RUKO FLS-DIN373-M-8-fein Counterbore Cutter, HSS-G, DIN 373, M8

Precision-ground HSS-G counterbore cutter for M8 hexagon socket head cap screws, conforming to DIN 373. Cutting diameter 15.0 mm, pilot diameter 9.0 mm, 3 flutes, right-hand cutting.

Overview

The RUKO FLS-DIN373-M-8-fein is a high-performance counterbore cutter manufactured from ground high-speed steel (HSS-G). It is engineered for creating flat-bottom recesses for cylindrical-head screws, particularly hexagon socket head cap screws to DIN 912 and ISO 4762. The tool features a cylindrical shank with a diameter of 10.0 mm and a total length of 71 mm.

What stands out

• Ground from solid HSS-G for high wear resistance and long tool life
• 3-flute design ensures smooth cutting and good chip evacuation
• Pilot diameter 9.0 mm precisely matches M8 clearance holes
• Bright finish reduces friction and improves corrosion resistance
• Suitable for steel, cast iron, non-ferrous metals, and plastics

Technical details

• Tool type: Counterbore cutter
• Standard: DIN 373
• Screw size compatibility: M8
• Material: HSS-G (high-speed steel, ground)
• Cutting diameter (d2): 15.0 mm
• Pilot diameter (d1): 9.0 mm
• Shank diameter (d3): 10.0 mm
• Total length (l1): 71 mm
• Cutting length (l2): 20 mm
• Number of flutes: 3
• Shank type: Cylindrical
• Cutting direction: Right-hand
• Surface finish: Bright
• Manufacturing process: Ground

Our verdict

A precision tool for professional machining, delivering accurate counterbores for M8 cap screws with excellent repeatability.