HILTI DX 351 Powder Actuated Tool Instruction Manual

: June 17, 2024
: HILTI

Table of Contents

DX 351 Powder Actuated Tool
Product Information
Specifications
Description of Main Parts
Safety Precautions
1. Basic Safety Instructions
1.1 Only use Hilti cartridges or cartridges of equivalent
1.2 Use as intended
- Product Usage Instructions
6. Operation
- FAQ
Q: Can I use cartridges from other brands in the DX 351
Q: What is the intended use of the DX 351 tool?

DX 351 Powder Actuated Tool

Product Information

Specifications

Model: DX 351
Tool components:
- Item no. 331010
- Item no. 331203
- Item no. 331027
- Item no. 331158
- Item no. 331045
- - These parts may be replaced by the user/operator

Description of Main Parts

The DX 351 powder-actuated tool consists of the following main
parts:

Safety precautions
General information
Technical description
Accessories, cartridges and fasteners
Technical data
Operation
Service (changing the piston and piston brake)
Care and maintenance
Assembly
Troubleshooting
Disposal
EC declaration of conformity (original)
CIP approval mark
Health and safety of the user

Safety Precautions

1. Basic Safety Instructions

In addition to the safety precautions listed in the individual
sections of these operating instructions, the following points must
be strictly observed at all times:

Only use Hilti cartridges or cartridges of equivalent
quality
Use as intended
Properly maintain and inspect the tool
Protective equipment
Safe working conditions
Proper handling and storage
Do not modify the tool

1.1 Only use Hilti cartridges or cartridges of equivalent

quality

The use of cartridges of inferior quality in Hilti tools may
lead to build-up of unburned powder, which may explode and cause
severe injuries to operators and bystanders. Cartridges must
either:

Be confirmed by their supplier to have been successfully tested
in accordance with EU standard EN 16264
Carry the CE conformity mark (mandatory in the EU as of July

1.2 Use as intended

The tool is designed for professional use in fastening
applications in construction where specially-designed nails,
threaded studs, and composite fasteners are driven into concrete,
steel, and sand-lime block masonry.

Product Usage Instructions

6. Operation

To operate the DX 351 powder-actuated tool, follow these
steps:

Prepare the tool for operation by inserting a cartridge strip
into the magazine.
Load the fastener into the tool.
Position the tool on the desired surface and align it with the
target location for fastening.
Hold the tool firmly and press the tool against the surface to
ensure proper contact.
Press the trigger to activate the tool and drive the fastener
into the surface.
Repeat steps 2-5 for additional fastening tasks.

FAQ

Q: Can I use cartridges from other brands in the DX 351

tool?

A: It is recommended to only use Hilti cartridges or cartridges
of equivalent quality in the DX 351 tool. Using cartridges of
inferior quality may lead to safety hazards.

Q: What is the intended use of the DX 351 tool?

A: The DX 351 tool is designed for professional use in fastening
applications in construction, specifically for driving
specially-designed nails, threaded studs, and composite fasteners
into concrete, steel, and sand-lime block masonry.

DX 351

Bedienungsanleitung

de

Operating instructions

en

Mode d’emploi

fr

Istruzioni d’uso

it

Manual de instruções

pt

Manual de instrucciones

es

el

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1

¹

µ¸

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2

12

3

4

5

DX 351

321

6

78

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6.1

6.8

8.1

8.8

6.2

6.9

8.2

9.1

6.3

8.3

9.2

6.4

8.4

9.3

6.5

7.2

8.5

6.6

7.3

9.4

8.6

9.5

6.7

7.4

8.7

9.6

7.5

9.6

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ORIGINAL OPERATING INSTRUCTIONS
DX 351 powder-actuated tool

It is essential that the operating instructions are read before the tool is operated for the first time.
Always keep these operating instructions together with the tool.
Ensure that the operating instructions are with the tool when it is given to other persons.

Tool components

Item no.

