RUKO KES-DIN335-HSSCo-90°-8.0mm Countersink Bit

Machinists and metalworkers use this RUKO countersink bit to deburr and chamfer drilled holes in steel, cast iron, non-ferrous metals and plastics. The 90° cutting angle produces a standard countersink for flat-head screws, while the HSSCo material with cobalt provides heat resistance for longer tool life.

Key specifications

• Tool type: Countersink
• Standard: DIN 335 C
• Material: HSSCo (High-Speed Steel with Cobalt)
• Cutting angle: 90°
• Nominal diameter: 8.0 mm
• Shank diameter: 8.0 mm
• Overall length: 45 mm
• Number of flutes: 3
• Coating: Uncoated
• Direction of cut: Right-hand
• Manufacturing process: Precision ground profile

Why choose it

Precision ground flutes ensure clean, chatter-free countersinks. The cobalt alloy withstands high temperatures, making it suitable for stainless steels and tough materials. The cylindrical shank fits standard drill chucks.

Ideal use cases

• Deburring drilled holes in metalworking shops
• Chamfering edges for safe handling
• Countersinking for flat-head screws in machine assembly
• Working with steel, cast iron, non-ferrous metals and plastics

Good to know

This countersink is supplied as a single unit. It is uncoated, which allows for easy resharpening. The shank tolerance is h8 for a secure fit in precision chucks.