RUKO FLS-DIN373-HSS-TiN-M-8x Spot Facer / Countersink, M8, TiN Coated HSS

With a 15.0 mm cutting diameter and TiN coating, this RUKO spot facer delivers clean, flat seating surfaces for M8 screws and washers.

Overview

The RUKO FLS-DIN373-HSS-TiN-M-8x is a precision spot facer (also known as a counterbore) manufactured to DIN 373. It is made from high-speed steel (HSS) with a titanium nitride (TiN) coating for enhanced wear resistance and longer tool life. The tool features a 9.0 mm pilot diameter to guide it in pre-drilled holes, a 10.0 mm cylindrical shank for secure clamping, and three flutes for efficient chip removal. Overall length is 71 mm with an 18 mm pilot length.

What stands out

• TiN coating reduces friction and improves durability
• Ground flutes ensure accurate, chatter-free cutting
• Pilot diameter matches M8 clearance holes for precise alignment
• Three flutes provide a smooth finish on seating surfaces

Technical details

• Tool type: Spot facer / countersink
• Standard: DIN 373
• Material: High-speed steel (HSS)
• Coating: Titanium nitride (TiN)
• Nominal thread size: M8
• Cutting diameter (d2): 15.0 mm
• Pilot diameter (d1): 9.0 mm
• Shank diameter (d3): 10.0 mm
• Overall length (l1): 71 mm
• Pilot length (l2): 18 mm
• Number of flutes: 3
• Shank type: Cylindrical
• Application: Creating flat seating surfaces for screws (e.g., socket head cap screws, cheese head screws) and washers
• Recommended materials: Steel, cast iron, non-ferrous metals
• Manufacturing process: Ground

Our verdict

A professional-grade spot facer that combines precise geometry with a wear-resistant TiN coating, ideal for repetitive counterboring tasks in metalworking.