³ Fastener guide*

· Piston brake (part of fastener guide) » Piston*

en

¿ Piston return spring

331010

´ Piston guide

331203

² Black housing

331027

¶ Piston stopper right

331158

º Piston stopper left

331045

These parts may be replaced by the user/operator

Description of main parts
³ Magazine housing · Nail pusher » Fastener feed delay device ¿ Piston brake (part of fastener guide) ´ Threaded sleeve ² Fastener guide ¶ Piston return spring º Black housing ¾ Trigger µ Handle ¸ Cartridge feeding ¹ Cartridge ejection Grip Aeration slots Power regulation indicator Power regulation wheel Nail detector assy

Contents

Page

1. Safety precautions

17

2. General information

19

3. Technical description

19

4. Accessories, cartridges and fasteners

20

5. Technical data

21

6. Operation

22

7. Service (changing the piston and piston brake) 23

8. Care and maintenance

23

9. Assembly

24

10. Troubleshooting

25

11. Disposal

30

12. Manufacturer’s warranty DX tools

30

13. EC declaration of conformity (original)

30

14. CIP approval mark

31

15. Health and safety of the user

31

1. Safety precautions
1.1 Basic safety instructions In addition to the safety precautions listed in the individual sections of these operating instructions, the following points must be strictly observed at all times.
1.2 Only use Hilti cartridges or cartridges of equivalent quality
The use of cartridges of inferior quality in Hilti tools may lead to build-up of unburned powder, which may explode and cause severe injuries to operators and bystanders. At a minimum, cartridges must either:
a) Be confirmed by their supplier to have been successfully tested in accordance with EU standard EN 16264
NOTE: All Hilti cartridges for powder-actuated tools have
been tested successfully in accordance with EN 16264. The tests defined in the EN 16264 standard are system
tests carried out by the certification authority using specific combinations of cartridges and tools. The tool designation, the name of the certification authority and the system test number are printed on the cartridge packaging.
or
b) Carry the CE conformity mark (mandatory in the EU as of July 2013).
See packaging sample at: www.hilti.com/dx-cartridges
1.3 Use as intended The tool is designed for professional use in fastening applications in construction where specially-designed nails, threaded studs and composite fasteners are driven into concrete, steel and sand-lime block masonry.

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17

3. Manually advance the cartridge strip one cartridge.

Use up the remaining cartridges on the strip. Remove

the used cartridge strip and dispose of it in such a

1.4 Improper use

way that it can be neither reused nor misused.

Manipulation or modification of the tool is not per- Never attempt to pry a cartridge from the magazine

missible.

strip or the tool.

Do not operate the tool in an explosive or flammable Keep the arms flexed when the tool is fired (do not

en

atmosphere, unless the tool is specially approved for such use.

straighten the arms). Never leave the loaded tool unattended.

Use only original Hilti fasteners, cartridges, acces- Always unload the tool before beginning cleaning,

sories and spare parts or those of equivalent quality. servicing or changing parts and before storage.

Observe the information printed in the operating Unused cartridges and tools not presently in use must

instructions concerning operation, care and mainte- be stored in a place where they are not exposed to humi-

nance.

dity or excessive heat. The tool should be transported

Never point the tool at yourself or any bystander.

and stored in a toolbox that can be locked or secured to

Never press the muzzle of the tool against your hand prevent use by unauthorized persons.

or other part of your body.

Do not drive nails into excessively hard or brittle mate-

rials such as glass, marble, plastic, bronze, brass, cop-

per, natural rock, insulation material, hollow brick, glazed tile, thin-gauge sheet metal (< 4 mm), grey cast iron, spheroidal cast iron and gas concrete.

1.8 Temperature Do not disassemble the tool while it is hot. Never exceed the recommended maximum fastener

1.5 Technology This tool is designed with the latest available technology. The tool and its ancillary equipment may present haz-

driving rate (number of fastenings per hour). The tool may otherwise overheat. Should the plastic cartridge strip begin to melt, stop using the tool immediately and allow it to cool down.

ards when used incorrectly by untrained personnel or not as directed.

