RUKO FLS DIN 373 HSS TiN M5 Countersink Drill Bit, 9.0 mm Countersink Diameter, 5.3 mm Pilot Diameter, 90° Angle

Precision-ground HSS countersink with TiN coating, engineered for M5 threads. The 90° angle and 9.0 mm countersink diameter deliver clean chamfers in steel, cast iron, non-ferrous metals, plastics, and wood.

Overview

The RUKO FLS-DIN373-HSS-TiN-M-5x is a DIN 373 countersink drill bit made from high-speed steel with a titanium nitride coating. It features a 5.3 mm pilot diameter to guide the tool in pre-drilled holes for M5 screws, ensuring concentric countersinks. The 6.0 mm cylindrical shank fits standard drill chucks.

What stands out

• TiN coating increases surface hardness and reduces friction for longer tool life.
• Three flutes provide smooth cutting and good chip evacuation.
• Ground cutting edges ensure precise countersink geometry.
• Right-hand cutting direction suits standard drilling machines and hand drills.

Technical details

• Standard: DIN 373
• Material: High-speed steel (HSS)
• Coating: Titanium nitride (TiN)
• Countersink diameter (d1): 9.0 mm
• Pilot diameter (d2): 5.3 mm
• Shank diameter (d3): 6.0 mm
• Overall length (l1): 50 mm
• Pilot length (l2): 10 mm
• Countersink angle: 90°
• Number of flutes: 3
• Cutting direction: Right-hand
• Shank type: Cylindrical
• Manufacturing process: Ground

Our verdict

A reliable DIN 373 countersink for M5 applications, combining HSS toughness with a TiN coating for improved wear resistance. Ideal for workshop and industrial use where consistent chamfers are required.