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Tapered drill bit 6-30 mm - No. 2 HSS
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  • Tapered drill bit 6-30 mm - No. 2 HSS
  • Tapered drill bit 6-30 mm - No. 2 HSS - nr. 1
Bucovice

Tapered Drill 6-30 No. 2 HSS

Bucovice Bucovice
0000003616
€43.70 tax inc.

Net price: €35.53

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W magazynie: 10-100 szt.
W magazynie: 10-100 szt.

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Call and order: (44) 755-04-05

Description

Diameter range6–30 mm
Steps13 in 2 mm increments
MaterialHSS
Steel sheetup to 4 mm

6-30 mm step drill – for metal, HSS

Technical data and dimensions – 13 steps in 2 mm increments, 10 mm shank

Technical data
Diameter range6–30 mm
Steps13, in 2 mm increments: 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30 mm
Flutestraight
Shank diameter d10 mm, straight
Overall length L100 mm
MaterialHSS (high-speed steel)
Steel, cast iron, bronze0.3–4 mm sheet
Aluminum, brass, copper0.3–6 mm sheet
Plasticsup to 10 mm
ManufacturerBučovice Tools, Czech Republic
6-30 mm HSS step drill – dimensional drawing, 13 steps, 10 mm shank, 100 mm length
6-30 mm HSS step drill – dimensional drawing, 13 steps, 10 mm shank, 100 mm length

6-30 mm step drill drills holes from 6 to 30 mm in sheet metal with a single tool. It has 13 steps in 2 mm increments. Each step enlarges the hole by 2 mm and is guided by the hole made by the previous step. This keeps successive diameters coaxial without changing drills. Secure the 10 mm straight shank in a drill chuck.

The drawing shows the diameters of all steps, the shank and the overall length of 100 mm. The outline of the steps forms a cone, hence the name. The same tool is also called a step drill or Christmas tree drill. The manufacturer, the Czech company Bučovice Tools, calls it a straight-flute step drill. The flute runs along all the steps, and its edge cuts at each one. The drill is made of uncoated high-speed steel (HSS).

Applications – sheet metal, profiles and deburring

Three uses for one drill

The drill is useful for metalworking, installation, and electrical work. It performs best in thin materials: sheet metal, panels, and section walls. In these applications, a large twist drill can easily tear the sheet and leave a ragged edge. The steps cut successively in radial increments of 1 mm, preventing the sheet from tearing.

Drilling a hole in thin enclosure sheet metal with a 6-30 mm step drill

Hole in thin sheet metal

Start drilling the enclosure or panel sheet metal with the smallest 6 mm step. The drill advances through successive steps until the hole reaches the required diameter. You can drill through steel up to 4 mm thick, and aluminum and copper up to 6 mm thick. The hole edge remains even.

Deburring a hole edge with the next larger step of a step drill

Deburring the hole edge

Drilling leaves a burr on the hole edge. Lightly touch the edge with the next larger step. The step removes the burr and produces a small chamfer. This lets you deburr holes from 6 to 28 mm with the same drill.

Hole in a hollow section wall made with an HSS step drill

Hole in a section or tube

The drill also drills through hollow section walls and thin-walled tubing. The same thickness limits apply as for sheet metal: up to 4 mm for steel and up to 6 mm for aluminum. Select the hole diameter by the step, without changing tools.

Drilling sheet metal step by step

Thickness, speed, oil, and deburring

Four steps take you from measuring the sheet to a finished, deburred hole. Thicknesses, speeds, and cooling recommendations come from the Bučovice Tools catalog for this drill.

Measuring steel sheet thickness before drilling with a 6-30 mm step drill
1

Check the sheet thickness

You can drill through steel, cast iron, and bronze up to 4 mm thick. Aluminum, brass, and copper up to 6 mm, and plastics up to 10 mm. These values are specified in the manufacturer's catalog.

Setting the drill speed and applying oil at the drilling location for a step drill
2

Set the speed and apply oil

Select the speed for the largest step that will pass through the sheet. For steel and the 30 mm step, this is 150 rpm. For smaller steps, the manufacturer permits up to 600 rpm. Apply oil to the drilling location.

12 mm hole in sheet metal after the fourth step of the step drill passes through
3

Drill to the required step

Count the steps from the tip: 6, 8, 10, 12 mm. You have a 12 mm hole when the fourth step passes through the sheet. Each step enlarges the hole by 2 mm, without changing drills.

Deburring a hole edge in sheet metal with the next step of a step drill
✓

Deburr the edge

Lightly touch the hole edge with the next larger step. The transition between steps removes the burr and leaves a small chamfer. You can deburr holes from 6 to 28 mm in the same way. No separate deburring tool is needed.

Speeds and cooling – steel, cast iron, aluminum, plastics

Values from the Bučovice Tools catalog for the 6–30 mm HSS drill

The manufacturer specifies a speed range. The higher value applies to the smallest 6 mm step, and the lower value to the largest 30 mm step. For intermediate steps, set a speed within the range, closer to the lower value.

Workpiece materialSpeed: step 6 mm → 30 mm [rpm]Thickness [mm]Coolant supply
P Non-alloy structural steel up to 500 MPa600 → 1500.3–4oil
P Alloy structural steel up to 800 MPa500 → 1000.3–4oil
K Ductile and malleable cast iron500 → 1000.3–4oil
N Bronze, short-chipping brass500 → 1000.3–4oil
N Aluminum, long-chipping brass, copper1200 → 4000.3–6oil
N Plastics700 → 200up to 10water or oil

Calculation: why larger steps require lower speeds

Cutting speed is the speed at which the cutting edge moves across the material. Speed = 3.14 × step diameter 30 mm × rotational speed 150 rpm ÷ 1000 ≈ 14.1 m/min. At the 6 mm step and 600 rpm, the result is approximately 11.3 m/min. A larger step has a greater circumference, so at the same rotational speed the cutting edge would move faster and overheat. This is why you set the speed for the largest step that will pass through the sheet.

▲
Stainless and hardened steel – no manufacturer data

Bučovice Tools does not specify speeds or thicknesses for stainless steel, hardened steels, high-speed steels, or heat-resistant alloys. Do not machine these materials with this drill. The manufacturer permits gray cast iron, copper, and alloy tool steel with restrictions.

6-30 mm step drill HSS drills 13 diameters in sheet metal, from 6 to 30 mm in 2 mm increments. It drills through steel up to 4 mm thick, aluminum, brass, and copper up to 6 mm, and plastics up to 10 mm. Successive steps enlarge the hole concentrically and deburr its edge. The 10 mm straight shank and 100 mm length fit a drill chuck.

Questions about the 6-30 mm step drill

Thickness, speeds, materials

Steel, cast iron, and bronze from 0.3 to 4 mm. Aluminum, long-chipping brass, and copper from 0.3 to 6 mm. Plastics up to 10 mm. These are the ranges specified in the Bučovice Tools catalog.

For structural steel, from 600 rpm at the 6 mm step to 150 rpm at the 30 mm step. For aluminum, from 1200 to 400 rpm. Set the speed for the largest step that will pass through the material.

For structural and tool steels up to 900 MPa, cast steel, ductile cast iron, and malleable cast iron. Also for bronze, brass, aluminum, zinc, and plastics. The manufacturer permits gray cast iron and copper with restrictions.

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Tapered Drill 6-30 No. 2 HSS

Tapered Drill 6-30 No. 2 HSS

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