1.9 Requirements to be met by users The tool is intended for professional use.

The tool may be operated, serviced and repaired only

by authorised, trained personnel. This personnel must

be informed of any special hazards that may be encoun-

1.6 Making the workplace safe Ensure that the workplace is well lit. Operate the tool only in well-ventilated working areas. The tool is for hand-held use only. Avoid unfavorable body positions. Work from a secure

tered. Proceed carefully and do not use the tool if your full attention is not on the job. Stop working with the tool if you feel any pain or discomfort.

stance and stay in balance at all times Keep other persons, children in particular, outside the

1.10 Personal protective equipment

working area.

Before using the tool, make sure that no one

is standing behind or below the point where fasteners

are to be driven.

The operator and other persons in the immediate vicin-

Keep the grip dry, clean and free from oil and grease. ity must always wear approved eye protection, a hard

hat and suitable ear protection.

1.7 General safety precautions Operate the tool only as directed and only when it is in faultless condition. If a cartridge misfires or fails to ignite, proceed as follows: 1. Keep the tool pressed against the working surface for
30 seconds. 2. If the cartridge still fails to fire, withdraw the tool from
the working surface, taking care that it is not pointed towards your body or bystanders.

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2. General information

Piston return and cartridge transport is fully automatic. This permits fastenings to be made very quickly and

2.1 Signal words and their meaning
WARNING: The word WARNING is used to draw attention to a potentially dangerous situation which could lead to severe personal injury or death.

economically with nails and threaded studs. The use of a nail magazine (MX27 or MX32) greatly increases the speed and convenience of fastening with the tool, above all when making large numbers of identical fastenings of all kinds.

CAUTION: The word CAUTION is used to draw attention to a potentially dangerous situation which could lead to minor personal injury or damage to the equipment or other property.

As with all powder-actuated tools, the tool, magazine, fastener program and cartridge program form a “technical unit”. This means that optimal fastening with this system can only be achieved if the fasteners and car-

en

2.2 Pictograms

tridges are specially manufactured for it, or products of equivalent quality, are used. The fastening and applica-

Warning signs

Symbols

tion recommendations given by Hilti are only applicable

if these conditions are observed.

General warning
Obligation signs

Warning: hot surface

Read the operation instructions
before use

The tool features 5-way safety for the safety of the operator and bystanders.
The piston principle
1

Wear eye protection

Wear a safety helmet

Wear ear protection

The numbers refer to the illustrations. The illustrations can be found on the fold-out cover pages. Keep these pages open while you read the operating instructions.

In these operating instructions, the designation “the tool” always refers to the DX 351 powder-actuated 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 information in your operating instructions and always refer to it when making an enquiry to your Hilti representative or service department.

Type: DX351

Serial no.:

3. Technical description
The tool is designed for professional use in fastening applications where specially-designed nails, threaded studs and composite fasteners are driven into concrete, steel and sand-lime block masonry.
The tool works on the well-proven piston principle and is therefore not related to high-velocity tools. The piston principle provides an optimum of working and fastening safety. The tool works with cartridges of 6.8/11 caliber.

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 driving process ends when the piston reaches the end of its travel. This makes dangerous through-shots virtually impossible when the tool is used correctly.
The drop-firing safety device 2 is the result of coupling the firing mechanism with the cocking movement. This is designed to prevent the Hilti DX tool from firing when it is dropped onto a hard surface, no matter at which angle the impact occurs.
The trigger safety device 3 ensures that the cartridge cannot be fired simply by pulling the trigger only. The tool can be fired only when fully depressed.
The contact pressure safety device 4 requires the tool to be fully depressed with a significant force. The tool can be fired only when pressed fully in this way.
In addition, all Hilti DX tools are equipped with an unintentional firing safety device 5 . This prevents the tool from firing if the trigger is pulled and the tool then pressed against the work surface. The tool can be fired only when it is first pressed correctly and the trigger then pulled.

