Heller 325042 HSS-Co Stepstar 5-delige HSS-Co metaalspiraalborenset DIN 338

Professional machinists and metal fabricators rely on the Heller 325042 HSS-Co Stepstar set for precise drilling in tough steels. This 5-piece set includes twist drill bits in diameters 4, 5, 6, 8, and 10 mm, each made from high-speed steel with 5% cobalt for enhanced heat resistance and durability. The split point with a 135° angle reduces walking and allows faster penetration, while the precision-ground bright finish ensures smooth chip evacuation. Supplied in a plastic cassette for organized storage, these bits are suitable for use with both corded and cordless drills.

Key specifications

• Drill bit type: Twist drill bit
• Material: HSS-Co (high-speed steel with cobalt)
• Cobalt content: 5%
• Number of pieces: 5
• Diameters: 4 mm, 5 mm, 6 mm, 8 mm, 10 mm
• Standard: DIN 338
• Point type: Split point
• Point angle: 135°
• Shank type: Cylindrical
• Manufacturing process: Precision ground
• Surface finish: Bright
• Series: Stepstar
• Packaging: Plastic cassette

Why choose it

The cobalt alloy withstands high drilling temperatures, making these bits ideal for stainless steel, cast iron, and acid-resistant steel. The split point design centers the bit accurately, reducing the need for center punching and improving hole quality.

Ideal use cases

• Drilling stainless steel and acid-resistant steel in metalworking shops
• Maintenance and repair tasks on cast iron components
• General metal fabrication with corded or cordless drills

Good to know

The set is packaged in a plastic cassette for easy storage and transport. The bits conform to DIN 338, ensuring consistent dimensions and performance.