RUKO FLS-DIN373-mittel-M-20-MK3 HSS Counterbore, M20, Morse Taper MK3

With a 30 mm counterbore diameter and M20 thread, this RUKO counterbore creates precise recesses for cylindrical head screws in steel, cast iron, and non-ferrous metals.

Overview

The RUKO FLS-DIN373-mittel-M-20-MK3 is a pilot-guided counterbore manufactured to DIN 373. It features a Morse Taper shank size MK3 for secure tool holding and a medium length designation for balanced reach and rigidity. The tool is made from high-speed steel (HSS) with a bright, uncoated finish and is ground for accurate cutting edges.

What stands out

• Pilot-guided design ensures concentric counterbores
• 3 flutes provide efficient chip evacuation
• Right-hand cutting direction for standard machining
• Ground HSS construction for durability and sharpness

Technical details

• Standard: DIN 373
• Screw Thread Size: M20
• Shank Type: Morse Taper, Size MK3 (MT3)
• Shank Diameter: 23.825 mm
• Counterbore Diameter: 30 mm
• Pilot Diameter: 21 mm
• Overall Length: 160 mm
• Cutting Length: 35 mm
• Number of Flutes: 3
• Cutting Material: High-Speed Steel (HSS)
• Finish: Bright (Uncoated)
• Cutting Direction: Right-hand

Our verdict

A reliable counterbore for creating precise recesses in common engineering materials, with a standard Morse Taper shank for compatibility with a wide range of machine tools.