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19

2
en
3

4
5
2 1

4. Accessories, cartridges and fasteners

Cartridges
Ordering designation
6.8/11M white 6.8/11M green 6.8/11M yellow 6.8/11M red

Colour code
White Green Yellow Red

Power level
Extra low Light Medium Heavy

Prevention of misuse: When the piston tip is worn or damaged (see 7.), never try to grind the tip in order to re-use the piston. This may
cause serious damage to the tool and will adversely affect fastening quality. Please refer to the table below for the right fastener guide/piston/fastener combination. Use of the wrong com-
bination may result in damage to the tool.

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Fastener guide

Piston type

Elements

Magazine X-MX27

Magazine X-MX32

X-P8S-351

X-MX27:

X-C20-27MX

X-U20-27

Length: 160 mm

X-U15MXSP

Weight: 93 g

X-MX32:

X-C20-32MX

en

X-U20-32MX

X-U15MXSP

;0;

Standard fastener guide X-FG8S-351 ME fastener guide X-FG8ME-351 Narrow access fastener guide X-FG8L-351

X-P8S-351 Length: 160 mm Weight: 93 g
X-P8L-351 Length: 182 mm Weight: 103 g

X-C22-47P8 X-C20THP X-C22-27P8TH X-C27-C52P8S36 X-HS M6/8/10 XU19-32 X-HS W6/8/10, XU19-27 X-FB-C27 X-FB-U22 X-RH1/4-U27P8 X-M6, X-EM6 / X-F7, X-EF7 (up to max. 47 mm/1.85) X-M8, X-EM8
X-CF 20-47 P8 X-C20-47P8 X-U16-47P8 X-CC U16-27 X-CC C27-32 X-HS M6/8/10 U19-32 X-HS W6/10 U19-27

5. Technical data

DX 351

Weight:

2.2 kg (4.8 lb) 2.4 kg (5.3 lb) with magazine

Tool length:

404 mm (15.9)

Nail length:

Max. 47 mm (1.85)

Cartridge:

6.8/11 M (27 cal. short) white, green, yellow, red

Compression stroke:

59 mm (2.3)

Compression force with magazine: Compression force with standard fastener guide:

130 N 100 N

4 cartridge power levels, click-stop regulation thumbwheel

Nail magazine Weight : Nail length: Magazine capacity: Recommended max. fastener driving frequency:

MX 27

MX 32

0.16 kg (0.35 lb)

27 mm (1)

32 mm (11/4)

10 nails

700/h with white, green or yellow cartridges 500/h with red cartridges

Right of technical changes reserved

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21

6. Operation
WARNING
en
The base material may splinter when a fastener is driven or fragments of the cartridge strip may fly off.
Flying fragments may injure parts of the body or the eyes.
Wear approved eye protection and a hard hat (users and bystanders).
CAUTION
The nail or stud is driven by a cartridge being fired.
Excessive noise may damage the hearing.
Wear ear protection (users and bystanders).

Guidelines for optimum fastening quality
NOTE These application recommendations must always be observed. For more specific information, refer to the Hilti Fastening Technology Manual, which is available from your local Hilti organisation.
Minimum requirements

B

A

C

Fastening on steel

A = min. edge distance

= 15 mm (5/8″)

B = min. spacing

= 20 mm (3/4″)

C = min. base material thickness = 4 mm (5/32″)

B

A

ET C

WARNING
The tool could be made ready to fire if pressed against a part of the body (e.g. hand)..
This could cause a nail or piston to be driven into a part of the body.
Never press the muzzle of the tool against parts of the body.

Fastening on concrete

A = min. edge distance

= 70 mm (23/4″)

B = min. spacing

= 80 mm (31/8″)

C = min. base material thickness = 100 mm (4″)

Nail lengths (These are only examples, find specific information in the Hilti Fastening Technology Manual

WARNING

Under certain circumstances, the tool could be made ready to fire by pulling back the magazine, fastener guide or the fastener by hand.
When in the “ready to fire” state, a fastener or the piston could be driven into a part of the body.
For this reason, never pull back the magazine, fastener guide or fastener by hand.

