RUKO SPB-DIN338-11.9mm Roll-Forged HSS-R Twist Drill Bit

Drilling precise 11.9 mm holes in tough materials like steel and cast iron requires a bit that stays sharp and centered. The RUKO SPB-DIN338-11.9mm roll-forged twist drill bit is built for exactly that, with a robust HSS-R construction and a 118° point angle for efficient cutting.

Who is it for

This drill bit is ideal for metalworkers, machinists, and serious DIYers who need reliable performance in steel, cast steel, grey cast iron, malleable cast iron, non-ferrous metals, and plastics. It suits both hand drills and stationary machines.

Main features

• Roll-forged HSS-R high-speed steel for toughness and wear resistance
• DIN 338 standard dimensions: 142 mm overall length, 101 mm working length
• 11.9 mm diameter with cylindrical shank, h8 tolerance for secure chuck grip
• 118° point angle suitable for general-purpose drilling in metal
• Black oxide / steam tempered surface finish reduces friction and improves chip flow
• Right-hand cutting flutes with standard helix angle (25-30°) for efficient material removal

Specifications

• Drill Bit Type: Twist Drill Bit
• Standard: DIN 338
• Material: HSS-R (High Speed Steel - Roll-forged)
• Diameter: 11.9 mm
• Shank Type: Cylindrical
• Shank Diameter: 11.9 mm
• Overall Length (L1): 142 mm
• Working Length (L2): 101 mm
• Point Angle: 118°
• Flute Type: Right-hand cutting
• Surface Finish: Black oxide / Steam tempered
• Manufacturing Process: Roll-forged
• Tolerance: h8
• Recommended Materials: Steel, Cast Steel, Grey Cast Iron, Malleable Cast Iron, Non-ferrous Metals, Plastics
• Max Tensile Strength: Up to 900 N/mm²
• Core Thickness: Standard
• Web Taper: Standard
• Helix Angle: Standard (approx. 25-30°)
• Self-Centering Point: No (118° point typically requires pre-punching)
• Coolant Through: No

Tips

For best results, use a center punch to mark the hole location before drilling, especially on hard metals. Apply cutting fluid to reduce heat and extend bit life. Ensure the drill is set to the correct speed for the material being drilled.