RUKO LOS-HSSCo-21mm HSS-Co Cobalt Twist Drill Bit, DIN 338, 21mm, Split Point 135°

Drilling into tough alloyed steel, stainless steel, or cast iron quickly dulls ordinary bits, forcing you to stop, resharpen, or replace them mid-job. The RUKO LOS-HSSCo-21mm solves that with a cobalt-alloyed HSS-Co body that retains hardness at high temperatures, so you can keep drilling without premature wear.

Who is it for

Metalworkers, maintenance technicians, and serious DIYers who need a dependable 21 mm twist drill for demanding materials. It is equally at home in a drill press or a powerful corded/cordless drill.

Main features

• 5% cobalt high-speed steel for very high heat and wear resistance.
• 135° split point starts on contact and reduces walking.
• Precision ground right-hand spiral flutes clear chips efficiently.
• DIN 338 cylindrical shank fits standard 13 mm chucks (note: 21 mm cutting diameter requires a drill with sufficient chuck capacity or a reduced shank adapter).
• Bronze/dark grey oxide finish improves chip flow and corrosion resistance.

Specifications

• Diameter: 21 mm
• Overall length: 180 mm
• Flute length: 120 mm
• Shank type: Cylindrical
• Point angle: 135°
• Point type: Split point
• Flute type: Right-hand spiral
• Material: HSS-Co (5% cobalt)
• Standard: DIN 338
• Surface finish: Bronze/dark grey oxide
• Pack quantity: 1 piece

Tips

Use cutting fluid or coolant for best results and longer tool life. Clamp your workpiece securely and reduce speed when drilling stainless steel to avoid work hardening.