Hertel SDD43274828 Step Drill Bit 13 Hole Sizes Hss Tin

Product Description

The HERTEL SDD43274828 is a high-speed steel step drill bit designed for drilling multiple hole sizes in a single tool. It covers 13 hole sizes ranging from 4 mm to 39 mm minimum to maximum diameter, with a 5 mm step length between each size. The shank is 10 mm in diameter with a round-with-flats profile featuring three flats for secure chuck grip. A titanium nitride (TiN) coating reduces friction and extends cutting edge life. This bit is suited for sheet metal, plastic, and thin-stock applications where a single stepped tool eliminates the need to swap bits across a wide size range.

This step drill bit fits standard drill chucks and is commonly used in fabrication shops, electrical and plumbing rough-in work, and HVAC installation where punching clean, precise holes through panels and light-gauge material is routine. The 13-step range makes it a versatile single-bit solution for trades that work with enclosures, junction boxes, conduit entry points, and sheet metal ductwork. Each package contains one bit.

Key Features

• 13 hole sizes from 4 mm minimum to 39 mm maximum diameter in one bit
• 5 mm step length provides clear size transitions and precise depth control
• High-speed steel (HSS) construction handles repeated use in metal and plastic
• Titanium nitride (TiN) coating reduces heat buildup and extends service life
• 10 mm round shank with three flats prevents slipping in drill chuck

Compatibility

Designed for use in standard drill chucks accepting a 10 mm round shank with flats. Suitable for step-drilling applications in sheet metal, plastic panels, and similar thin-stock materials common in HVAC, electrical, and plumbing trade work.

Installation Notes

Install in a drill press or handheld drill with a chuck rated for the 10 mm shank diameter. Ensure the work piece is clamped securely before drilling to prevent material movement and bit damage. Use cutting fluid when drilling through harder metals to manage heat and prolong coating life. Disengage power and allow the bit to come to a full stop before measuring holes or changing tools.