GWS 9125 Professional - Broyeur BOSCH - Free user manual and instructions

USER MANUAL GWS 9125 Professional BOSCH

1 609 92A 5WS GWS Professional

www.bosch-pt.com/serviceaddresses

General Power Tool Safety Warnings

WARNING Read all safety warnings and all in-

structions. Failure to follow the

warnings and instructions may result in electric shock, fire

and/or serious injury.

Save all warnings and instructions for future reference.

The term "power tool" in the warnings refers to your mains-

operated (corded) power tool or battery-operated (cord-

Work area safety u Keep work area clean and well lit. Cluttered or dark areas invite accidents. u Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or

dust. Power tools create sparks which may ignite the dust

or fumes. u Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical safety u Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with

earthed (grounded) power tools. Unmodified plugs and

matching outlets will reduce risk of electric shock. u Avoid body contact with earthed or grounded sur- faces, such as pipes, radiators, ranges and refrigerat-

ors. There is an increased risk of electric shock if your

body is earthed or grounded. u Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of elec-

tric shock. u Do not abuse the cord. Never use the cord for carry- ing, pulling or unplugging the power tool. Keep cord

away from heat, oil, sharp edges or moving parts.

Damaged or entangled cords increase the risk of electric

shock. u When operating a power tool outdoors, use an exten- sion cord suitable for outdoor use. Use of a cord suit-

able for outdoor use reduces the risk of electric shock.. u If operating a power tool in a damp location is un- avoidable, use a residual current device (RCD) protec-

ted supply. Use of an RCD reduces the risk of electric

Personal safety u Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a

power tool while you are tired or under the influence

of drugs, alcohol or medication. A moment of inatten-

tion while operating power tools may result in serious per-

sonal injury. u Use personal protective equipment. Always wear eye protection. Protective equipment such as dust mask,

non-skid safety shoes, hard hat, or hearing protection

used for appropriate conditions will reduce personal in-

juries. u Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source

and/or battery pack, picking up or carrying the tool.

Carrying power tools with your finger on the switch or en-

ergising power tools that have the switch on invites acci-

dents. u Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a

rotating part of the power tool may result in personal in-

jury. u Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in

unexpected situations. u Dress properly. Do not wear loose clothing or jew- ellery. Keep your hair, clothing and gloves away from

moving parts. Loose clothes, jewellery or long hair can

be caught in moving parts. u If devices are provided for the connection of dust ex- traction and collection facilities, ensure these are con-

nected and properly used. Use of dust collection can re-

duce dust-related hazards.

Power tool use and care u Do not force the power tool. Use the correct power tool for your application. The correct power tool will do

the job better and safer at the rate for which it was de-

signed. u Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled

with the switch is dangerous and must be repaired. u Disconnect the plug from the power source and/or the battery pack from the power tool before making any

adjustments, changing accessories, or storing power

tools. Such preventive safety measures reduce the risk

of starting the power tool accidentally. u Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or

these instructions to operate the power tool. Power

tools are dangerous in the hands of untrained users. u Maintain power tools. Check for misalignment or bind- ing of moving parts, breakage of parts and any other

condition that may affect the power tool’s operation. Bosch Power Tools 1 609 92A 5WS | (06.08.2020)20 | English

If damaged, have the power tool repaired before use.

Many accidents are caused by poorly maintained power

u Keep cutting tools sharp and clean. Properly main-

tained cutting tools with sharp cutting edges are less

likely to bind and are easier to control.

u Use the power tool, accessories and tool bits etc. in

accordance with these instructions, taking into ac-

count the working conditions and the work to be per-

formed. Use of the power tool for operations different

from those intended could result in a hazardous situation.

u Have your power tool serviced by a qualified repair

person using only identical replacement parts. This

will ensure that the safety of the power tool is maintained.

