RUKO SPB-DIN338-TypUNI-HSSCo-4,20-SB HSS-Co Twist Drill Bit 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.