Description. 20,000-rpm spindle, HSK-A63 taper, 24 hp (18 kW) integral spindle/motor drive NOTE: Speeds higher than 10,000 rpm require toolholders balanced to a G2.5 rating at a speed greater than or equal to the operational rpm. Dual-axis spindle head, with brakes on the B and C axes for rigid 3+2 machining. Price.