RUKO SPB-DIN338-TypUNI-HSSCo-5.50 HSS-Co Twist Drill Bit 5.5 mm DIN 338

Drilling into tough, high-alloy materials demands a bit that stays sharp and resists heat. The RUKO SPB-DIN338-TypUNI-HSSCo-5.50 is a 5.5 mm twist drill bit made from high-speed steel with 5% cobalt (HSS-Co), engineered for reliable performance in steel, stainless steel, cast iron, non-ferrous metals, and plastics.

Who is it for

This drill bit is ideal for metalworkers, machinists, and serious DIYers who frequently drill into hard steels and alloys. Its cobalt alloy and split point make it a dependable choice for precision work in demanding materials.

Main features

• 5.5 mm diameter with h8 tolerance for accurate holes
• HSS-Co material with 5% cobalt for high heat resistance and durability
• 130° split point for self-centering and reduced walking
• DIN 338 standard for consistent quality and dimensions
• Bright finish for smooth chip evacuation and corrosion resistance
• Right-hand cutting with standard spiral flute

Specifications

• Drill bit type: Twist drill bit
• Standard: DIN 338
• Material: HSS-Co (high-speed steel with cobalt)
• Cobalt content: 5%
• Diameter: 5.5 mm
• Tolerance: h8
• Point angle: 130°
• Point grind: Split point (cross-ground)
• Shank type: Cylindrical
• Cutting direction: Right-hand cutting
• Flute type: Standard spiral flute
• Surface finish: Bright
• Overall length: 93 mm
• Working length (flute length): 57 mm
• Recommended materials: Steel, stainless steel, cast iron, non-ferrous metals, plastics
• Material hardness range: Up to 1100 N/mm²
• Heat resistance: High

Tips

Use cutting fluid when drilling stainless steel or other tough alloys to extend bit life. For best results, start with a center punch or pilot hole to ensure accuracy. Store in a dry place to maintain the bright finish.