RUKO FLS-DIN373-HSS-TiN-M-5x Spot Facing Counterbore Tool

Titanium nitride coating on high-speed steel delivers a surface hardness of approximately 2300 HV for extended tool life in demanding spot facing and counterboring operations.

Overview

The RUKO FLS-DIN373-HSS-TiN-M-5x is a precision ground counterbore tool engineered for creating flat-bottom recesses for M5 screw heads. Manufactured to DIN 373 standards, it features a 3-flute design with a 5.3 mm pilot that guides the tool accurately in pre-drilled holes, ensuring concentric and clean counterbores.

What stands out

• TiN coating reduces friction and increases wear resistance, especially in steel and cast iron.
• Parallel shank with h8 tolerance ensures secure clamping in standard collets or chucks.
• Pilot diameter tolerance h11 provides smooth entry and alignment without binding.
• Right-hand cutting direction suits conventional drilling machines and CNC spindles.

Technical details

• Standard: DIN 373
• Material: High-Speed Steel (HSS)
• Coating: Titanium Nitride (TiN)
• Application: Spot facing, counterboring for screw heads
• Screw Size Compatibility: M5
• Pilot Diameter (d1): 5.3 mm
• Cutting Diameter (d2): 9.0 mm
• Shank Diameter (d3): 8.0 mm
• Overall Length (l1): 63 mm
• Pilot Length (l2): 10 mm
• Cutting Edge Length (l3): 12 mm
• Number of Flutes: 3
• Shank Type: Parallel Shank
• Cutting Direction: Right-hand cut
• Suitable for Materials: Steel, cast iron, non-ferrous metals, plastics
• Manufacturing Process: Ground profile
• Tolerance (Shank): h8
• Tolerance (Pilot): h11

Our verdict

A reliable counterbore for professionals who need accurate M5 screw head recesses in tough materials, backed by RUKO's precision grinding and TiN coating.