5mm x 57mm Carbide Tipped Boring Bit — 60° Point, Left-Hand

Description

The BBT055L is a carbide tipped boring bit — 5mm diameter, 57mm overall length, 60-degree tip angle — in left-hand rotation. Boring bits in this size and format are used on CNC multi-spindle boring machines in cabinet and furniture production: the machine bores multiple holes simultaneously in panel components for shelf pin holes, hinge hardware locations, and connector fittings. Left-hand boring bits rotate counterclockwise (when viewed from the shank end) and are typically alternated with right-hand bits across the machine’s boring head to balance cutting forces and reduce vibration. The 60-degree tip geometry is the standard point angle for boring into melamine-faced MDF and particleboard — producing a clean entry hole without face tear-out. At 57mm length, BBT055L fits machines with standard clearance requirements. For longer reach in the same 5mm size, see BBT057L (70mm). For brad point tip geometry (BBP series), see BBP055L. For 8mm diameter, see BBT085L.