Hertel SDD43274695 Step Drill Bit 6 Hole Sizes Hss Tin

Product Description

The HERTEL SDD43274695 is a high-speed steel step drill bit designed to drill multiple hole sizes in a single tool. It covers 6 hole sizes ranging from 3/16 inch minimum to 1/2 inch maximum diameter, with a 3/8 inch step length between each diameter increment. The 1/4 inch round shank features three flats for secure chuck engagement and reduced slipping under load. A titanium nitride (TiN) coating increases surface hardness and reduces friction, extending tool life in sheet metal, light-gauge steel, aluminum, and plastic applications. Electricians, plumbers, and HVAC technicians rely on step bits like this one for clean, burr-reduced holes in enclosures, panels, and ductwork.

This step drill bit is suited for trade professionals who need to produce multiple hole sizes without changing tools. Typical applications include punching clean holes in electrical junction boxes, conduit knockouts, sheet metal duct fittings, and thin-wall tubing. The six-step profile handles a range of common trade hole sizes in one pass, making it practical for service work where speed and tool inventory management matter. It is appropriate for use with standard 3/8 inch or 1/2 inch keyed or keyless drill chucks.

Key Features

• 6 hole sizes in one bit, ranging from 3/16 inch to 1/2 inch diameter
• 3/8 inch step length between each diameter increment
• High-speed steel construction for durability in ferrous and non-ferrous materials
• Titanium nitride (TiN) coating reduces friction and extends cutting life
• 1/4 inch round shank with 3 flats prevents chuck slippage

Compatibility

Designed as a general-purpose step drill bit compatible with standard 3/8 inch or 1/2 inch drill chucks accepting 1/4 inch round shanks with flats.

Installation Notes

Step drill bits are typically used by electricians, plumbers, and HVAC technicians when working with sheet metal, electrical enclosures, or thin-wall materials. Use a center punch to mark the starting point before drilling to prevent walking. Keep drill speed appropriate for the material being cut and apply light cutting oil when drilling ferrous metals to preserve the TiN coating and extend bit life. Always wear appropriate eye protection when operating rotary cutting tools.