RUKO SPB-DIN338 9.0mm HSS-Co Twist Drill Bit

Drilling into tough alloyed steel or stainless steel quickly dulls ordinary bits and creates off-center holes. The RUKO SPB-DIN338 9.0 mm HSS-Co twist drill bit solves this with a cobalt-alloyed high-speed steel body and a self-centering split point, so you get accurate, clean holes in demanding materials without premature wear.

Who is it for

Professionals and serious DIYers who regularly work with high-tensile steels, stainless steel, cast iron, and non-ferrous metals. If your standard HSS bits overheat and lose their edge on tough alloys, this cobalt bit is the upgrade you need.

Main features

• HSS-Co (5% cobalt) construction withstands high drilling temperatures and maintains hardness up to 1100 N/mm² tensile strength.
• 135° split point starts on contact and prevents walking, eliminating the need for center punching.
• Fully ground flutes with bright finish ensure efficient chip evacuation and reduced friction.
• Precision h8 tolerance and cylindrical shank fit standard drill chucks securely.
• DIN 338 standard dimensions: 125 mm total length, 87 mm working length.

Specifications

• Drill bit type: Twist drill bit
• Standard: DIN 338
• Material: HSS-Co (5% cobalt)
• Diameter: 9.0 mm
• Shank type: Cylindrical
• Shank diameter: 9.0 mm
• Point angle: 135°
• Point type: Split point
• Surface finish: Bright
• Flute type: Right-hand cutting
• Manufacturing process: Fully ground
• Tolerance: h8
• Total length: 125 mm
• Working length: 87 mm
• Recommended materials: Alloyed and unalloyed steel, stainless steel, cast iron, non-ferrous metals, plastics
• Max tensile strength: 1100 N/mm²

Tips

Use cutting fluid or coolant when drilling stainless steel or high-alloy steels to extend bit life. For deep holes, withdraw the bit periodically to clear chips and prevent binding. Store in a dry place to protect the bright finish from corrosion.