Safety information for the angle grinder

Safety Warnings common for Grinding, Sanding, Wire

Brushing or Abrasive Cutting Off operations

u This power tool is intended to function as a grinder,

sander, wire brush or cut-off tool. Read all safety

warnings, instructions, illustrations and specifica-

tions provided with this power tool. Failure to follow all

instructions listed below may result in electric shock, fire

and/or serious injury.

u Operations such as polishing are not recommended to

be performed with this power tool. Operations for

which the power tool was not designed may create a haz-

ard and cause personal injury.

u Do not use accessories which are not specifically de-

signed and recommended by the tool manufacturer.

Just because the accessory can be attached to your

power tool, it does not assure safe operation.

u The rated speed of the accessory must be at least

equal to the maximum speed marked on the power

tool. Accessories running faster than their rated speed

can break and fly apart.

u The outside diameter and the thickness of your ac-

cessory must be within the capacity rating of your

power tool. Incorrectly sized accessories cannot be ad-

equately guarded or controlled.

u Threaded mounting of accessories must match the

grinder spindle thread. For accessories mounted by

flanges, the arbour hole of the accessory must fit the

locating diameter of the flange. Accessories that do not

match the mounting hardware of the power tool will run

out of balance, vibrate excessively and may cause loss of

u Do not use a damaged accessory. Before each use in-

spect the accessory such as abrasive wheels for chips

and cracks, backing pad for cracks, tear or excess

wear, wire brush for loose or cracked wires. If power

tool or accessory is dropped, inspect for damage or in-

stall an undamaged accessory. After inspecting and

installing an accessory, position yourself and bystand-

ers away from the plane of the rotating accessory and

run the power tool at maximum no load speed for one

minute. Damaged accessories will normally break apart

during this test time.

u Wear personal protective equipment. Depending on

application, use face shield, safety goggles or safety

glasses. As appropriate, wear dust mask, hearing pro-

tectors, gloves and workshop apron capable of stop-

ping small abrasive or workpiece fragments. The eye

protection must be capable of stopping flying debris gen-

erated by various operations . The dust mask or respir-

ator must be capable of filtrating particles generated by

your operation. Prolonged exposure to high intensity

noise may cause hearing loss.

u Keep bystanders a safe distance away from work area.

Anyone entering the work area must wear personal

protective equipment. Fragments of workpiece or of a

broken accessory may fly away and cause injury beyond

immediate area of operation.

u Hold the power tool by insulated gripping surfaces

only, when performing an operation where the cutting

accessory may contact hidden wiring or its own cord.

Cutting accessory contacting a "live" wire may make ex-

posed metal parts of the power tool "live" and could give

the operator an electric shock.

u Position the cord clear of the spinning accessory. If

you lose control, the cord may be cut or snagged and your

hand or arm may be pulled into the spinning accessory.

u Never lay the power tool down until the accessory has

come to a complete stop. The spinning accessory may

grab the surface and pull the power tool out of your con-

u Do not run the power tool while carrying it at your

side. Accidental contact with the spinning accessory

could snag your clothing, pulling the accessory into your

u Regularly clean the power tool’s air vents. The motor’s

fan will draw the dust inside the housing and excessive

accumulation of powdered metal may cause electrical

u Do not operate the power tool near flammable materi-

als. Sparks could ignite these materials.

u Do not use accessories that require liquid coolants.

Using water or other liquid coolants may result in electro-

Kickback and Related Warnings

Kickback is a sudden reaction to a pinched or snagged rotat-

ing wheel, backing pad, brush or any other accessory. Pinch-

ing or snagging causes rapid stalling of the rotating access-

ory which in turn causes the uncontrolled power tool to be

forced in the direction opposite of the accessory’s rotation

at the point of the binding.

For example, if an abrasive wheel is snagged or pinched by

the workpiece, the edge of the wheel that is entering into the

pinch point can dig into the surface of the material causing

the wheel to climb out or kick out. The wheel may either

jump toward or away from the operator, depending on direc-

tion of the wheel’s movement at the point of pinching. Abras-

1 609 92A 5WS | (06.08.2020) Bosch Power ToolsEnglish | 21

ive wheels may also break under these conditions.

