Broca helicoidal HSS-Co RUKO SPB-DIN338-TypUNI-HSSCo-4,20-SB 4,2 mm DIN 338

Drilling into hard steels, stainless steel, or cast iron quickly dulls ordinary HSS bits, causing wandering, overheating, and poor hole quality. The RUKO SPB-DIN338-TypUNI-HSSCo-4,20-SB solves this with a cobalt-alloyed HSS-Co body and a split point that bites instantly without center punching.

Who is it for

Metalworkers, maintenance technicians, and demanding DIYers who need a reliable 4.2 mm bit for tough materials up to 1100 N/mm² tensile strength.

Main features

• HSS-Co with 5% cobalt for high heat resistance and wear resistance
• DIN 338 standard dimensions: 75 mm overall length, 47 mm flute length
• 130° split point for accurate starting and reduced thrust
• Fully ground with bright finish for precise, clean holes
• Cylindrical shank, right-hand cutting, h8 tolerance

Specifications

• Drill bit type: Twist drill bit
• Standard: DIN 338
• Material: HSS-Co (5% cobalt)
• Diameter: 4.2 mm
• Overall length: 75 mm
• Working length: 47 mm
• Shank type: Cylindrical
• Shank diameter: 4.2 mm
• Point angle: 130°
• Point grind: Split point
• Cutting direction: Right-hand
• Surface finish: Bright
• Manufacturing process: Fully ground
• Tolerance: h8
• Recommended materials: Steel (alloyed/unalloyed), stainless steel, cast iron, non-ferrous metals, plastics
• Max. tensile strength: 1100 N/mm²
• Packaging quantity: 1 piece

Tips

Use cutting fluid when drilling stainless steel to extend bit life. The split point eliminates the need for center punching on most surfaces.