Bosch HSS Step Drill Bit 4-12 mm with 3-Flatted Shank

The Bosch HSS step drill bit, sized 4-12 mm, is a high-performance tool engineered for drilling precise, clean holes in thin materials. Constructed from durable high-speed steel, this bit is designed to withstand the rigors of frequent use while maintaining its cutting edge. The inclusion of a 3-flatted shank ensures a secure grip in standard drill chucks, preventing slippage during operation and providing stability for accurate results.

Advantages

This step drill bit offers significant versatility by allowing the user to drill multiple hole diameters with a single tool, eliminating the need for constant bit changes. The specialized geometry of the bit ensures that holes are drilled cleanly and are free of burrs, which reduces the need for secondary finishing work. Its robust construction provides excellent heat resistance and longevity, making it a reliable choice for both professional tradespeople and home improvement enthusiasts who require consistent performance in metalworking tasks.

Suitable for

• Drilling holes in thin metal sheets
• Creating holes in plastic and thin-walled pipes
• Electrical installation work
• General maintenance and repair tasks

When it may not be suitable

This tool is not intended for drilling through thick materials or hardened steel, as the step design is optimized for thin-gauge surfaces. It is also not suitable for use with impact drivers or hammer drills, which may damage the bit geometry.

Key specifications

• Diameter range: 4-12 mm
• Material: High-speed steel (HSS)
• Shank type: 3-flatted shank
• Total length: 66.5 mm
• Number of steps: 9

How to use

To use the Bosch HSS step drill bit, insert the 3-flatted shank securely into the chuck of your drill and tighten firmly. Ensure the workpiece is properly clamped to prevent movement. Begin drilling at a low speed, applying steady, moderate pressure to allow the cutting edges to engage with the material. As you progress through the steps, the bit will naturally enlarge the hole to the desired diameter. It is recommended to use a suitable cutting oil to reduce friction and heat, which will extend the life of the bit and improve the quality of the finish.

What to consider before purchase

• Verify that your drill chuck is compatible with a 3-flatted shank.
• Ensure the material thickness does not exceed the step height of the bit.
• Check that the required hole sizes fall within the 4-12 mm range.

Usage recommendations

For optimal results and to prevent overheating, always maintain a low drilling speed and use a cooling lubricant when working with metals.