RUKO HSS-Co 10.0 mm Twist Drill Bit, 152 mm Length, DIN 338, 135° Split Point, Cobalt Alloy for Stainless Steel

The RUKO LOS-HSSCo-152mm is a fully ground HSS-Co5 twist drill bit engineered for demanding metalworking tasks where heat resistance and precision matter. Unlike standard HSS bits, its 5% cobalt alloy maintains hardness at high temperatures, making it suitable for stainless steel, alloyed steel, and acid-resistant steel. The 135° self-centering split point reduces walking and eliminates the need for center punching, while the bright uncoated finish promotes efficient chip evacuation. With a 10.0 mm diameter, 152 mm total length, and 101 mm working length, this DIN 338 bit fits standard cylindrical chucks and delivers reliable performance in workshop or industrial settings.

Highlights

• HSS-Co5 cobalt alloy for high heat resistance and durability
• 135° split point for self-centering and reduced thrust
• Fully ground flutes for smooth chip removal
• Bright uncoated surface for clean cuts in tough metals
• DIN 338 standard, right-hand cutting, h8 shank tolerance

In daily use

This twist drill bit excels when drilling stainless steel, alloyed steel, cast iron, and non-ferrous metals. Its cylindrical 10.0 mm shank fits standard drill chucks, and the 101 mm working length provides ample reach for most applications. The self-centering point allows accurate hole starts without a pilot drill, saving time on layout. For best results, use appropriate cutting fluid and moderate speed to preserve the cobalt edge.

Full specifications

• Drill Bit Type: Twist drill bit
• Material: HSS-Co5 (High-Speed Steel with 5% Cobalt)
• Drill Bit Diameter: 10.0 mm
• Total Length: 152 mm
• Working Length: 101 mm
• Shank Type: Cylindrical
• Shank Diameter: 10.0 mm
• Point Angle: 135°
• Standard: DIN 338
• Manufacturing Process: Fully Ground
• Cutting Direction: Right-hand cut
• Tolerance: h8
• Surface Finish: Bright (Uncoated)
• Number of Pieces: 1

Final note

RUKO's cobalt drill bits are trusted by professionals for high-alloy steels and stainless applications. This 152 mm length variant offers a balance of reach and rigidity for precise, long-lasting performance.