Cleveland C44635 Cobalt M42 Rectangular Tool Bit 856

Cleveland Cobalt M42 Rectangular Tool Bit

This Cleveland Cobalt M42 rectangular tool bit is a lathe tool blank made from cobalt high-speed steel for general-purpose machining. It suits machinists and maintenance technicians who need a durable blank for grinding custom cutting tools. The M42 cobalt grade provides good hot hardness and wear resistance in steel and alloy work.

For custom tool grinding, not ready-to-use cutting

This blank suits users who grind their own lathe tool profiles for turning, facing or boring operations. It is not for buyers who need a pre-ground, indexable insert or a finished tool with a specific chip-breaker geometry. Shops without tool-grinding equipment should look at ready-made cutting tools instead.

M42 cobalt grade for hot hardness

The single specification that decides fit is the M42 cobalt high-speed steel grade, which delivers the hot hardness and wear resistance required for machining steels and tough alloys. If the application demands a different substrate such as carbide or a lower cobalt grade, this blank will not meet the requirement.