ET
Fastening on concrete Penetration depth (ET): 2227 mm, (7/8″1″)
ET
Fastening on steel: Penetration depth (ET): 12 ± 2 mm, (1/2″ ± 1/16″)

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a6.a1 Loading the single-fastener tool

3. Press the single fastener guide onto the piston guide,

Insert the fastener flat end (head) first until the washer then screw the threaded sleeve on until it engages.

is held in the tool.

a6.a2 Inserting the cartridge strip

Load the cartridge strip narrow end first by inserting it

into the bottom of the toolgrip until flush. If the strip has been partly used, pull it through until a live cartridge is

7. Service (changing the piston and

in the chamber.

piston brake)

en

a6.a3 Power regulation Adjust the driving power by turning the regulating wheel. 1= minimum power 2= medium power 3= maximum power Select the cartridge power level and power regulation setting to suit the application. If you have no previous experience of this application, always begin with the lowest power level.
a6.a4 Using the single-fastener tool When fastening, position the tool perpendicular to the work surface, press down and then pull the trigger.
WARNING Re-use of fasteners:
If the first attempt to drive a fastener fails, so not use or redrive the same fastener a second time. Do not drive fasteners into holes: Driving fasteners into existing holes is not permissible unless specifically authorized by Hilti. Fastener driving rate: Do not exceed the maximum fastener driving rate.

a7.a1 Check that the tool is not hot.
a7.a2 Remove the cartridge strip from the tool. Unscrew the fastener guide or magazine.
a7.a3 Turn the black housing one whole revolution (360° counter clockwise). This will release the piston stoppers so you can remove the piston from the tool.
a7.a4 Typical wear of piston. Check if piston is chipped or damaged. Replace if significant chipping or damage has occurred.
a7.a5 If the piston sticks in the piston guide, the entire piston guide unit must be removed (see section «Care and maintenance»). Push out the piston through the cartridge chamber. Note: Do not grind the piston. If the piston is made shorter the tool will be damaged.

a6.a5 Pull the cartridge strip out of the tool.
a6.a6 Fitting the magazine 1. Unscrew the single fastening fastener guide, thread-
ed sleeve and pull the fastener guide out. 2.Press the nail magazine onto the piston guide, then
screw the threaded sleeve on clockwise until it engages.
a6.a7 Loading the magazine tool 1. Unscrew the single fastening fastener guide, thread-
ed sleeve and pull the fastener guide out. 2. Press the nail magazine onto the piston guide, then
screw the threaded sleeve on clockwise until it engages.
a6.a8 Using the magazine tool When fastening , position the tool perpendicular to the work surface, press down and then pull the trigger. Note: If the nail magazine is empty, the tool cannot be fired.
a6.a9 Conversion to single-fastening tool (changing the equipment)
1. Pull the cartridge strip out of the tool. 2. Open the magazine by pulling the nail pusher down
until it locks, then take out the nail strip. Unscrew the magazine threaded sleeve.

8. Care and maintenance
When this type of tool is used under normal operating conditions, dirt and residues build up inside the tool and functionally relevant parts are also subject to wear. Regular inspections and maintenance are thus essential in order to achieve reliable operation. We recommend that the tool is cleaned and the piston and piston brake are checked at least weekly when the tool is subjected to intensive use, and at the latest after driving 8,000 fasteners.
Care of the tool The outer casing of the tool is manufactured from impactresistant plastic. The grip comprises a synthetic rubber section. The ventilation slots must be unobstructed and kept clean at all times. Do not permit foreign objects to enter the interior of the tool. Use a slightly damp cloth to clean the outside of the tool at regular intervals. Do not use a spray or steam-cleaning system for cleaning.
Maintenance Check all external parts of the tool for damage at regular intervals and check that all controls operate properly. Do not operate the tool when parts are damaged or

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23

when the controls do not operate properly. If necessary, 9. Assembly
have the tool repaired at a Hilti service centre.

