Hertel SDD43274844 Step Drill Bit 9 Hole Sizes Hss Tin

Product Description

The HERTEL SDD43274844 is a high speed steel step drill bit designed to drill multiple hole sizes in a single tool. It covers 9 hole sizes ranging from 4.00 mm to 20.00 mm minimum and maximum diameters respectively, eliminating the need to swap bits between steps. The TiN (titanium nitride) coating increases surface hardness and reduces friction, extending cutting life on ferrous and non-ferrous sheet materials. The round shank with three flats prevents bit slippage in the chuck during high-torque drilling. At 0.14 pounds, it is a compact tool suited for everyday trade and shop use.

Step drill bits like the SDD43274844 are used in HVAC, electrical, and plumbing trades for enlarging or creating clean, burr-reduced holes in sheet metal panels, electrical enclosures, junction boxes, and thin-gauge structural material. The stepped geometry allows a technician to stop at any intermediate hole size within the 9-step range without changing tools. The 5.00 mm step length provides enough wall contact at each diameter to produce a consistent, accurate hole profile. This bit is appropriate for use with standard corded or cordless drills and drill presses.

Key Features

• High speed steel construction for durability across ferrous and non-ferrous materials
• TiN coating reduces wear and extends cutting life
• 9 hole sizes in a single bit, from 4.00 mm to 20.00 mm
• Round shank with 3 flats prevents rotation or slippage in the chuck
• 5.00 mm step length for consistent, accurate hole profiles at each diameter
• 8.00 mm shank diameter compatible with standard drill chucks

Compatibility

Designed as an OEM-style replacement or direct-use step drill bit for trade and industrial applications requiring a 4.00 mm to 20.00 mm stepped hole range with a round-with-flats shank.

Installation Notes

Step drill bits are typically installed by HVAC technicians, electricians, and plumbers performing sheet metal or enclosure work. Before use, secure the workpiece firmly and ensure the drill chuck is properly tightened against the flat sections of the shank to prevent slipping. Apply consistent, moderate pressure and allow the bit to advance through each step at a controlled feed rate to avoid work hardening or bit deflection. Wear appropriate eye protection per standard shop safety practices.