Twist drill HSS-G Ø 4,0mm

The HSS-G twist drill with 4.0mm diameter for plastics and metals with self-centring point in cross-grinding is characterised by perfect, round hole drillings thanks to the profile-ground quality and is available at favourable graduated prices.

✓ Profile-ground quality
✓ Long-lasting sharpness
✓ Very long tool life
✓ Manufactured according to DIN 338
✓ Normal spiral twist (type N)
✓ 118° point angle

The ground HSS drill bit is ideal for plastic sheets, aluminium composite sheets and as a metal drill bit also suitable for a wide range of metals.

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0,0100 kg / pc.

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HSS drill Ø 4.0mm - Also ideal for pre-drilling

Long-life HSS steel ✓ Ground cutting edge ✓ High-precision bore ✓

Our HSS drill with a diameter of 4.0mm is made of durable tool steel with a particularly long service life and is equally suitable for drilling our plastic panels as well as a wide variety of metals. The drills are the perfect choice especially for our decorative profiles made of aluminium which are used to cover cut edges on facade panels and partition walls, because the stability of a construction can be significantly increased when these are screwed with suitable screws in addition to conventional bonding. Pre-grinding of the holes is not absolutely necessary, because the 4 mm drill bit already cuts in the middle due to the cross-grinding of the drill tip, which results in precise holes with self-centring properties.

The HSS-G drill with a normal spiral twist of type N, has a drill point whose cutting edge has been cross ground with a point angle of 118 degrees. The metal drill has a diameter of 4.0mm for both the drill spiral and the cylindrical shank and is made from a high-quality alloy of high-performance high-speed steel. The overall length of the small drill bit measures 75mm, of which 43mm is accounted for by the milled drill spiral and 32mm by the cylindrical shank. This gives the drill a sufficient length to drill through larger material thicknesses of approx. 50mm without any problems.

The difference between the usually cheaper HSS-R drills and our HSS-G drills lies in the manufacturing process. Both use a blank of high-speed steel, which in the case of the HSS-R drill is heated until it can be rolled to its final shape. This is why these drills are also called roll-rolled drills. In the case of the HSS-G drill, the G stands for ground. Here, the drill spiral and the drill head are milled out of the blank and then profile ground for even greater sharpness. This not only enables more precise, round holes to be drilled, but also facilitates drilling with less effort. Due to the cross-grinding of the drill tip, the drill already cuts in the middle, which results in self-centring properties.

    Scope of delivery:
  • 1 x HSS-G twist drill in Ø 4.0mm

NOTE: For precise drilling of the highest quality, always use intact drills. Damage to the drill tip or the drill spiral can significantly reduce the quality of the drill hole.

Technical data of our 4mm HSS-G drill bit

  • Ø Bore: 4.0mm
  • Ø Shank: 4.0mm
  • Drill: Twist drill
  • Standard: DIN 338
  • Spiral length: 43mm
  • Overall length: 75mm
  • Take-up: Straight shank
  • Direction of rotation: Clockwise
  • Material: High-speed steel (HSS)
  • Tip angle: 118°
  • Grinding: Cross grinding
  • Type: N (normal spiral twist)

Application examples for the HSS drill in Ø 4.0mm

Our 4mm drill is just as suitable as our 3mm drill for drilling our aluminium profiles in order to screw them to the corresponding panels as edge coverings. In addition, a 4mm drill bit is also ideal for pre-drilling plastic panels or wood for screw fastenings that are to be screwed with 4.5-5.5 mm screws. The drill is also ideal for drilling holes in substructures on which cladding is later to be mounted with our head-lacquered facade screws in 35x5.5mm. The drill is also very well suited for screw connections with threaded screws in size M4, for example, to produce machine covers made of steel or plastic that are to be screwed to the machine.

For drill holes in metal with a diameter of 6 mm or more, it can make sense to pre-drill the holes in advance with a smaller drill. With ground precision drills, this additional work step is usually not necessary, but it can significantly reduce the service life of the drills as well as the effort required by man and machine when drilling. Pre-drilling can have a positive effect, especially with thicker plates or hard metal alloys, because the smaller hole drilled provides the thicker drill with precise guidance and has less trouble removing the drill chip, which results in reduced heat generation.

An HSS drill bit is mainly used for drilling metals and our 4mm drill bit is therefore also excellently suited for machining a wide range of metals and alloys. Starting with our aluminium composite panels with thin top layers of aluminium, through solid aluminium panels, brass, copper, iron, grey cast iron or malleable cast iron to steel. Even stainless steel can be drilled through with the fine drill. Depending on the material, however, care should be taken to use the correct speed. As the hardness of the material increases, the speed should be reduced to avoid annealing the drill. Additional cooling with cutting oil or drilling paste can significantly extend the life of the drill. In addition, never apply high pressure to the drill tip when drilling, so that the drill can work its way through the metal without being damaged.

WARNING: Drilling with the impact drill function activated can damage the drill bit, so this function should always be deactivated when drilling with HSS metal drills.

Additional Information

Additional Information

Delivery TimeDispatch within 2-3 working days
MaterialHigh speed steel (HSS)

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