Hertel SDD43274547 Cobalt Step Drill Bit 9 Sizes

Product Description

The HERTEL SDD43274547 is a cobalt step drill bit designed for drilling multiple hole sizes in a single tool. It covers 9 hole sizes ranging from 4 mm to 20 mm in diameter, with a 5 mm step length between each size. The round shank with three flats measures 8 mm in diameter, providing a secure grip in standard chucks. The bright, uncoated finish is typical of cobalt high-speed steel tooling built for use in metal fabrication, HVAC sheet metal work, and general industrial drilling applications. Electricians, HVAC technicians, and metal fabricators regularly use step bits like this to punch clean, sized holes in thin to medium gauge sheet metal and conduit boxes.

This step drill bit is suited for sheet metal, electrical enclosures, conduit knockout work, and light structural steel. The 9-step geometry allows the user to drill a range of diameters without swapping bits, making it practical for field service and shop use alike. The cobalt construction provides improved heat resistance over standard high-speed steel, which is useful when drilling harder ferrous metals or working in high-duty-cycle environments.

Key Features

• Cobalt tool material for improved heat and wear resistance over standard HSS
• 9 hole sizes in a single bit, from 4 mm minimum to 20 mm maximum diameter
• 5 mm step length for controlled, incremental hole sizing
• 8 mm round shank with 3 flats for secure chuck retention and anti-rotation
• Bright uncoated finish standard for cobalt step tooling

Compatibility

Designed as an OEM-style step drill bit compatible with standard 3-flat or round chuck configurations accepting an 8 mm shank.

Installation Notes

Step drill bits of this type are installed and used by electricians, HVAC technicians, and metal fabricators working with sheet metal and thin steel panels. Secure the shank firmly in the drill chuck before use and confirm the workpiece is clamped or secured. Use appropriate cutting fluid when drilling harder ferrous metals to prolong tool life. Follow applicable shop safety and PPE requirements for rotary cutting tools.