RUKO SPB-DIN338-7.4mm-HSSCo broca helicoidal

Machinists and metalworkers rely on the RUKO SPB-DIN338-7.4mm-HSSCo twist drill bit for precise, efficient drilling in tough materials. Its 5% cobalt high-speed steel construction and split point grind deliver clean starts and long life in production environments.

Key specifications

• Diameter: 7.4 mm
• Material: HSS-Co5 (5% cobalt high-speed steel)
• Standard: DIN 338
• Point angle: 135°
• Point grind: Split point (cross-ground)
• Shank: Cylindrical, 7.4 mm diameter
• Overall length: 115 mm
• Working length: 75 mm
• Surface finish: Bright
• Cutting direction: Right-hand
• Tolerance: h8
• Suitable for: Alloyed and unalloyed steel, cast iron, non-ferrous metals, plastics

Why choose it

The split point tip self-centers, reducing walking and eliminating the need for center punching. Cobalt alloying provides high heat resistance, allowing the bit to maintain hardness at elevated temperatures and drill materials up to 1100 N/mm² tensile strength.

Ideal use cases

• Drilling stainless and high-strength steels
• Maintenance and repair work on machinery
• Fabrication of metal components
• Precision drilling in cast iron and non-ferrous metals

Good to know

Fully ground flutes ensure excellent chip evacuation and accurate hole sizing. The bright finish reduces friction and resists corrosion in normal workshop conditions.