RUKO 204 Series Stub Drill Bit DIN 1897 HSS-Co 5% Cobalt 3.6 mm

Precision-ground stub drill bit with 5% cobalt high-speed steel, engineered for stable drilling in alloyed and unalloyed steel, stainless steel, cast iron, non-ferrous metals, and plastics. The 135° split point reduces walking and provides accurate centering, while the bright finish and fully ground flutes ensure efficient chip evacuation.

Overview

This RUKO 204 Series stub drill bit conforms to DIN 1897, featuring a short overall length of 66 mm and a cutting length of 39 mm for enhanced rigidity and reduced vibration. The 3.6 mm diameter with h8 tolerance and parallel shank fits standard drill chucks, making it suitable for handheld drills and stationary drilling machines.

What stands out

• 5% cobalt HSS withstands temperatures up to 600°C, extending tool life in demanding applications.
• 135° point angle and standard spiral flute geometry deliver precise hole quality.
• Fully ground bright finish ensures smooth chip flow and consistent performance.
• Right-hand cutting direction for conventional drilling operations.

Technical details

• Drill bit type: Stub drill bit
• Standard: DIN 1897
• Material: HSS-Co (5% cobalt)
• Diameter: 3.6 mm
• Shank type: Parallel shank
• Point angle: 135°
• Surface finish: Bright finish
• Manufacturing process: Fully ground
• Total length: 66 mm
• Cutting length: 39 mm
• Application: Alloyed and unalloyed steel, stainless steel, cast iron, non-ferrous metals, plastics
• Direction of cut: Right-hand cutting
• Tolerance: h8
• Flute type: Standard spiral flute
• Core thickness: Normal
• Web taper: Normal
• Heat resistance: Up to 600°C
• Recommended use: Handheld drills, stationary drilling machines
• Brand series: RUKO 204 Series

Our verdict

A reliable stub drill bit for precision drilling in tough materials, backed by RUKO's quality manufacturing.