Type B. Less, formed, ceramic bound, aluminium oxide mounted points, with 3 mm spindle.

Norton Quantum (NQ).Mounted points with NQ abrasives give at least 33% longer life in combination with more than 30% higher removal than mounted bits of aluminium oxide. Extremely free-cutting, which gives minimal heat development.

86A Mounted points of aluminium oxide for wide general usage.

The max. permitted speeds for mounted points with 13 mm free spindle lengths are stated in the table. Free spindle length is the distance from the abrasive body to the chuck.