RUKO FLS-DIN373-M-6-mittel Counterbore / Spot Facer for M6 Screws, HSS-Co 5, DIN 373, 10.5 mm Pilot Diameter

Precision-ground HSS-Co 5 counterbore for M6 screws, engineered to DIN 373 with a 10.5 mm counterbore diameter and 6.4 mm pilot diameter for clean, chatter-free spot facing.

Overview

The RUKO FLS-DIN373-M-6-mittel is a cylindrical-shank counterbore (also called a spot facer) made from high-speed steel with 5% cobalt (HSS-Co 5). It is designed for creating flat-bottomed recesses for M6 hexagon socket head cap screws and similar fasteners. The tool conforms to DIN 373 and features a bright finish with a right-hand cut.

What stands out

• HSS-Co 5 material provides enhanced heat resistance and tool life compared to standard HSS.
• Ground profile ensures accurate geometry and smooth cutting action.
• Three flutes allow efficient chip evacuation in counterboring operations.
• Suitable for steel, cast iron, non-ferrous metals, and plastics.

Technical details

• Tool Type: Counterbore / Spot Facer
• Standard: DIN 373
• Material: HSS-Co 5 (High-Speed Steel with 5% Cobalt)
• Application: For M6 Screws
• Pilot Diameter (d1): 6.4 mm
• Counterbore Diameter (d2): 10.5 mm
• Shank Diameter (d3): 10 mm
• Overall Length (L): 63 mm
• Pilot Length (l1): 10 mm
• Counterbore Depth (l2): 6.6 mm
• Number of Flutes: 3
• Shank Type: Cylindrical Shank
• Surface Treatment: Bright Finish
• Cutting Direction: Right-Hand Cut
• Recommended Materials: Steel, Cast Iron, Non-Ferrous Metals, Plastics
• Manufacturing Process: Ground Profile
• Tolerance (Shank): h8
• Packaging Unit: 1 Piece

Our verdict

A reliable DIN 373 counterbore for M6 fasteners, built from cobalt-enriched HSS for demanding workshop use.