RUKO KES-DIN335-HSS-90°-8.3mm Countersink Bit

For machinists and metalworkers who need a clean, precise chamfer on drilled holes, the RUKO KES-DIN335-HSS-90°-8.3mm countersink bit is a reliable choice in the workshop. This 3-flute tool is made from high-speed steel and ground to DIN 335 C, with a 90° cutting angle and 8.3 mm nominal diameter. It deburrs and chamfers holes in steel, cast iron, non-ferrous metals, and plastics, with a cylindrical shank of 6 mm diameter and h8 tolerance for secure chucking. Overall length is 45 mm.

Key specifications

• Tool type: Countersink
• Standard: DIN 335 C
• Material: High-speed steel (HSS)
• Cutting angle: 90°
• Nominal diameter (d1): 8.3 mm
• Shank diameter (d2): 6 mm
• Overall length (l1): 45 mm
• Number of flutes: 3
• Cutting edge type: Ground profile
• Surface treatment: Bright (uncoated)
• Cutting direction: Right-hand
• Shank tolerance: h8
• Suitable for materials: Steel, cast iron, non-ferrous metals, plastics
• Max. tensile strength of material: Up to 900 N/mm²

Why choose it

The bright, uncoated HSS body provides good wear resistance for general countersinking tasks. The 3-flute geometry promotes smooth cutting and reduces chatter, while the h8 shank tolerance ensures a precise fit in drill chucks and collets.

Ideal use cases

• Deburring drilled holes in steel and cast iron components
• Chamfering edges for screw heads or rivets
• Countersinking in non-ferrous metals and plastics

Good to know

This countersink is intended for use with a drill press or handheld drill at appropriate speeds. It is not suitable for hardened materials above 900 N/mm² tensile strength.