Hilti DX 351 BT, Operating Instructions Manual, Page: 22 / 126

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3. Technical description
The Hilti DX 351BT and DX 351BTG are powder-actuat-
ed fastening tools for driving X-BT threaded studs into
steel.
The tool works on the well-proven piston principle and
is therefore not related to high-velocity tools. The pis-
ton principle provides an optimum of working and fas-
tening safety. The tool works with cartridges of 6.8/11
caliber.
Piston return and cartridge transport is fully automatic.
This permits fastenings to be made very quickly and
economically with nails and threaded studs.
As with all powder-actuated tools, the tool, magazine,
fastener program and cartridge program form a “tech-
nical unit”. This means that optimal fastening with this
system can only be achieved if the fasteners and car-
tridges are specially manufactured for it, or products of
equivalent quality, are used. The fastening and applica-
tion recommendations given by Hilti are only applicable
if these conditions are observed.
The tool features 5-way safety – for the safety of the
operator and bystanders.
The piston principle
The energy from the propellant charge is transferred to
a piston, the accelerated mass of which drives the fastener
into the base material. As approximately 95 % of the
kinetic energy is absorbed by the piston, the fastener is
driven into the base material at much reduced velocity
(less than 100 m/sec.) in a controlled manner. The dri-
ving process ends when the piston reaches the end of
its travel. This makes dangerous through-shots virtual-
ly impossible when the tool is used correctly.
1
2.1 Signal words
-WARNING-
The word WARNING is used to draw attention to a poten-
tially dangerous situation which could lead to severe
personal injury or death.
-CAUTION-
The word CAUTION is used to draw attention to a poten-
tially dangerous situation which could lead to minor per-
sonal injury or damage to the equipment or other prop-
erty.
-NOTE-
Used to draw attention to an instruction or other useful
information.
2.2 Pictograms

The numbers refer to the illustrations. The illustra-
tions can be found on the fold-out cover pages. Keep
these pages open while you read the operating instruc-
tions.
In these operating instructions, the designation “the
tool” always refers to the DX 351 BT/BTG powder-actu-
ated tool.
Location of identification data on the tool
The type designation and the serial number are printed
on the type plate on the tool. Make a note of this infor-
mation in your operating instructions and always refer
to it when making an enquiry to your Hilti representa-
tive or service department.
Type: DX 351 BT/BTG
Serial no.:
Warning signs
General
warning
Warning:
hot surface
Read the opera-
tion instructions
before use
Return waste
material for
recycling
Obligation signs
Wear eye
protection
Wear a
safety helmet
Wear ear
protection
Symbols
2. General information
Printed: 20.08.2013 | Doc-Nr: PUB / 5069824 / 000 / 02