RUKO LOS-HSS-G21.0 mm Ground Twist Drill Bit HSS-G DIN 338 21 mm

Drilling large-diameter holes in tough materials demands a bit that stays sharp, runs true, and withstands heat. The RUKO LOS-HSS-G 21.0 mm twist drill bit is engineered for exactly that: a ground high-speed steel bit that bores clean, accurate holes in steel, cast iron, non-ferrous metals, plastics, and wood.

Who is it for

This bit is built for metalworkers, maintenance technicians, and serious DIYers who need a reliable 21 mm drill for drill presses or powerful handheld drills. If you regularly drill thick steel or cast iron, this is the bit that won't let you down.

Main features

• Precision ground from high-speed steel (HSS-G) for durability and sharpness
• 21.0 mm diameter with cylindrical shank, DIN 338 standard
• 118° point angle for general-purpose drilling in a wide range of materials
• Right-hand cutting direction, bright finish, h8 tolerance for consistent hole sizing
• Total length 205 mm, working length 135 mm

Specifications

• Drill Bit Type: Twist Drill Bit
• Material: High-Speed Steel (HSS-G)
• Manufacturing Process: Ground
• Diameter: 21.0 mm
• Shank Type: Cylindrical Shank
• Standard: DIN 338
• Point Angle: 118°
• Cutting Direction: Right-hand cut
• Surface Finish: Bright / Blank
• Tolerance: h8
• Total Length: 205 mm
• Working Length: 135 mm
• Recommended Materials: Steel, Cast Iron, Non-ferrous Metals, Plastics, Wood
• Packaging Quantity: 1 piece

Tips

Use a cutting fluid or coolant when drilling harder materials to extend bit life and improve hole quality. Secure the workpiece firmly, and start with a center punch or pilot hole for best accuracy at this diameter.