RUKO FLS-Set6tlg-TiN-f-RO Flat Counterbore Set, 6 Pieces, TiN Coated, DIN 373, Metal Cassette

This 6-piece flat counterbore set from RUKO is engineered for precision counterboring in demanding materials. The titanium nitride coating delivers a surface hardness of approximately 2300 HV, extending tool life and enabling higher cutting speeds compared to uncoated HSS tools.

Highlights

• 6-piece set covering M3 to M10 thread sizes
• TiN coating for enhanced wear resistance and reduced friction
• DIN 373 standard geometry with 3-flute design for smooth cutting
• Supplied in a robust metal cassette for organized storage

In daily use

Each counterbore features a cylindrical shank and right-hand cutting direction, suitable for use in pillar drills, milling machines, or CNC equipment. The set is ideal for creating flat-bottomed recesses for socket head cap screws in stainless steel, steel, cast iron, and non-ferrous metals.

Full specifications

• Tool Type: Flat Counterbore Set
• Number of Pieces: 6
• Material: High-Speed Steel (HSS)
• Coating: Titanium Nitride (TiN)
• Application Material: Stainless Steel, Steel, Cast Iron, Non-ferrous Metals
• Standard: DIN 373
• Shank Type: Cylindrical
• Cutting Edges: 3-flute
• Cutting Direction: Right-hand
• Counterbore Diameter (M3): Ø 6.0 mm
• Counterbore Diameter (M4): Ø 8.0 mm
• Counterbore Diameter (M5): Ø 10.0 mm
• Counterbore Diameter (M6): Ø 12.0 mm
• Counterbore Diameter (M8): Ø 16.0 mm
• Counterbore Diameter (M10): Ø 20.0 mm
• Coating Hardness: Approx. 2300 HV
• Max. Operating Temperature (Coating): Approx. 600 °C
• Packaging: Metal Cassette

Final note

With its TiN coating and DIN 373 compliance, this set provides consistent performance for professional machining tasks.