Hertel SDD43274638 Step Drill Bit Cobalt 6 Sizes

Product Description

The HERTEL SDD43274638 is a cobalt step drill bit designed for drilling multiple hole sizes with a single tool. It covers six hole sizes ranging from 3/16 inch minimum to 1/2 inch maximum diameter, with a 3/8 inch step length between each size. The round shank with three flats measures 1/4 inch in diameter, providing a secure grip in most standard drill chucks and preventing slippage during use. The bright, uncoated finish is standard for cobalt tooling. This bit is suited for sheet metal work, electrical enclosures, plumbing panels, and similar applications where precise, clean stepped holes are required.

Step drill bits of this type are commonly used by electricians, HVAC technicians, plumbers, and other trade professionals who need to drill or enlarge holes in thin sheet metal, junction boxes, conduit knockouts, and control panel enclosures. The six-step design eliminates the need to swap between multiple twist bits when working through a range of hole sizes in a single job or service call. The 1/4 inch shank fits standard 3-jaw drill chucks on cordless and corded drills.

Key Features

• Cobalt tool material for improved heat resistance and durability in metal drilling applications
• Six hole sizes in a single bit, ranging from 3/16 inch to 1/2 inch diameter
• 3/8 inch step length for consistent hole sizing across steps
• 1/4 inch round shank with three flats prevents bit rotation in chuck
• Bright uncoated finish, standard for cobalt construction
• Lightweight at approximately 0.05 pounds for extended use without fatigue

Compatibility

Designed as a direct-fit step drill bit for use in any standard drill chuck accepting a 1/4 inch round shank. Suitable for drilling sheet metal and thin-gauge materials where hole diameters between 3/16 inch and 1/2 inch are required.

Installation Notes

This bit is installed and used by electricians, HVAC technicians, and plumbers working on sheet metal panels, enclosures, and equipment cabinets. Always de-energize electrical equipment and lock out power before drilling into panels or enclosures per applicable NFPA 70 and OSHA lockout/tagout requirements. Secure the workpiece before drilling to prevent movement, and use appropriate eye and hand protection. Do not apply excessive lateral force, as step bits are designed for axial drilling loads only.