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HSS Step Drill Bit: A Practical Tool for Precise Hole Drilling
An HSS step drill bit allows you to drill and enlarge holes of different diameters using a single tool. The NÁSTROJE CZ range includes step drill bits in several designs, including HSS, TiN-coated HSS and more durable HSSCo5 versions.
What Is an HSS Step Drill Bit?
A step drill bit, often referred to as a Christmas-tree drill bit because of its shape, has several cutting steps with different diameters. This allows you to gradually drill a hole to the required size without having to switch between several conventional drill bits.
HSS stands for high-speed steel, a material suitable for standard drilling in metal materials. Some versions also feature a TiN coating, which helps to improve the surface durability of the tool.
What Is a Step Drill Bit Used For?
Step drill bits are primarily designed for drilling circular holes in thin sheet metal and other materials. They can be used for electrical installations, fitting cable glands, modifying sheet-metal enclosures or working on automotive components.
They are particularly suitable for:
steel and stainless-steel sheets,
aluminium and copper,
plastic covers and enclosures,
switchboards and electrical cabinets,
pipes and thin-walled profiles,
enlarging existing holes.
A step drill bit also makes deburring holes easier. Once the required diameter has been reached, the edge of the hole can be lightly finished using the next step.
Benefits of Step Drill Bits from the NÁSTROJE CZ Range
The main advantage is having several diameters in a single tool. This eliminates the need to repeatedly search for and change individual drill bits. The range includes conventional versions with straight flutes as well as precision-ground drill bits with spiral flutes.
The ground spiral flute ensures smooth cutting during drilling, supports chip breaking and helps with rapid chip evacuation. On selected models, the spiral flute also makes it easier to remove the drill bit from the finished hole.
Selected drill bits feature a three-flat shank, which helps prevent the bit from slipping in the chuck. Smaller models are also available with a practical 1/4-inch hex shank, suitable for use in a cordless screwdriver or bit holder.
Available Size Ranges and Designs
The range includes various diameter ranges for different applications:
HSS 4–12 mm – for smaller holes,
HSS 4–20 mm with a 1/4-inch hex shank – a practical option for cordless tools,
HSS 4–39 mm with a spiral flute – for more versatile applications,
HSS 6–60 mm – for larger holes,
HSSCo5 4–20 mm and 4–30 mm – for more demanding applications.
For general DIY work and electrical installations, a range of 4–12 or 4–20 mm is often sufficient. If you need to drill larger holes, the 4–39 or 6–60 mm version will be more practical. An HSSCo5 drill bit is recommended for more demanding conditions.
How to Use a Step Drill Bit Correctly
Recommended Procedure
Secure the workpiece firmly to prevent it from moving during drilling.
Mark the drilling position.
Select the appropriate rotational speed according to the material and required hole size.
Keep the drill bit perpendicular to the surface.
Continue through the individual steps until you reach the required diameter.
When drilling metal, use cutting oil or a suitable coolant.
After drilling, remove any remaining burrs from the hole.
Avoid applying excessive pressure while drilling. Excessive force may cause the tool to overheat, reduce the quality of the hole or accelerate wear on the cutting edges.
Frequently Asked Questions
Why Is a Step Drill Bit Sometimes Called a Christmas-Tree Drill Bit?
Because of its conical shape and its series of stepped cutting edges.
Is an HSS Drill Bit Suitable for Metal?
Yes, HSS drill bits are primarily designed for drilling metal materials, particularly thin sheet metal. It is important to use the correct rotational speed and a suitable cutting fluid when drilling.
Which Drill Bit Range Should I Choose?
It depends on the size of the holes you need to drill. The 4–12 mm range is suitable for smaller holes, while the 4–20 or 4–39 mm range covers more versatile applications. For large holes, the 6–60 mm model is a suitable choice.
What Is the Difference Between HSS and HSSCo5?
HSSCo5 contains approximately 5% cobalt. Compared with a standard HSS drill bit, it offers greater durability during demanding drilling operations and when working with harder materials.
Conclusion
An HSS step drill bit is a practical tool for anyone who needs to drill holes of different diameters quickly and accurately. By combining several steps in a single drill bit, it saves time, simplifies the work and also helps with deburring holes.
The NÁSTROJE CZ range includes standard HSS drill bits, TiN-coated versions, drill bits with spiral flutes and durable HSSCo5 designs. Simply choose the appropriate diameter range and shank type for your tools and intended application.
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