Bosch Professional High-Speed Steel Countersink Drill Bit 12.4 mm 90°

The Bosch Professional PRO Soft Metal HSS Countersink Drill Bit 12.4 mm is a one-piece high-speed steel countersink designed for finishing pre-drilled holes. It prepares metal parts for fastening operations by altering the existing hole profile, with its main function being to deburr rough edges left by standard drilling. The cutting action shapes the material so that subsequent screws sit flush with the workpiece surface. Installers and construction professionals typically use it when working with aluminium, copper, alloyed steel, and cast iron.

Operating the bit requires a standard rotary drill or driver. It functions only as an external power-tool accessory and cannot operate independently. The solid construction withstands the friction generated during continuous metalworking tasks. Proper setup in a compatible host tool prevents slippage and ensures consistent torque transfer during deburring. Steady rotation allows operators to achieve uniform chamfers across soft non-ferrous metals and denser non-alloy steel.

• 90° point angle cuts the precise recess geometry required for standard countersunk hardware.
• 8 mm cylindrical shank fits securely into conventional keyed and keyless rotary chucks without the need for adapters.
• Three cutting edges distribute friction evenly to reduce chatter and produce a smooth machined surface.
• 56 mm overall length keeps a compact profile for stable handling during detail work.
• Conforms to DIN 335 C for standardised tip geometry and consistent finishing results.