RUKO STB-HSS-TiAlN stupňový vrták 7/8 palca (22,2 mm) s povlakom TiAlN

The RUKO STB-HSS-TiAlN step drill bit delivers a maximum drilling diameter of 7/8 inch (22.2 mm) with a TiAlN coating for superior wear resistance. This 5-step bit starts at 14 mm and increases in 4 mm increments, making it ideal for sheet metal up to 4 mm thick.

Overview

Engineered from high-speed steel (HSS) and coated with titanium aluminum nitride (TiAlN), this step drill bit is built for demanding applications. Its spiral flute and cross-ground cutting edge ensure efficient chip removal and clean holes. The self-centering tip allows precise positioning without a pilot hole.

What stands out

• TiAlN coating reduces friction and heat buildup
• Self-centering tip for accurate starts
• Spiral flute design for smooth drilling in thin materials
• Cross-ground cutting edge for burr-free holes

Technical details

• Tool type: Step drill bit
• Material: High-speed steel (HSS)
• Coating: Titanium aluminum nitride (TiAlN)
• Maximum drilling diameter: 7/8 inch (22.2 mm)
• Minimum drilling diameter: 14 mm
• Number of steps: 5
• Step increments: 4 mm
• Shank type: Cylindrical
• Shank diameter: 10 mm
• Overall length: 75 mm
• Point angle: 118°
• Cutting direction: Right-hand cut
• Recommended material thickness: Up to 4 mm
• Self-centering tip: Yes
• Suitable materials: Sheet metal, non-ferrous metals, plastics, stainless steel
• Standard compliance: DIN 1412 C
• Flute type: Spiral flute
• Edge type: Cross-ground cutting edge

Our verdict

A versatile step drill bit for professionals who need precise, burr-free holes in thin materials. The TiAlN coating extends tool life, making it a reliable choice for stainless steel and other tough alloys.