RUKO SPB-DIN338-HSSCo8-Ø4.2mm HSS-Co8 Twist Drill Bit

When drilling into tough, high-alloy steel on a busy workshop floor, this RUKO twist drill bit delivers the precision and durability professionals demand. The SPB-DIN338-HSSCo8-Ø4.2mm is a fully ground, right-hand cutting twist drill bit made from HSS-Co8, an 8% cobalt high-speed steel that withstands high temperatures and maintains hardness even under heavy loads. Its 135° split point self-centers on contact, reducing walking and eliminating the need for center punching in many applications. The bright finish and cylindrical shank ensure smooth chip evacuation and secure clamping in standard drill chucks.

Key specifications

• Drill bit type: Twist drill bit
• Material: HSS-Co8 (8% cobalt high-speed steel)
• Standard: DIN 338
• Diameter: 4.2 mm
• Total length: 75 mm
• Working length: 47 mm
• Shank type: Cylindrical
• Point angle: 135°
• Surface finish: Bright
• Flute type: Right-hand cutting
• Tolerance: h8
• Manufacturing process: Fully ground

Why choose it

The cobalt alloy provides very high heat resistance and wear resistance, making this bit ideal for drilling high-alloy steels, stainless steel, acid-resistant steel, heat-resistant steel, cast iron, and bronze. Its self-centering point and excellent chip removal keep holes accurate and clean, reducing tool wear and improving productivity.

Ideal use cases

• Drilling stainless steel and high-alloy steel components in metalworking shops
• Creating precise holes in cast iron or bronze for maintenance and repair tasks
• Production drilling where consistent hole quality and long tool life are critical

Good to know

This drill bit is sold individually and is suitable for use with standard drill chucks. For best results, use appropriate cutting fluid and recommended speeds for the material being drilled.