Kickback is the result of power tool misuse and/or incorrect

operating procedures or conditions and can be avoided by

taking proper precautions as given below.

u Maintain a firm grip on the power tool and position

your body and arm to allow you to resist kickback

forces. Always use auxiliary handle, if provided, for

maximum control over kickback or torque reaction

during start-up. The operator can control torque reac-

tions or kickback forces, if proper precautions are taken.

u Never place your hand near the rotating accessory.

Accessory may kickback over your hand.

u Do not position your body in the area where power

tool will move if kickback occurs. Kickback will propel

the tool in direction opposite to the wheel’s movement at

the point of snagging.

u Use special care when working corners, sharp edges

etc. Avoid bouncing and snagging the accessory.

Corners, sharp edges or bouncing have a tendency to

snag the rotating accessory and cause loss of control or

u Do not attach a saw chain woodcarving blade or

toothed saw blade. Such blades create frequent kick-

back and loss of control.

Safety Warnings specific for Grinding and Abrasive

Cutting-Off operations

u Use only wheel types that are recommended for your

power tool and the specific guard designed for the se-

lected wheel. Wheels for which the power tool was not

designed cannot be adequately guarded and are unsafe.

u The grinding surface of centre depressed wheels must

be mounted below the plane of the guard lip. An im-

properly mounted wheel that projects through the plane

of the guard lip cannot be adequately protected.

u The guard must be securely attached to the power tool

and positioned for maximum safety, so the least

amount of wheel is exposed towards the operator.

The guard helps to protect operator from broken wheel

fragments, accidental contact with wheel and sparks that

could ignite clothing.

u Wheels must be used only for recommended applica-

tions. For example: do not grind with the side of cut-

off wheel. Abrasive cut-off wheels are intended for peri-

pheral grinding, side forces applied to these wheels may

cause them to shatter.

u Always use undamaged wheel flanges that are of cor-

rect size and shape for your selected wheel. Proper

wheel flanges support the wheel thus reducing the pos-

sibility of wheel breakage. Flanges for cut-off wheels may

be different from grinding wheel flanges.

u Do not use worn down wheels from larger power

tools. Wheel intended for larger power tool is not suit-

able for the higher speed of a smaller tool and may burst.

Additional Safety Warnings specific for Abrasive Cutting

u Do not “jam” the cut-off wheel or apply excessive

pressure. Do not attempt to make an excessive depth

of cut. Overstressing the wheel increases the loading

and susceptibility to twisting or binding of the wheel in

the cut and the possibility of kickback or wheel breakage.

u Do not position your body in line with and behind the

rotating wheel. When the wheel, at the point of opera-

tion, is moving away from your body, the possible kick-

back may propel the spinning wheel and the power tool

u When wheel is binding or when interrupting a cut for

any reason, switch off the power tool and hold the

power tool motionless until the wheel comes to a com-

plete stop. Never attempt to remove the cut-off wheel

from the cut while the wheel is in motion otherwise

kickback may occur. Investigate and take corrective ac-

tion to eliminate the cause of wheel binding.

u Do not restart the cutting operation in the workpiece.

Let the wheel reach full speed and carefully re-enter

the cut. The wheel may bind, walk up or kickback if the

power tool is restarted in the workpiece.

u Support panels or any oversized workpiece to minim-

ize the risk of wheel pinching and kickback. Large

workpieces tend to sag under their own weight. Supports

must be placed under the workpiece near the line of cut

and near the edge of the workpiece on both sides of the

u Use extra caution when making a “pocket cut” into ex-

isting walls or other blind areas. The protruding wheel

may cut gas or water pipes, electrical wiring or objects

that can cause kickback.

Safety Warnings specific for Sanding operations

u Do not use excessively oversized sanding disc paper.

Follow manufacturers recommendations, when select-

ing sanding paper. Larger sanding paper extending bey-

ond the sanding pad presents a laceration hazard and

may cause snagging, tearing of the disc, or kickback.

