CCMT09T308 Steel Grade Used in boring bar for boring applicationDescription. CCMT-21.51 carbide insert is a 80° diamond with a 7° relief. The center hole is a 40°-60° single countersink, and a single-sided chipbreaker. It has an inscribed circle (IC) of 0.25" (1/4"), a thickness of 0.094" (3/32"), and a corner (nose) radius of 0.0156" (1/64").
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