RUKO SPB-DIN338-15.5mm-HSSCo Twist Drill Bit, HSS-Co, 15.5 mm

Precision-ground 15.5 mm twist drill bit in HSS-Co with 5% cobalt content for high-temperature hardness and wear resistance. DIN 338 standard, type N helix, 135° split point for self-centering and reduced thrust.

Overview

The RUKO SPB-DIN338-15.5mm-HSSCo is a professional-grade twist drill bit engineered for demanding drilling in high-alloy steels, stainless steels, acid-resistant steels, heat-resistant steels, cast iron, bronze, and hard plastics. Manufactured from HSS-Co (high-speed steel with 5% cobalt), it delivers superior heat resistance and extended tool life compared to standard HSS bits. The fully ground construction ensures precise geometry and concentricity, while the bright surface finish reduces friction and improves chip flow.

What stands out

• 5% cobalt alloy for high hot hardness and wear resistance
• 135° split point eliminates walking and reduces thrust pressure
• Fully ground flutes and lands for accurate hole sizing (h8 tolerance)
• DIN 338 standard dimensions: 169 mm overall length, 114 mm working length
• Type N helix angle for general-purpose drilling in tough materials

Technical details

• Drill bit type: Twist drill bit
• Material: HSS-Co (5% cobalt)
• Standard: DIN 338
• Diameter (d1): 15.5 mm
• Total length (l1): 169 mm
• Working length (l2): 114 mm
• Shank type: Cylindrical
• Shank diameter (d2): 15.5 mm
• Point angle: 135°
• Helix angle: Type N (normal)
• Surface finish: Bright
• Manufacturing process: Fully ground
• Tolerance: h8
• Cutting direction: Right-hand cutting
• Recommended materials: High-alloy steels, stainless steels, acid-resistant steels, heat-resistant steels, cast iron, bronze, hard plastics

Our verdict

A high-performance cobalt drill bit for industrial and professional use, delivering accuracy and durability in challenging materials.