| Heller Hammer Drill Bit (Made in
Drills for construction
Product safety and user protection are of
paramount importance to Heller. This maxim is expressed by the quality and utmost reliability of products for
practical drilling. Heller emphasises the convincing quality of its products under the label "Quality for
The certified and externally monitored manufacturing process
ensures adherence to the most stringent safety requirements. The exclusive use of selected high-grade steel
and tungsten carbide, coordinated with highly automated, computer-controlled production plants ensures the
highest technological standard and highest service life of Heller drills.
Certified & safe with PGM
products can display the certificate of the independent Prüfgemeinschaft Mauerbohrer e.V. (PGM - Masonry Drill Bit
Testing Association), which defines the highest requirements for a safe drill hole – anchor combination. The PGM
uses monitoring and testing procedures to ensure that users are only offered drills which are coordinated for use
with approved anchors. Only a few authorised dealers worldwide are entitled to exhibit this seal, which every user
of hammer or percussion drills has undoubtedly seen before. Drills with this symbol uphold what many others
promise: Geometrically accurate holes that offer maximum purchase of the anchor and maximum safety for the
What is PGM?
Any user of hammer drill bits should know this
Similar to the German TÜV badge which stands for safety of an
automobile, the PGM-mark on the hammer drill bit guarantees a high-quality product manufactured under
controlled and certified conditions.
Hammer drill bits bearing this mark keep the promise which others
only claim to offer: Geometrically exact holes giving a firm support to the anchor fixing and maximum safety
to the user. The Deutsches Institut für Bautechnik (DIBt), responsible for the Technical Approval of anchors,
prescribes the use of hammer drills bits only with the PGM-mark.
Otherwise an individual and costly test is required for the
You should be aware: The use of poor hammer drill bits without
PGM-mark, which do not come up to the parameters of the DIBt, could be responsible for the failure of anchor
fixings, particularly in safety critical applications.
Protect yourself against possible problems and claims for
compensation which could result from the product liability law. In the event of a claim also the distributor
could be held responsible, if the manufacturer of importer of a poor hammer drill bit without PGM-mark can
not be identified.
Only 14 manufacturers world-wide are authorized to label their
products with this mark. Heller is approved with either the number “46”, “56” or
The PGM-mark guarantees:
through vibration monitoring
Heller is the
first manufacturer specialising exclusively in drill bits to test its products in an independent institute for the
adverse effects of drilling vibration. If a rotary hammer is integral to the application, it can be expected that
so-called “hand-arm vibration” could have some form of long term effect on the users health. The “EU Vibration
Directive 2002/44/EC” aims to help, in that it stipulates the maximum vibration to which users may be exposed.
Low-vibration power tools are called for in addition to low-vibration techniques – but low-quality drill bits can
also have an adverse effect. Low cost, poorly designed drill bits can reserve the effect of low vibration power
tools. Heller drill bits demonstrated optimal effectiveness and extremely low vibration in the practical tests. In
fact, they even distinctly reduced vibration.
Hand-arm vibration is vibration transmitted from work processes into workers’ hands
and arms. It can be caused by operating hand-held power tools, such as road breakers, and hand-guided equipment,
such as powered lawnmowers, or by holding materials being processed by machines, such as pedestal
The EU has installed some new regulations for end user protection –
especially on the topic of hand-arm vibration, which has caused some specific reactions in different
countries so far:
The Council of
Ministers and the European Parliament adopted a joint text for a Physical Agents
(Vibration) Directive regarding exposure of workers to the risks arising from
vibration on 21 May 2002.
The Directive was published as Directive 2002/44/EC on the minimum
health and safety requirements regarding the exposure of workers to the risks arising from vibration and has
now come into force. Member States have to implement the Directive.
What kinds of tools and equipment can cause ill health from
There are hundreds of different types of hand-held power tools and
equipment which can cause ill health from vibration. Some of the more common ones
cut-off saws (for
power hammers and
What are the early symptoms?
Identifying signs and symptoms at an early stage is important. It
will allow the employer, to take action to prevent the health effects from becoming serious for the employee.
The symptoms include any combination of:
tingling and numbness in the
not being able to feel things
loss of strength in the
the fingers going white (blanching)
becoming red and painful on recovery (particularly
in the cold and wet, and probably only in the tips at first).
For some people, symptoms may appear after only a few months of
exposure, but for others they may take a few years. They are likely to get worse with continued exposure to
vibration and may become permanent.
