RUKO SPB-DIN338-25/64-HSSCo HSS-Co Twist Drill Bit 25/64 inch (9.92 mm) DIN 338

Precision-ground HSS-Co twist drill bit with 5% cobalt, 135° split point and DIN 338 geometry for high-performance drilling in tough materials.

Overview

The RUKO SPB-DIN338-25/64-HSSCo is a fully ground twist drill bit made from high-speed steel with 5% cobalt (HSS-Co). It features a 25/64 inch (9.92 mm) diameter, cylindrical shank, and a 135° split point for self-centering and reduced thrust. The bright/steam tempered surface finish enhances durability and chip evacuation. Suitable for alloyed and unalloyed steel up to 1100 N/mm², cast iron, non-ferrous metals, and plastics.

What stands out

• 5% cobalt HSS-Co for high heat resistance and extended tool life
• 135° split point eliminates walking and provides accurate starts
• Fully ground flutes ensure precise hole quality and efficient chip removal
• DIN 338 standard dimensions: 133 mm overall length, 87 mm flute length
• Right-hand cutting, h8 shank tolerance for secure chuck grip

Technical details

• Drill bit type: Twist drill bit
• Material: High-speed steel with cobalt (HSS-Co)
• Cobalt content: 5%
• Standard: DIN 338
• Drill diameter: 25/64 inch (9.92 mm)
• Shank type: Cylindrical
• Shank diameter: 9.92 mm
• Point angle: 135°
• Point type: Split point (cross ground)
• Flute type: Right-hand spiral
• Surface finish: Bright / steam tempered
• Manufacturing process: Fully ground
• Tolerance: h8
• Cutting direction: Right-hand cutting
• Overall length (l1): 133 mm
• Flute length (l2): 87 mm
• Recommended materials: Steel (alloyed/unalloyed), cast iron, non-ferrous metals, plastics
• Max material tensile strength: Up to 1100 N/mm²
• Heat resistance: High
• Self-centering: Yes

Our verdict

A professional-grade HSS-Co twist drill bit that delivers precise, reliable holes in demanding materials. The 5% cobalt and split point design make it a top choice for workshops and industrial applications.