Servicing the tool

a9.a1 Put the black housing onto the piston guide.

The tool should be serviced if: 1. Cartridges misfire 2. Fastener driving power is inconsistent

a9.a2 Pull up the black housing against the spring and hold it with your hand.

en

3. If you notice that: contact pressure increases,

trigger force increases,

power regulation is difficult to adjust (stiff),

a9.a3 Insert the complete unit so that the marks on the piston guide and the marks on the metal housing are in alignment.

the cartridge strip is difficult to remove.

a9.a4 Push in the stoppers when the piston guide is in

CAUTION while cleaning the tool:

far enough, so that the stoppers fit into the sleeve on

Never use grease for maintenance/lubrication of tool the side of the piston guide openings.

parts. This may strongly affect the functionality of the tool. Use only Hilti spray or such of equivalent quality. a9.a5 Release the black housing and screw it on one or Dirt from DX tool contains substances that could be two turns.

endangering your health. Do not breath in the dust from cleaning Keep dust away from food Wash your hands after cleaning the tool

a9.a6 Insert the piston all the way back (the piston can be inserted anytime before the last whole turn) and finish screwing on the black housing until it engages.

CAUTION
The tool can get hot while operating.
You could burn your hands. Do not disassemble the tool while
it is hot. Let the tool cool down.

a9.a7 Press the single fastener guide or magazine into the piston guide, then screw the threaded sleeve on until it engages.

Warning: The tool must be unloaded before carrying out care and maintenance.

a8.a1 Remove fastener guide or magazine

a8.a2 Service Unscrew the black housing counter clockwise fully.

a8.a3 Push back the piston guide with the palm of the hand to release the piston stoppers and then remove the complete unit.

a8.a4 Remove the black housing from the piston guide.

a8.a5 Clean the fastener guide or magazine and the piston.

a8.a6 Clean the cartridge transport.

a8.a7 Clean the piston guide inside and outside (backside of the piston guide and the spring area.) and lubricate it on the outside. Clean in the cartridge chamber and the power regulation hole at the end-face of the piston guide..

a8.a8 Clean the inside of the housing. Slightly lubricate the inside.

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10. Troubleshooting
Fault Cartridge not transported

Cause Damaged cartridge strip Carbon build up
Tool damaged

Possible remedies
Change cartridge strip
Clean the cartridge strip guide- en
way (see 8.6)
If the problem persists: Contact Hilti Repair Centre

Cartridge strip cannot be removed

Tool overheated because of high Let the tool cool down and then

setting rate

carefully try to remove the

Tool damaged

cartridge strip

WARNING Never attempt to pry a cartridge from the magazine strip or tool.

If not possible: Contact Hilti Repair Centre

Cartridge cannot be fired

Bad cartridge

Manually advance the cartridge

strip one cartridge

Carbon build-up

If the problem occurs more

often:

WARNING

Clean the tool (see 8.18.8)

Never attempt to pry a cartridge

from the magazine strip or the tool. If the problem persists:

Contact Hilti Repair Centre

Cartridge strip melts

Tool is compressed too long while fastening.
Fastening frequency is too high

Compress the tool only while fastening.
Remove the cartridge strip Disassemble the tool (see
7.17.3) for fast cooling and to avoid possible damage Do not exceed the recommended fastener driving rate

If the tool cannot be disassembled: Contact Hilti Repair Centre

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25

Fault
Cartridge falls out of the cartridge strip
en

Cause

Possible remedies

Fastening frequency is too high
WARNING Never attempt to pry a cartridge from the magazine strip or tool.