Duratec hardening for
stable drill geometry
Control & reliability with the Heller
and user protection are paramount at Heller.These policies translate to high-quality products that are absolutely
reliable in use. The “Quality for Professionals” label is Heller’s hallmark of superior product quality. The
certified and externally monitored manufacturing process means that products meet stringent safety requirements.The
use of only select highquality steels and tungsten carbide inserts, customised on highly automated,
computer-controlled systems, guarantees that Heller drill bits conform to the state of the art and have the maximum
Tungsten carbide cutting
The innovative, patented Heller
tungsten carbide cutting edges are optimised for the toughest applications in concrete & stone.
Even concrete reinforcements pose no problem for the uncompromising tungsten carbide cutting edges.
A cutting tungsten carbide profile and additional grinding areas make for extremely fast advance.
The integrated protruding tips ensure ideal starting and perfect
are manufactured using the grinding or milling technique. They are ground from the whole piece.
This ensures accuracy of the spiral line. The spiral outside and inside diameter are adhered to
exactly. The advantages in use are quieter operation and continuous removal of
Patented spiral forms guarantee
– for example, by means of an alternatively narrow and wide back edge – optimum removal of
dust without any blow-outs. Extremely high speed with ideal transmission of impact energy
thanks to computer-aided design. In addition, Heller hammer bits are outstanding for quiet,
The special technique of
hardening by blasting makes for the perfect surface finish: the probability that a Heller
hammer bit will break under very high loads is extremely low – even on impact with
reinforcements. Ideal, especially with long dimensions: HST hardening guarantees high bending
flexibility without breaking.
Every Heller drill bit is subjected to
a strict true-running test at the end of production. In the event of deviations from the setpoint,
the hammer bits are adjusted to the correct measurement. Computer-controlled sensors detect
deviations to the micrometre. Special rams then bring the bit into the exact true-running range.
The advantages for the user are greater precision of diameter and depth of the drill hole and less
vibration during work.
Use of hammer
Hammer bits are recommended for drilling holes in brickwork and
concrete with fast and reliable results. For the proper installation of components, it is necessary
to use drill bits from a certified manufacturer. Using drill bits from monitored production is the
only way to guarantee that the bore area will not be exceeded and that consistently good results
will be achieved. Bits with too much true-running deviation or too high tolerances in the tungsten
carbide tip can result in drill holes with not enough grip, for instance, for an anchor. In extreme
cases, the installed elements will become loose and cause severe damage. It is therefore
recommended that you only use drill bits that have been manufactured in accordance with the
guidelines of the Prüfgemeinschaft Mauerbohrer (PGM), an independent institute. You can recognise
this by the PGM quality mark.
Heller hammer bits can even withstand impacts with reinforcements.
But we recommend you use a detector to check the wall for reinforcements before beginning to drill
and only to drill holes in the pure masonry. Reinforcements are there for structural reasons and
should not be cut if at all possible. If this cannot be avoided for design reasons, a structural
engineer must be consulted beforehand.
Checking for pipes
We advise you to check the area around the drill hole for pipes and
cables before starting to drill. Cables and pipes usually run up or down perpendicular to the
socket or fitting. For that reason, we recommend you do not drill directly above or below a socket
or fitting. In the case of through-drilling, you should check the structure of the opposite side of
the wall. It is essential to use special detectors.
We recommend you lubricate the shank end of the drill bit with thread
grease before attaching it to the drill chuck. This will extend the service life of the hammer
Before installing an anchor, it is essential to remove material
residue from the drill hole to ensure optimum grip for the anchor.
The SDS adapter is available in various
designs for power drills. Made to fit the different bit diameters, there is the most popular
SDS-plus adapter with a crosssection of approx. 10 mm and the SDS-max adapter with a cross-section
of approx. 18 mm. The SDS adapter general has two functions: Locking: The bit/chisel locks by means
of opposite recesses running lengthwise in the tool, into each of which a ball, integrated in the
drill chuck, engages. Torque: The torque is transmitted via grooves in the bit/chisel, in which
lengthwise ridges in the drill chuck engage. With axial transmission of the hammer percussion, the
balls descend and the ridges slide into the grooves.
Drills with a spline
adapter are also used. These facilitate drill holes within a diameter range of approx. 12 mm to 38
Minimum lifetime expectation in drilling
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