RUKO SPB-DIN1897-HSSCo-Ø5.5mm Twist Drill Bit

Drilling into tough materials like stainless steel or high-alloy steels quickly dulls standard bits, causing burn marks and poor hole quality. This RUKO twist drill bit solves that problem with a cobalt-alloyed HSS body that stays sharp and resists heat, even under heavy feed pressure.

Who is it for

Professional machinists and serious DIYers who need a reliable bit for hard metals, cast iron, and abrasive plastics. It is ideal for maintenance, toolmaking, and production environments where precision and tool life matter.

Main features

• 5.5 mm diameter with h8 tolerance for accurate holes
• Short series per DIN 1897 for stable, rigid drilling
• 130° split point reduces walking and requires less thrust
• Bright finish for clean chip flow and easy inspection
• Right-hand cutting, ground from solid HSS-Co (5% cobalt)

Specifications

• Drill bit type: Twist drill bit
• Standard: DIN 1897 (short series)
• Material: HSS-Co (high-speed steel with 5% cobalt)
• Diameter: 5.5 mm
• Shank type: Cylindrical (parallel shank)
• Point angle: 130°
• Point type: Split point (cross-ground)
• Surface finish: Bright
• Total length: 62 mm
• Working length (flute length): 26 mm
• Tolerance: h8
• Direction of cut: Right-hand cutting
• Recommended application: High-alloy steels, stainless steel (Inox), acid and heat-resistant steels, cast iron, bronze, hard plastics
• Manufacturing process: Ground from solid
• Heat resistance: Very high (due to cobalt content)
• Chip removal: Excellent
• Packaging quantity: 1 piece

Tips

Use a cutting fluid or coolant when drilling stainless steel to extend bit life. For deep holes, withdraw the bit periodically to clear chips and prevent binding.