Immediately discontinue using the tool and let it cool down
Remove cartridge strip Let the tool cool down Clean the tool and remove loose
cartridge

If it is impossible to disassemble the tool: Contact Hilti Repair Centre

The operator notices:

Carbon build-up

increased contact pressure increased trigger force power regulation stiff to adjust cartridge strip is difficult to
remove

Clean the tool (see 8.18.8)
Check that the correct cartridges are used (see 1.2) and that they are in faultless condition.

Varying depths of penetration

The tool is dirty (carbon buildup)

Clean the tool (see 8.18.8)
Check piston, replace if necessary

Trigger cannot be pulled

Tool not fully compressed Safety mechanism activated
because: Magazine not loaded Plastic debris inside the
magazine Incorrect piston position Nail incorrectly positioned in
magazine

Release the tool and fully compress it again
Load fastener strip Open magazine, remove fastener
strip and plastic debris
If problem persists: Clean the tool (see 8.18.8) Check to ensure that the tool is
assembled correctly

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Fault

Cause

Possible remedies

Piston stuck in magazine fastener Piston damaged

Unscrew the magazine

guide

Plastic debris inside the

Unscrew the black part of the

magazine

housing

en

Excess power when fastening on Check piston and replace if

steel

necessary (see 7.17.5)

Tool fired with high power

Open magazine, remove fastener

without fastener in place

strip and plastic debris

Reduce the power setting

Avoid firing the tool without a

fastener in place

Fastener penetrates too deeply

Fastener too short Driving power too high

Use longer fastener
Reduce power setting Use lighter cartridge

Fastener does not penetrate deeply enough

Fastener too long Driving power too low

Use shorter fastener if permissible
Increase power setting Use heavier cartridge Use a more powerful system
such as the DX 460

Nail bends

Hard and/or large aggregate in concrete
Rebar close to surface of concrete
Hard surface (steel)

Use shorter fastener if permissable
Use a nail with a higher application limit
Change to single fasteners Use an alternative system (spall
stop or DX-Kwik)

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27

Fault Base material is spalling
en

Cause

Possible remedies

High strength concrete Hard and/or large aggregate in
concrete Old concrete

Adjust the power setting Use an alternative system
(DX460 with spall stop or DXKwik)

Nail does not penetrate surface

Driving power too low
Application limit exceeded (very hard surface)
Unsuitable system

Use a higher power setting or heavier cartridge
Use nail with higher application limits
Switch to more powerful system e.g. DX 460

Nail breaks

Driving power too low
Application limit exceeded (very hard surface)

Try higher power setting or heavier cartridge
Use a shorter nail if permissible Use nail with higher application
limits Switch to more powerful system
e.g. DX 460

Wasted (unused) cartridges

The tool is not pressed fully against the work surface

Press the tool fully against the work surface before pulling the trigger

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Fault Piston guide sticks
Nail jams in the magazine

Cause

Possible remedies

The piston is damaged

Unscrew the magazine

Unscrew the black housing

Check the piston and replace if en

necessary (see 7.17.5)

Remains of plastic strip in maga- Open the magazine and remove

zine

the nail strip and any plastic

Driving power too high when dri- remains

ving into steel

Reduce driving power

Firing the tool with high power Avoid firing without a fastener in

without a fastener in place

place

The tool is dirty (carbon build- Clean the tool (see 8.18.8)

up)

2 nails are jammed together in the magazine

Insert the tip of a screwdriver through the furthest forward slot in the magazine and push the nails out

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29

11. Disposal
Most of the materials from which Hilti power actuated tools are manufactured can be recycled. The materials must be correctly separated before they can be recycled. In many countries, Hilti has already made arrangements for taking back your old powder actuated tools for recycling. Please ask your Hilti customer service department or Hilti sales representative for further information. Should you wish to return the power actuated tool yourself to a disposal facility for recycling, proceed as follows:
en Dismantle the tools as far as possible without the need for special tools.
Separate the individual parts as follows:

Part / assembly
Toolbox Outer casing Screws, small parts Used cartridge strip

Main material
Plastic Plastic / synthetic rubber Steel Plastic / steel

Recycling
Plastics recycling Plastics recycling Scrap metal According to local regulations

