TPGN 322 POSITIVE CERAMIC INSERTTPGN 322 POSITIVE CERAMIC INSERT 105800, 10 PER BOX, 1/32" CORNER RADIUS, 3/8" I.C., BLACK GRADE FOR CUTTING 55-Rc AND ABOVE MATERIAL, CHILLED CAST IRON This ceramic insert is our black ceramic grade for cutting high temperature metals with a 55-Rc and above hardness, chilled cast iron and powdered metal. This ceramic insert has replaced some grinding operations in hardened steel in the 60-62 Rc range. And as with all ceramic inserts, they are recommended for continous turning only.
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