RUKO HSS-G spiraalipora ristihiottu DIN 338 7,25 mm

For metalworkers and maintenance technicians who need precise, clean holes in steel and other metals, this RUKO twist drill bit delivers reliable performance. The 7.25 mm diameter is ideal for tapping holes for M8 threads or for general-purpose drilling in workshops and on-site.

Key specifications

• Drill bit type: Twist drill bit
• Material: High-speed steel (HSS)
• Manufacturing process: Ground (HSS-G)
• Standard: DIN 338
• Diameter: 7.25 mm
• Shank type: Cylindrical
• Point type: Split point (cross ground)
• Point angle: 135°
• Helix angle: 25-30°
• Tolerance: h8
• Surface finish: Bright
• Cutting direction: Right-hand cutting
• Overall length: 109 mm
• Flute length: 69 mm
• Recommended materials: Steel, cast iron, non-ferrous metals, plastics, wood

Why choose it

The split point design reduces walking and requires less centre punching, while the ground flutes provide accurate hole sizing and efficient chip removal. Made from high-speed steel, this bit withstands the heat generated during drilling in metal.

Ideal use cases

• Drilling steel and cast iron in fabrication shops
• Creating holes for M8 taps
• General maintenance and repair work
• Drilling non-ferrous metals, plastics, and wood

Good to know

This bit conforms to DIN 338, ensuring consistent dimensions and performance. Use with a suitable cutting fluid when drilling steel to extend tool life.