Hertel SDD43274893 Step Drill Bit 9 Step Hss

Product Description

The HERTEL SDD43274893 is a high speed steel step drill bit designed to drill and enlarge holes in a single operation without bit changes. It steps through 9 hole sizes in one pass, covering a minimum diameter of approximately 0.157 inches up to a maximum of approximately 0.787 inches. The bright finish indicates an uncoated, precision-ground cutting surface. The 3-flat round shank measures approximately 0.315 inches in diameter and is engineered to resist slipping in drill chuck jaws. Licensed tradespeople and skilled tradespeople performing sheet metal, electrical panel knockout, and light structural work are the primary users.

This step drill bit is suited for use in sheet metal, thin-wall conduit, electrical enclosures, HVAC ductwork, and light-gauge steel or aluminum plate. The 9-step configuration and 5 mm step length allow the technician to stop at any required diameter rather than running a separate twist bit or knockout punch for each size. It is appropriate for both handheld drill drivers and drill press applications where repeatable hole sizing in thin material is required.

Key Features

• High speed steel construction for durability across repeated use in metal and thin-gauge materials
• 9 stepped hole sizes in a single bit eliminates mid-job bit changes
• 3-flat round shank resists rotation inside drill chuck jaws
• Bright finish ground surface for clean entry and exit holes in sheet stock
• Compact overall profile fits standard keyed and keyless drill chucks

Compatibility

Designed as a general-purpose step drill bit compatible with standard 3-jaw drill chucks accepting round-with-flats shanks up to approximately 0.315 inches in diameter.

Installation Notes

Step drill bits are installed by electricians, HVAC technicians, and sheet metal workers using a standard drill driver or drill press. Secure the workpiece fully before drilling and use cutting fluid when working in harder steel to extend cutting edge life. Confirm that the drill chuck is tightened firmly on all three flats before operation. Disconnect all power to electrical enclosures before drilling into live panels.