RUKO SPB-DIN338 4,4mm HSS-Co spiraalboor

The RUKO SPB-DIN338 4.4mm HSS-Co twist drill bit is built for demanding drilling in hard materials where standard HSS bits fail. Its 5% cobalt alloy and fully ground flutes deliver high heat resistance and precise holes in stainless and acid-resistant steels.

Highlights

• DIN 338 twist drill bit with 4.4 mm diameter
• HSS-Co (5% cobalt) for high hardness and wear resistance
• 135° split point for self-centering and reduced walking
• Right-hand cutting, cylindrical shank, tolerance h8
• Bright bronze-tinted finish for chip flow and corrosion resistance

In daily use

Ideal for professional and industrial drilling in stainless steel, alloyed steel, cast iron, and non-ferrous metals up to 1100 N/mm². The split point starts on contact without a center punch, while the fully ground flutes clear chips efficiently for fast, accurate holes.

Full specifications

• Drill bit type: Twist drill bit
• Standard: DIN 338
• Material: HSS-Co (5% cobalt)
• Diameter: 4.4 mm
• Total length: 84 mm
• Flute length: 47 mm
• Shank: Cylindrical (straight)
• Point angle: 135°
• Point type: Split point
• Cutting direction: Right-hand
• Manufacturing: Fully ground
• Tolerance: h8
• Surface finish: Bright / self-colour (bronze tint)
• Recommended materials: Stainless steel, acid-resistant steel, heat-resistant steel, alloyed steel, cast iron, non-ferrous metals
• Hardness suitability: Up to 1100 N/mm²
• Application: Industrial, professional, general purpose drilling of hard materials
• Number of pieces: 1
• Packaging: Individual

Final note

Precision-ground cobalt steel ensures long tool life and consistent hole quality in tough materials.