Manufacture custom, application-specific tool holders and specialized cutters with Boring Bar Blanks MAS-BT Tool Holders. Engineered for machining operations requiring bespoke tool geometry on CNC equipment using MAS 403 / JIS B 6339 (BT) steep taper spindles, these blanks feature a pre-ground, fully hardened MAS-BT taper shank paired with a soft, machinable front section. This configuration allows machinists and toolmakers to turn, bore, mill, and case-harden custom tool bodies while maintaining true spindle seating accuracy.
