What Is A Step Drill Bit Used For And what Features

A Step Drill Bit, also called a step drill, step drill, or step drill is a tapered drill with increasing diameters staggered by steps. A step drill can be made of steel, cobalt-tipped steel, or carbide-tipped steel to drill holes through smooth substances such as aluminum, plastics, and wood, and complex substances along with bronze, solid iron, and steel.

Sometimes stepped drills can be coated with TiN (titanium nitride) and TiAlN (titanium aluminum nitride), making it stronger and more durable to provide long life to the supplier.

Who can use a form of drills to reduce round holes in workpieces? This article will find out which programs’ step exercises are used and what capabilities they have.

Stepped holes have, as the call suggests, exceptional steps that reduce the preferred diameter. Before taking a better look at the characteristics, we would really like to briefly move on to the term “CBN process”.

CBN process

If you study texts about steps exercises on the Internet, you will continually come across the abbreviation CBN. But what does it imply that staggered holes are produced by using the CBN process?

CBN stands for cubic crystalline boron nitride. Boron nitride is a boron-nitrogen chemical compound.
The “cubic” addition describes the crystalline form of the chemical compound. CBN is much more muscular than traditional abrasives and silicon carbide or corundum and is used to grind hardened excessive speed steels (HSS).

This also applies to us.

5 Features of Step Drill Bits

What Is A Step Drill Bit Used For And what Features

Point angle

Who can compare the head of stepped drills to the pinnacle of twist drills? Centering within the workpiece should be as smooth as possible with each training. The factor perspective is responsible for this.

The factor perspective is placed at the pinnacle of stepped exercise. The view between the two cutting edges is measured in the factor. As already mentioned, a factor perspective is needed to position the stepped bit within the fabric.

What Is A Step Drill Bit Used For And what Features

Our stepped bits have a small factor perspective of 118 ° and require much less tension while being centered within the fabric. The higher the perspective of the factor, the better the tension to the touch, and centering within the fabric requires additional tension.

  • Working with 50 distinct sizes with only 5 bits is possible.
  • Combination of tri-flattening and step design
  • Ideal for drilling through a variety of surfaces.
  • Titanium coating is extremely durable.
  • Treatment with heat
  • Tip for slipping point
  • Low quality carry case
  • Inexpensive

Point cuts and point thinnings

For smooth tapping, the stepped exercise requires a corresponding target beyond the small factor perspective.

The various factors are standardized in DIN 1412 shapes. The maximum shape that is not unusual for step drills is the shear factor (form C).

What Is A Step Drill Bit Used For And what Features

Stepped bits with C-shape medium flawlessly in thin sheet steel and are suitable for drilling in strong and over-alloyed steels. The pointcut is also the use of the CBN grinding process.

The drawing suggests the reduction factor of a twist drill from the side and from above. The reduction factor for stepped holes and twist holes is the same.

What Is A Step Drill Bit Used For And what Features

More records on exceptional paperwork can be found in our blog post “Spot Cuts and Factor Thinning of Twist Drills for Steel Cutting“.

What Is A Step Drill Bit Used For And what Features

Stepped holes commonly have cutting edges and a groove profile. Sharp edges reduce fabric. We have stepped drills with up to 3 cutting edges with instant grooves in our product range.

  • A drill bit holder and a carrying case are included.
  • The drill bit’s size is easily laser-engraved on the drill bit itself.
  • Lighter applications are ideal.
  • Not intended for use in heavy-duty construction.

Profile of flute (groove profile)

The groove profile serves as a channeling machine for the series and chip removal. What must remove the chips quickly? Otherwise, excessive heat will spread, and the drill will burn out. The chips that do not break are transported incredibly easily, as with a twist drill.

Stepped drills can have spirals and one-touch grooves. With the spiral groove, chip removal is much higher than with the one-touch track. The supplier’s lifestyle can be remarkably prolonged through excellent chip removal means.

What Is A Step Drill Bit Used For And what Features

Due to the deep-floor CBN spiral grooves, the blades, in the evaluation of conventionally milled grooves, are sharp and burr-free. This reduces buildup and bloodless welds on the reducing edges, resulting in substantially better-reducing performance.

  • Effective on metal
  • Great drill bit set for the money
  • Durable
  • Strong
  • Dull easily
  • Smaller bits break easily

Step angle

The stepped perspective for stepped holes is 90 ° and defines the transition from one step to another. Transitions between male and female steps should be as smooth as possible and barely noticeable.

What Is A Step Drill Bit Used For And what Features

Staggered transitions are used to chamfer or deburr the gap while reaching preferred diameters.

  • Spiral with two flutes
  • Designed for use with impact drivers
  • Speed is increased by using a split point tip.
  • Each step has an offset design with laser-engraved numbers.
  • Bits might get lost in walls

Number and diameter of steps

Stepped holes are indicated in sizes. These sizes decide the diameters and the variety of steps.

Number and diameter of steps

A length 1 step drill has 9 steps with distinctive diameters between 6 and 20mm (see image).


The stepped holes are perfect for the operation of sheet steel and are suitable for reducing non-ferrous metals, stainless steel sheets with a thickness of 1.5 mm, thermoplastic and thermosetting plastics, and all the latest generation metal sheets with a thickness four zero mm. You can tap, drill and deburr in one step with the stepped drill.

They are used especially within the sectors of industries.

Electrical (length four + length 9), sanitary engineering and heating techniques (length 6 + length 7), automotive, mechanical engineering, aviation (length zero / five, length zero / 9, length 1, length 2, length 3, length five) and switching systems (length zero / 9k, length 1k, length 2k) up to 2, sheet thickness zero mm.

Use coolants and lubricants to reduce metals. By using them, you can dramatically expand the step drill supplier’s lifestyle.

We deliver stepped drills with five HSS and HSSE-Co device steels and with TiN and TiAlN coatings. Depending on the metal of the device and the coating, the harder or softer substances can be reduced.

  • The bit’s structure has been shown to be capable and durable in drilling holes.
  • Allow material particles to readily escape for a more cleaner drilling process.
  • Sharpen your cutting skills on a wide range of materials.
  • Drilling on a variety of surfaces, including plastic, aluminium, copper, stainless steel, and others
  • In thicker applications, it is not advised for tiny hole sizes.
  • There is no need to retain a casing for pieces.

You can take a closer look at the 2 coatings in our articles:

Here you can download a length-dependent program outline and a paced desktop as PDF.

In this video, you can see how stepped drills are synthetic and in which programs you operate them:

Conclusion and summary

Step bits are ideally suited for cutting metals, plastics, and wood up to four mm, for stainless steel up to 1.5 mm.
The manufacture of stepped bits with the help of the CBN procedure allows to measure and reduce the cutting edges due to the better hardness during the whole grinding process. The shape of the fabric is easily reduced with the help of the much harder abrasive material.

Factor perspective and factor thinning ensure smooth centering and less complicated threading into the workpiece. As fast as the stepped bit has been drilled, the 2 or 3 reducing edges are already in place. Sharp, burr-free reducing edges reduce the workpiece and manipulate the chip on the groove profile.

The perspective of the step is 90 ° and determines the transition from one step to the next. Changes are used for chamfering or deburring the hole.

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