RUKO ZEB-HSS-DIN333-A-3.15mm Center Drill Bit

The RUKO ZEB-HSS-DIN333-A-3.15mm center drill stands out with its DIN 333 Form A geometry, engineered for precise centering before drilling or machining. Unlike standard twist drills, its short, rigid flute and 60° point create accurate center holes in a single pass, reducing workpiece setup errors.

Highlights

• High-speed steel (HSS) construction with hardened and tempered treatment for durability
• Ground from solid for consistent cutting edges and clean hole entry
• Straight flute design for efficient chip evacuation in shallow center drilling
• Right-hand cut, bright finish, plain form without protective chamfer

In daily use

Ideal for preparing workpieces for subsequent drilling on lathes, milling machines, and drill presses. The 3.15 mm cutting diameter suits small to medium pilot holes in steel, cast iron, non-ferrous metals, and plastics. The 8 mm shank fits standard drill chucks, and the 50 mm overall length provides good reach without sacrificing rigidity.

Full specifications

• Material: HSS (High-Speed Steel)
• Standard: DIN 333
• Form/Type: A (Plain form without protective chamfer)
• Cutting Diameter (d1): 3.15 mm
• Shank Diameter (d2): 8 mm
• Overall Length (l1): 50 mm
• Point Angle: 60°
• Flute Type: Straight Flute
• Manufacturing Process: Ground
• Direction of Cut: Right-hand cut
• Heat Treatment: Hardened and tempered
• Surface Finish: Bright / Uncoated
• Series: Zebra
• Tool Type: Center Drill

Final note

A precise center drill for reliable hole starting, built to DIN 333 standards and backed by RUKO's ZEBRA series quality.