RUKO KES-DIN335-HSSCo5-90°-Ø28.0mm Countersink Bit, HSS-Co5, 90°, 28 mm Cutting Diameter, 12 mm Shank, DIN 335 C

This countersink bit stands out with its 90° cutting angle and 28 mm cutting diameter, engineered for precise chamfering, deburring, and countersinking in demanding materials. Made from HSS-Co5 high-speed steel with 5% cobalt, it offers enhanced heat resistance and durability compared to standard HSS tools, making it suitable for stainless steel and other tough alloys.

Highlights

• 90° cutting angle for standard countersunk screws
• 28 mm cutting diameter for large holes
• HSS-Co5 (5% cobalt) for high wear resistance
• Three flutes for smooth cutting and good chip evacuation
• Cylindrical shank with h8 tolerance for secure chucking

In daily use

Designed for machine use in drilling and milling machines, this countersink produces clean, chatter-free chamfers in steel, stainless steel, cast iron, non-ferrous metals, and plastics. The bright, uncoated surface reduces friction and allows for easy resharpening, extending tool life in production environments.

Full specifications

• Tool Type: Countersink
• Standard: DIN 335 C
• Material: HSS-Co5 (High-Speed Steel with 5% Cobalt)
• Cutting Angle: 90°
• Cutting Diameter (D1): 28.0 mm
• Shank Diameter (D2): 12.0 mm
• Overall Length (L1): 71 mm
• Flute Length (L2): 28 mm
• Number of Flutes: 3
• Shank Type: Cylindrical
• Surface Treatment: Bright / Uncoated
• Application: Countersinking, Deburring, Chamfering
• Suitable for Materials: Steel, Stainless Steel, Cast Iron, Non-Ferrous Metals, Plastics
• Manufacturing Method: Ground from solid
• Direction of Cut: Right-hand cutting
• Shank Tolerance: h8
• Product Form: Type C (according to DIN 335)
• Recommended Use: Machine use (e.g., drilling machines, milling machines)
• Edge Type: Sharp cutting edges

Final note

Precision-ground from solid HSS-Co5, this countersink delivers reliable performance in industrial applications where accuracy and tool life matter.