Bosch HSS Step Drill Bit 4-20 mm, 3-Flat Shank, 70.5 mm Length 2608597519

Sheet metal workers, electricians, and HVAC technicians often face the challenge of drilling clean, accurate holes in thin materials without the need for multiple drill bits. The Bosch HSS Step Drill Bit 2608597519 solves this by combining nine cutting diameters from 4 mm to 20 mm into a single tool. Its 3-flat shank ensures a secure grip in the drill chuck, preventing slippage during use. With a total length of 70.5 mm and a self-centering point, this step drill bit delivers precise, burr-free holes in sheet metal, non-ferrous metals, plastics, and wood.

Key specifications

• Drill bit type: Step drill bit
• Material: HSS (high-speed steel)
• Drilling diameter range: 4–20 mm
• Number of steps: 9 (2 mm increments)
• Shank type: 3-flat shank, 10 mm diameter
• Total length: 70.5 mm
• Max material thickness per step: 4 mm
• Self-centering point: Yes
• Coating: Uncoated
• Packaging quantity: 1 piece

Why choose it

This step drill bit eliminates the need to switch between multiple drill bits when creating holes of different sizes. The 3-flat shank provides a positive drive in standard drill chucks, reducing the risk of the bit spinning under load. The self-centering point allows for accurate positioning without a center punch, saving time on layout. Made from high-speed steel, it offers a good balance of hardness and toughness for drilling in common workshop materials. The uncoated surface is easy to resharpen, extending the tool's service life.

Ideal use cases

• Enlarging existing holes in sheet metal for cable glands or conduit fittings
• Drilling clean, round holes in plastic enclosures for switches and connectors
• Creating stepped holes in wood for countersunk screws or dowels
• Deburring and chamfering holes in one operation
• Working with thin non-ferrous metals such as aluminum and copper

Good to know

For best results, use a drill press or a steady hand with a corded or cordless drill. Apply moderate pressure and use cutting fluid when drilling metals to reduce heat and prolong bit life. The step drill bit is not suitable for hardened steel or concrete. Always wear safety glasses and secure the workpiece before drilling.