Hammer Drill Bits

Generally, the trend from the percussion drilling is leading to the popularity of the hammer drill. Hammer drills are super fit for rough and tough materials, ie concrete, clinker, and natural stone. They come with rotary hammers used where more impact energy is transmitted than with hammer drill machine, and they drill effectively. For this purpose they have a special shaft (up to 16 mm bore diameter usually 'SDS Plus') that matches the hammer. Naturally hammer drills, etc. are also suitable for all kinds of stone, hollow stone, masonry, possibly the hammer function is turned off during drilling. Hammer drills can percussion drills therefore replace completely! As with all our tools you get low prices due to the high purchasing volumes. Please also use the tips for drilling.

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Drilling can be seen as a symbol for the "male", and hammer drilling even more! The drills industry advertises martial figures that look like bikers relying on their machines, and the names of many products have a long list of superlatives. But what drills are required for greening walls? Here criteria is mentioned that apply for diameters up to 16 mm and continuous drill lengths.


P.S . Of course we are very happy when women also buy our drills - and use it!

2-edge, 3-edge etc.

Yes, the number of the bit edges plays a big role, at least in the drill advertisements which have the motto: The more edges, the better. But this logic denies the classic 2-edge which looks like a percussion drill, still far behind 3 edges and is thought of as the loser. But this depends on one's point of view: 2 edge bits still bore fastest! Since the more edge surfaces a drill has, the slower it becomes. 3 edges uses more energy, generates more friction and warmth and becomes susceptible for heat up, thus wears down faster. When the '3-edge bit' arrived to us, nevertheless, it did not strike us in a negative way, but with the 4-edge definitely! The professionals on the construction sites of tunnels, blocks of flats etc. which bore daily hundreds of holes rejected the new drill quickly. Four across arranged edges - this was too much a friction! The remaining stocks of these first 4-edgers float around still today on the Internet, as a "special deal" on various on-line shops...

The cross-shaped four edge bit although is still popular, but it is not more ' efficient ', because two of the four cutting edges are wider and longer and they cut and pound really, while the other two support the drilling process only as a 'minor cut' and rather do very little on the borehole wall.  And with regard to the number of cutting edges, some providers still even think .more edges!  Somehow the bit's tip is considered and sold as a separate cutting edge, so even 'five edges' are only really highly modified two edger bits!

Head and shaft

... Must be joined together, and usually this is done by soldering. The cutter body from 'hard metal' (tungsten and others), usually in the form of a small plate is inserted into the prepared grooves of the drill shaft and surrounded there at high temperature with liquid metal (brass or Bronze lot). After cooling, the compound is then hard and united. The trend went here for high temperature soldering at over 1,000 degrees, such drills can sometimes be heated to several hundred degrees out without the soldering gets soft and the hard metal plate becomes loose.

A new trend for very heavy hammer drills (over 5 kg) are mono block cutting (solid carbide head): Here a massive carbide body is butted to the drill shaft and thermally fixed, for example by 'friction welding'. However, the junction of the two materials must be matched to one another, so that there is 'the right chemistry'. This means that the hard metal body may be not quite as hard in this lower part and loses grip - on the lateral edges - after wear resistance.  Such hammer drill bits can wear out in the area of the lateral cut of edges rather and then possibly drill inaccurately.

Shaft and Spiral

The shank of each hammer drill bit has helical coil (spiral), which convey the debris as an auger from the hole. The geometric shape of the helix can be optimized with respect to width, depth and cross-sectional. It is also important the number on the coil. Normally, each edge of the hammer drill bit has an edge and a spiral, so -two edges, two spirals, three-edge bit- three spirals etc . With four spirals, however it may be tight, because they can no longer be so deeply cut into the drill shaft, then the shaft doesn't have much mass left, and the stability suffers. And spirals with too small a cross section entail problems for boring dust, the increased shunting of the drill and it can then get hot.

Particularly for very long hammer bits helps a 'core strengthening' of the stem, to still be sufficiently stable during drilling.

Hammer Drill Bits at FassadenGrün

Which bits will you receive from FassadenGrün? Hammer drill bits are needed for drilling through walls completely, so then cables can be pulled through, or metal anchors placed, that spread apart in greater depth. Trellises on facades are usually less deeply attached, even in order to preserve the building materials, but also to avoid thermal bridges. Precise, circular dowel holes are needed! It sounds trite, but is not self-evident and doesn't play a role with other drilling jobs. Wayward, oval holes distribute the expansion pressure of the anchor not equally in all directions, here there may be a loss of a holder or even crack formations. The hammer drill bits offered by Fassaden Grün have a centered point. This optimizes the drilling, reduces spalling of material as well as the 'waywardness' of the drill and gives continued leadership in through the hole.

The number of the edges is also important: 2-edge and also supra - modern 4-edge incline, during the drilling, rather to hit laterally and 'break off', while 3-edge steadily support themselves in three directions like a Mercedes star in the circle. The holes remain precise and don't become too big, the raw plugs sticks well and ' does not spin '. Besides, three edges works very nicely with less vibrations which spares hands and arms from excess strain.

For greening growth aids: Less is more - three-edge bit instead four! Wherever anchors are needed, you therefore can find FassadenGrün's high quality three-edge in ProfiPlus-quality, individually or in cassette HB 44444. The 16 mm sizes are individually- HB 16210 and as inexpensive short version- HB 16160 available. If using composite mortar bonding as with some heavy construction, the quality of the holes is not as crucial. Here two cheaper four edger HB 16310 and HB 16450 are listed in professional quality, especially for long lengths (in some wall insulation).

All Hammer drills bits at facade Green also break reinforced concrete. So you can pierce steel reinforcement without changing direction!

Drilling with hammer drill bits
Simple Two-edge carbide bit
Simple Two-edge carbide bit
Three edge Hammer drill bit type 'TriJet' of Heller
Three-flute cutter hammer drill bit, "Trijet" of Heller
Contemporary four edge bit 16 mm, the horizontal main cutting edge and the two (shorter and shallower) side edges are visible. Type: 'Zentro' of DreBo
Hammer drill bit - four edged "Zentro" of DreBo
Four edge-hammer drill bit 16 mm with main cutting edge (1 carbide platelets) and 2 other separate cutting, Type 'Speed X' Bosch / Hawera
Four edge hammer drill bit "Speed X" of Bosch / Hawera
Hammer drill bit 16 mm with solid carbide head, Five edge, Type 'Power Plus LSP' Bosch / Hawera
Hammer drill bit "Power LSP Plus" of Bosch / Hawera
Hammer drill bits to 12 mm, come along with a practical, space-saving 'QuadroPack'. These sliding sleeves with grid lengths mechanism can be well stowed away for use in the hammer drill case.
Hammer drill bits in plastic cartridge