Hertel SDD43274562 Step Drill Bit Cobalt 9 Hole Sizes

Product Description

The HERTEL SDD43274562 is a cobalt step drill bit designed for drilling multiple hole sizes in a single operation. Built from cobalt high-speed steel, it delivers the heat resistance and edge retention needed when working through hardened steel, stainless, and other tough materials. The bit covers nine hole sizes ranging from 4 mm to 12 mm in 5 mm step increments, with a bright uncoated finish. The 6.5 mm round shank features three flats to prevent slipping in the chuck. This bit is suited for electricians, pipefitters, HVAC technicians, and sheet metal workers who need clean, accurate step-drilled holes without changing bits.

This step drill bit is used in metal fabrication, electrical panel work, conduit knockout applications, and HVAC sheet metal installations. It is effective on steel sheet, thin plate, and similar materials where stepped holes are required. The nine-step range from 4 mm to 12 mm makes it a practical single-tool solution for tradespeople drilling multiple hole sizes in one layout pass.

Key Features

• Cobalt construction for high heat resistance and extended tool life in hard materials
• Nine hole sizes in a single bit, ranging from 4 mm to 12 mm
• 5 mm step length for controlled, incremental cutting
• 6.5 mm round shank with three flats prevents chuck slip during use
• Bright uncoated finish suited for general-purpose metal drilling

Compatibility

Designed as a general-purpose step drill bit compatible with standard 3-jaw drill chucks accepting a 6.5 mm round shank with flats.

Installation Notes

This bit is installed and used by electricians, HVAC technicians, and pipefitters working with drill presses or hand-held power drills. Secure the shank firmly in a drill chuck before operation and confirm the workpiece is clamped or secured. Use appropriate cutting fluid or lubricant when drilling hardened or stainless steel to preserve edge life. Follow all applicable workplace safety standards when operating rotary cutting tools.