Drilling is one of the mechanical separation processes used to create circular holes in a material by machining. This hole is called a bore.
There are 2 different types of drilling: Blind holes and through holes. A core hole must be drilled in order to be able to tap a thread into these holes. Core bores are so special because they have a certain dimension which is adapted to the thread to be tapped. This is why drills of these dimensions are also referred to as core drills.
In the individual tables of our catalogue you will find the corresponding core hole dimensions for your thread. These dimensions must always be adhered to during the manufacture of tapped holes! Click here to download our catalogue!
On this page you will find a brief overview of our drills and their properties. (Use the menu bar on the left to get to a specific drill type.) If you have any questions or would like to order from us, please contact us!
Our twist drills according to DIN 345 have a side chip angle of 27°, a point angle of 118° and a Morse taper shank according to DIN 228 Form B. The spirals of the drills are milled in a soft condition.
With our short twist drills, the side chip angle is also 27°, but the point angle varies between 118° and 135°. These drills also have a cylindrical shank. The type N version is intended for normal cutting materials.
There are two manufacturing processes for twist drills: roll-rolled and ground. Roll-rolled drills are produced by heating the blank and then deforming it into a spiral. With ground drills, on the other hand, the helix is made of the fully hardened material. Our drills have different surfaces so that you can distinguish them at first glance: HSS ground drills are bright, HSSE ground drills amber and roller-rolled drills are black.
The PowerSpike is the highlight of our twist drill range. This HSS drill, ground from solid material, is equipped with a three-face shank, which prevents slippage in the drill chuck and is therefore ideally suited for use in cordless screwdrivers and pillar drills. In addition, the PowerSpike has a self-centering tip which makes center punching superfluous. The cutting tip has parallel milled chamfer grooves, which result in a lower contact pressure and thus reduce the heat development at the cutting tip. The cross cutting edge has also been sharpened. The special geometry of the bevel ensures a clean cutting edge profile when drilling with the PowerSpike.
The tip of the step drills has the same structure as the tip of a twist drill. The tip angle ensures a pleasant centering in the workpiece, twist drills are also equipped with a point for easier tapping. The point bevel is a cross bevel shape C. The step drill is equipped with a straight or a spiral groove so that the chips can be easily removed. The transition between the different steps is very easy due to the step angle. Since the step drill has steps of different sizes, it is child’s play to drill a hole with the desired diameter. With only one working step you can drill, bore and deburr the hole.
Centring drills are used for the production of centring holes according to DIN 332.
Due to their short design with a thick shank, it is difficult for the drill to run. The actual hole is then drilled with a twist drill, which is guided laterally. The drills are right-hand cutting, twist fluted, made of HSS steel or hard metal.
There are 4 different shapes of this drill:
Form R (center hole 60° with rounded running surfaces)
Form A (centring bore 60° with straight running surfaces)
Form B (centring hole 60° plus protective lowering 120°)
Form C (centering bore 60° plus truncated conical countersink)
Plate peeling drills
The right-hand cutting plate peeling drills are available with both straight and spiral grooves. They are used to drill stepless holes in the thinnest sheet metal. Pre-drilling is not necessary, as the drill bit has a point according to DIN 1412 C. The drill bit can be used in the thinnest sheet metal. The drilling is burr-free and without deforming the sheet metal. The drill is axial and radial relief ground and has either a straight shank or a hexagonal shank.
Compared to a step drill, the hole is not straight but tapered.
HSS hole saws are used to saw through holes in various materials. The basic body made of tool steel is equipped with a welded HSS toothed ring. The angled arrangement of the HSS saw teeth effortlessly copes with the use in steel and iron sheets, non-ferrous and light metals, wood, plaster, cardboard, plastic, Plexiglas and much more.
The hole saws equipped with an HSS-Cobalt toothed ring can also be used for stainless steels such as V2A+V4A sheet metal. The overall height of the hole saws varies between 55 and 43.5 mm, depending on the size. GSR hole saws are equipped with a so-called variable toothing.
With a Vario toothing 4-6 teeth of different lengths per inch are used alternately (tpt – teeth per inch). In addition, the teeth of the saw are interlocked. This is done to avoid jamming in the material. The saw teeth are bent on one third to half alternately to the right and left (crossed against each other).
Both the SDS and the hexagonal shank holders are each equipped with an HSS ground guide drill. This can be fixed and replaced using a set screw (grub screw M8). The hole saws are fastened differently depending on the dimensions. The smaller hole saws (14-30 mm) have opposite lateral surfaces in order to use a nut wrench to tighten the mounting thread. The wrench widths vary between 16 and 26 mm depending on the size. From 32 mm diameter, the hole saws have 2 or 4 holes for the driving pins. These are fixed with a locking ring to prevent slipping during operation.
Quick-change drill chuck
The clamping of the insert tools is carried out without additional tools. As the cutting edges increase, the chuck also retightens automatically. The chuck can be opened easily even after intensive use of the drill. The high concentricity also makes it possible to use the chuck in CNC machine tools.
Our quick-change drill chucks are available in various designs. On the one hand as sleeve design in metal and plastic, on the other hand as gear rim drill chuck made of metal.
|Clamping capacity||taper mandrel holder|
|Clamping capacity||Locking thread|