RUKO HSS-R DIN 338 Twist Drill Bit 12.9 mm Roll-Forged

For machinists and metalworkers who demand a reliable general-purpose drill bit, the RUKO HSS-R DIN 338 twist drill bit in 12.9 mm diameter delivers consistent performance in steel, cast iron, non-ferrous metals, and hard plastics. The roll-forged high-speed steel body with black oxide finish provides a balance of toughness and wear resistance for everyday drilling tasks.

Key specifications

• Drill bit type: Twist drill bit
• Standard: DIN 338
• Material: HSS-R (High Speed Steel, roll-forged)
• Diameter: 12.9 mm
• Shank type: Cylindrical
• Shank diameter: 12.9 mm
• Overall length: 151 mm
• Flute length: 101 mm
• Point angle: 118°
• Surface treatment: Black oxide
• Cutting direction: Right-hand cutting
• Tolerance: h8
• Recommended materials: Steel (alloyed and unalloyed), cast iron, non-ferrous metals, hard plastics

Why choose it

The roll-forged construction aligns the steel's grain structure for improved strength compared to standard ground bits. The 118° point angle is a proven all-round geometry that centers well and reduces walking on a variety of materials. The black oxide finish helps retain cutting oil and provides mild corrosion resistance.

Ideal use cases

• Drilling clearance holes in structural steel
• Maintenance and repair work on machinery
• Fabrication of metal components in workshops
• Drilling hard plastics and non-ferrous metals

Good to know

This drill bit conforms to DIN 338, the German standard for short series twist drills, ensuring consistent dimensions and performance. It is sold individually and is suitable for use with standard drill chucks that accept a 12.9 mm cylindrical shank.