RUKO KES-DIN335-HSS-90°-Ø20.5mm-ALU Countersink Bit

With a 90° cutting angle and a 20.5 mm cutting diameter, this RUKO countersink bit delivers clean, precise chamfers and deburring on a wide range of materials. The HSS-E (cobalt alloyed high-speed steel) body provides high hot hardness and wear resistance, while the ground profile ensures accurate cutting edges and smooth chip flow.

Overview

The KES-DIN335-HSS-90°-Ø20.5mm-ALU is a three-flute countersink bit conforming to DIN 335 Form C. It features a cylindrical shank with a diameter of 10 mm and an overall length of 63 mm. The tool is designed for right-hand cutting and is suitable for use on steel, stainless steel, cast iron, non-ferrous metals such as aluminum, brass, and copper, as well as plastics.

What stands out

• 90° countersink angle for standard countersunk screws
• HSS-E cobalt steel for enhanced durability and heat resistance
• Three-flute design for smooth cutting and reduced vibration
• Ground profile for precise geometry and consistent results
• Uncoated surface for universal application

Technical details

• Tool Type: Countersink
• Standard: DIN 335 Form C
• Material: HSS-E (High-Speed Steel with Cobalt)
• Cutting Angle: 90°
• Cutting Diameter (D1): 20.5 mm
• Shank Diameter (D2): 10 mm
• Overall Length (L1): 63 mm
• Number of Flutes: 3
• Shank Type: Cylindrical
• Manufacturing Process: Ground Profile
• Coating: Uncoated
• Direction of Cut: Right-hand
• Tolerance: h11

Our verdict

A dependable countersink bit for professionals who need consistent, high-quality chamfers in metal and plastic. The cobalt steel construction and precise grinding make it a solid choice for workshop or production use.