12. Manufacturer’s warranty DX tools

Hilti warrants that the tool supplied is free of defects in material and workmanship. This warranty is valid so long as the tool is operated and handled correctly, cleaned and serviced properly and in accordance with the Hilti Operating Instructions, and the technical system is maintained. This means that only original Hilti consumables, components and spare parts, or other products of equivalent quality, may be used in the tool.
This warranty provides the free-of-charge repair or replacement of defective parts only over the entire lifespan of the tool. Parts requiring repair or replacement as a result of normal wear and tear are not covered by this warranty.
Additional claims are excluded, unless stringent nation-

al rules prohibit such exclusion. In particular, Hilti is not obligated for direct, indirect, incidental or consequential damages, losses or expenses in connection with, or by reason of, the use of, or inability to use the tool for any purpose. Implied warranties of merchantability or fitness for a particular purpose are specifically excluded.
For repair or replacement, send tool or related parts immediately upon discovery of the defect to the address of the local Hilti marketing organization provided.
This constitutes Hilti’s entire obligation with regard to warranty and supersedes all prior or contemporaneous comments and oral or written agreements concerning warranties.

13. EC declaration of conformity (original)

Designation: Type: Year of design:

Powder-actuated tool DX 351 2000

We declare, on our sole responsibility, that this product complies with the following directives and standards: 2006/42/EC, 2011/65/EU.

Technical documentation filed at:
Hilti Entwicklungsgesellschaft mbH Zulassung Elektrowerkzeuge Hiltistrasse 6 86916 Kaufering Deutschland

Hilti Corporation, Feldkircherstrasse 100, FL-9494 Schaan

Norbert Wohlwend

Tassilo Deinzer

Head of Quality & Processes Management Head BU Measuring Systems

BU Direct Fastening

BU Measuring Systems

08/2012

30
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14. CIP approval mark

The following applies to C.I.P. member states outside Unacceptable defects or deficiencies, etc. determined

the EU and EFTA judicial area:

during use of the tool must be reported to the person

The Hilti DX 351 has been system and type tested. As a result, the tool bears the square approval mark showing approval number S 809. Hilti thus guarantees compliance with the approved type.

responsible at the approval authority (PTB, Braunschweig)) and to the Office of the Permanent International Commission (C.I.P.) (Permanent Internationial Commission, Avenue de la Renaissance 30, B-1000 Brussels, Belgium).

en

15. Health and safety of the user

Noise information
The following table provides noise measurement information:

Powder-actuated tool Type: Model: Caliber: Power setting: Application:

DX 351 Serial production 6.8/11 red max Fastening 2 mm sheet steel to concrete (C40) using X-U 27/32P8 nail

Declared measured values of noise characteristics according to 2006/42/EC Machinery Directive in conjunction with E DIN EN 15895

Noise (power) level:

LWA, 1s1 107 dB(A)

Emission noise-pressure level in the work station:

LpA, 1s2 101 dB(A)

Peak sound pressure emission level:

LpC,

3
peak

135 dB(C)

Operation and set-up conditions:

Set-up and operation of the pin driver in accordance with E DIN EN 15895-1 in the semi-anechoic test room of

Mul ler-BBM GmbH. The ambient conditions in the test room conform to DIN EN ISO 3745.

Testing procedure: Enveloping surface method in anechoic room on reflective surface area in accordance with E DIN EN 15895, DIN EN ISO 3745 and DIN EN ISO 11201.

NOTE: The noise emissions measured and the associated measurement uncertainty represent the upper limit for the noise values to be expected during the measurements.

Variations in operating conditions may cause deviations from these emission values.

1 ± 2 dB (A) 2 ± 2 dB (A) 3 ± 2 dB (C)

Vibration
The declared total vibration value according to 2006/42/EC does not exceed 2.5 m/s2. Further information regarding the health and safety of the user can be found at the Hilti web site: www.hilti.com/hse

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