QUALITY STANDARD GUIDELINES
| Heller Hammer Drill
Bits (Made in Germany)
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
Certified & safe with PGM
Heller's 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
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 respective bit.
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:
User-protection through vibration
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.
What is hand-arm 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 grinders.
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
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 vibration?
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 stone etc);
power hammers and chisels etc.
What are the early
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 hands;
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
& reliability with the Heller quality seal
Product safety 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 service
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
The spirals 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, low-vibration
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
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 drill.
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 mm.
Minimum lifetime expectation in drilling
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