RUKO SPB-DIN1897-HSSCo-Ø3.25mm Stub Drill Bit

Drilling into tough materials like stainless steel or alloyed steel can quickly dull standard drill bits, leading to wasted time and poor hole quality. This RUKO stub drill bit solves that problem with a cobalt-alloyed high-speed steel construction that retains hardness even at high temperatures.

Who is it for

Machinists, metalworkers, and serious DIYers who need a reliable, precise drill bit for demanding materials such as stainless steel, alloyed steel, cast iron, and non-ferrous metals. Its short, rigid design makes it ideal for use in CNC machines, drill presses, or hand drills where accuracy is critical.

Main features

• Made from HSS-Co with 5% cobalt for high heat resistance and durability
• Stub length (49 mm total) provides exceptional rigidity and reduces deflection
• 135° split point self-centers and reduces walking, eliminating the need for a center punch
• Ground from solid with h8 tolerance for precise hole diameters
• Bright finish for clean cutting and corrosion resistance

Specifications

• Drill bit type: Stub drill bit
• Standard: DIN 1897
• Material: HSS-Co (5% cobalt)
• Diameter: 3.25 mm
• Total length: 49 mm
• Flute length: 24 mm
• Shank type: Parallel shank
• Shank diameter: 3.25 mm
• Point angle: 135°
• Point grind: Split point
• Surface finish: Bright
• Tolerance: h8
• Manufacturing process: Ground from solid
• Direction of cut: Right-hand cut

Tips

Use cutting fluid or coolant when drilling stainless steel to extend tool life and improve surface finish. For best results, ensure the workpiece is securely clamped and the drill is held perpendicular to the surface.