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Percussion Drill Bits

Percussion-impact drill bits stand between universal drill bits and hammer drill bits and are used in FassadenGrün's product line with the purpose of producing perfect dowel/rawl plug holes using an impact drill. Percussion drills usually have a round shank; they can transfer the vibrations generated by the drilling machine into hard materials, so that drilling in concrete, clinker-brick, and medium-hard natural stone is possible. In addition, they can be used as a normal rotating drill, without percussion... then usually for normal, plastered masonry. Please also refer to the tips on drilling as needed.

>>> Price list

 

Why buy new drill bits?

Percussion drill bits are 'two edged' and always work with a front-soldered, double-edged carbide insert, formerly called "WiDia" (hard 'like diamond"). Every handyman has such bits, so why buy a new one? 

For holders of facade greenery, perfect drill holes are required (except when applied with a bonding mortar). For this reason we recommend new, sharp drill bits! The holes should not be oval but perfectly round, so that the expansion pressure of the plug is evenly distributed in all directions. Furthermore, the holes should be neither too large nor too small. Unsharp drills often produce larger holes due to missing the centre; worn drill bits also produce rawl plug holes that are too narrow. In both cases, there are problems when you mount the holder: Either the rawl plugs find no hold in the bore and 'spin,' or they sit too tightly and the holders and can be barely screwed.

Our appeal: Buy new suitable bits for your climbing aids!

 

 

Regrinding of percussion drills

The two carbide cutting edges of percussion drills can be re-sharpened by hand, and optimally, on special grinding wheels. A little bit is ground away at the level of the carbide plate. However, this only makes sense with rawl plug holes if the width of the carbide plate has not yet worn out significantly below the drill size (see photo).

Concrete drill bits, stone drill bits, and masonry drill

'Hammer,' 'percussive,' or 'impact' drilling means only that the drill bits are suitable for percussive drilling, i.e. that they tolerate the activation of the impact/percussive function. According to the suitability for different wall types, they are subdivided again: concrete drill bits are extremely resistant, high-quality, and usable in all types of stone, while masonry drill bits are usually less expensive, less resilient, and used in softer material. Their carbide plate is thinner and not so massively supported in the drill shank (see photos). There are even special masonry drill bits for bricks and roof tiles which can not tolerate 'impact/percussion' and are therefore not impact drill bits. 'Masonry drill' again is a very general term for longer drills, e.g. for cable glands (bushing/connectors).

Percussion drill bits from FassadenGrün

FassadenGrün offers a "hobby"-quality line of percussion drill-bits: with these stone drill bits, you can also refill your existing drill cassettes or fill gaps where bits are missing. For higher demands, we offer a "professional" cassette, in which the concrete drill bits drill into the hardest surfaces with a correspondingly powerful machine (750 watts). A 16 mm masonry drill bit for insulation completes the product line. With each climbing aid kit and also for each individual wall bracket, you will find the necessary drill diameter for mounting.

Limits of use

Hammer (Percussion/Impact) drill bits reach their limits with materials such as reinforced concrete, hard-fired (historical) clinker bricks with inclusions and sintering points, and very hard natural stone such as granite. It may be necessary to pre-drill with a smaller diameter, or a machine with more power may need to be used. Otherwise hammer drills and consequently ''hammer drill bits'' with SDS-Plus shank are required. Am impact/hammer drill is unsuitable for special facades (wood/plastic/etc..) A universal drill is used here.

New professional concrete drill bit with soldered carbide plate (Hawera / Bosch)
New concrete drill bit
This 16 mm percussion bit is worn out; it can drill only 15.5 mm.
Attrition of a percussion drill bit
Hobby masonry drill bit (left) and Pro concrete drill bit (right) in comparison
Stone drill bit and concrete drill bit
The platelet (WiDia-- German abbreviation for 'hard like diamond') of the concrete drill bit on the right is noticeably thicker and stronger than the masonry drill bit to the left
Carbid edge "WiDia" (German abbreviation for "like diamond")