Hertel SDD43274810 Step Drill Bit Cobalt 14 Hole Sizes

Product Description

The HERTEL SDD43274810 is a cobalt step drill bit designed for drilling multiple hole sizes in a single tool. It covers 14 incremental hole sizes from 4 mm to 30 mm in diameter, with a 5 mm step length between each size. The 10 mm round shank with three flats prevents slipping in the chuck and provides positive drive during operation. The bright, uncoated finish suits general-purpose metal drilling applications. Electricians, HVAC technicians, and sheet metal workers use step drill bits like this to create clean, sized holes in thin-gauge steel, aluminum, and similar materials without requiring multiple bit changes.

This step drill bit is suited for trade professionals working in electrical panel rough-ins, HVAC sheet metal fab, plumbing penetrations through thin stock, and enclosure knockouts. The 14-step range makes it practical for applications where multiple knockout or clearance hole sizes are required in a single work session. The cobalt construction handles harder materials and maintains edge life better than standard high-speed steel in demanding shop or field conditions.

Key Features

• Cobalt tool material for improved hardness and heat resistance compared to standard HSS
• 14 hole sizes in one bit, ranging from 4 mm to 30 mm diameter
• 5 mm step length for controlled, incremental hole sizing
• 10 mm round shank with 3 flats for secure, slip-free chuck engagement
• Bright, uncoated finish — no coating to chip or flake during use
• Compact profile at approximately 3.94 inches long for use in tight spaces

Compatibility

Designed for use in standard drill chucks accepting a 10 mm round shank with flats. Suitable for drilling thin-gauge ferrous and non-ferrous metals, plastics, and similar sheet materials where a stepped hole progression is required.

Installation Notes

A licensed electrician, HVAC technician, or qualified sheet metal worker typically uses step drill bits for panel and enclosure work. Secure the workpiece firmly before drilling and use appropriate cutting fluid or lubricant on harder metals to extend bit life. Always wear eye protection when drilling metal. Ensure the drill chuck is fully tightened against the flats on the shank before operation to prevent bit slippage.