compatible carbide inserts and boring tools with application guidance, helping buyers select the right grade, geometry and parameters for their workpiece.
