Hertel SD6560221 Step Drill Bit 6 Sizes Tin Hss

Product Description

The HERTEL SD6560221 is a high-speed steel step drill bit designed to drill six progressively sized holes in a single tool, ranging from 3/16 inch to 1/2 inch in 1/16 inch increments. Built from M2 high-speed steel with a titanium nitride (TiN) coating, this bit delivers extended tool life when working through sheet metal, electrical panels, conduit knockouts, and similar thin-material applications. The cylindrical shank with one flat measures 1/4 inch in diameter and seats securely in standard drill chucks. Overall length is 3-7/32 inches. The concave flute geometry helps clear chips efficiently, reducing heat buildup during repetitive drilling tasks.

This step drill bit is suited for trade professionals who regularly punch clean, burr-minimized holes in sheet metal, electrical enclosures, junction boxes, HVAC panels, and ductwork. The HSTH-TN series is general-purpose and multipurpose in application, making it a practical addition to any electrician, HVAC technician, or plumber's tool kit. The quick-change design and 3/8 inch step length per increment allow the installer to stop at the precise diameter needed without a separate tool change. It handles residential and light commercial work where consistent, repeatable hole sizing matters.

Key Features

• M2 high-speed steel construction for durability in metal drilling applications
• TiN coating extends cutting edge life and reduces friction
• Six hole sizes in one bit: 3/16, 1/4, 5/16, 3/8, 7/16, and 1/2 inch
• 1/16 inch step increments allow precise hole sizing without bit changes
• Concave flute design promotes chip evacuation and reduces heat
• Quick-change cylindrical shank with one flat fits standard 1/4 inch chuck systems

Compatibility

Designed as a general-purpose step drill bit compatible with standard 1/4 inch cylindrical shank drill chucks and quick-change driver systems. Suitable for use in sheet metal, thin steel panels, aluminum, and similar materials where stepped hole sizing is required.

Installation Notes

Step drill bits of this type are installed by electricians, HVAC technicians, and plumbers working on panel knockouts, enclosures, and thin metal components. Secure the workpiece before drilling and use the appropriate RPM for the material thickness and hole diameter. Apply cutting fluid when drilling harder metals to extend bit life and maintain dimensional accuracy. Inspect the cutting edges regularly; TiN-coated HSS bits should be replaced rather than resharpened when the coating wears through at the cutting edge.