Safety Warnings specific for Wire Brushing operations

u Be aware that wire bristles are thrown by the brush

even during ordinary operation. Do not overstress the

wires by applying excessive load to the brush The wire

bristles can easily penetrate light clothing and/or skin.

u If the use of a guard is recommended for wire brush-

ing, do not allow any interference of the wire wheel or

brush with the guard. Wire wheel or brush may expand

in diameter due to work load and centrifugal forces.

Additional safety information

Wear safety goggles.

u Use suitable detectors to determine if utility lines are

hidden in the work area or call the local utility com-

Bosch Power Tools 1 609 92A 5WS | (06.08.2020)22 | English

pany for assistance. Contact with electric lines can lead

to fire and electric shock. Damaging a gas line can lead to

explosion. Penetrating a water line causes property dam-

age or may cause an electric shock. u Do not touch grinding and cutting discs until they have cooled down. The discs can become very hot while work-

ing. u Release the On/Off switch and set it to the off position when the power supply is interrupted, e. g., in case of

a power failure or when the mains plug is pulled. This

prevents uncontrolled restarting. u Secure the workpiece. A workpiece clamped with clamping devices or in a vice is held more secure than by

Products sold in GB only:

Your product is fitted with an BS 1363/A approved electric

plug with internal fuse (ASTA approved to BS 1362).

If the plug is not suitable for your socket outlets, it should be

cut off and an appropriate plug fitted in its place by an au-

thorised customer service agent. The replacement plug

should have the same fuse rating as the original plug.

The severed plug must be disposed of to avoid a possible

shock hazard and should never be inserted into a mains

Product Description and

Read all the safety and general instructions.

Failure to observe the safety and general in-

structions may result in electric shock, fire

and/or serious injury.

Please observe the illustrations at the beginning of this oper-

The power tool is intended for cutting, roughing and brush-

ing metal and stone materials, as well as making holes in

stone materials using diamond core cutters, without the use

A special protective guard for cutting must be used when

cutting bonded abrasives.

Sufficient dust extraction must be provided when cutting

With approved abrasive tools, the power tool can be used for

sanding with sanding discs.

The power tool must not be used to grind concrete.

The numbering of the product features refers to the diagram

of the power tool on the graphics page.

Unlocking lever for protective guard

Speed preselection thumbwheel

Auxiliary handle (insulated gripping surface)

Protective guard for cutting

Protective guard for grinding

Extraction guard for grinding

Mounting flange with O‑ring

Two-pin spanner for clamping nut

Handle (insulated gripping surface)

Extraction guard for cutting with cutting guides

Diamond cutting disc

Diamond annular cutter

Accessories shown or described are not included with the

product as standard. You can find the complete selection of

accessories in our accessories range.

Speed adjustment range min

Max. thread length of

mm 22.2 22.2 22.2 22.2 22.2

Speed preselection – – – – –

Constant electronic control – – – ● ●

Restart protection ● ● ● ● ●

Starting current limitation ● ● ● ● ●

Kickback stop – – – ● ●

Weight according to EPTA-Procedure 01:2014

– With low-vibration auxil-

kg 2.1 2.1 2.3 2.3 2.3

– With standard auxiliary

kg 2.0 2.0 2.2 2.2 2.2

/ II / II / II / II / II The specifications apply to a rated voltage [U] of 230 V. These specifications may vary at different voltages and in country-

Speed adjustment range min

– 2800–11,500 2800–11,500 2200–7500

Grinding spindle thread M 14 M 14 M 14 M 14

Max. thread length of grinding spindle mm 22.2 22.2 22.2 22.2

Speed preselection – ● ● ●

Constant electronic control ● ● ● ●

Restart protection ● ● ● ●

Starting current limitation ● ● ● ●

Kickback stop ● ● ● ●

Weight according to EPTA-Procedure 01:2014

– With low-vibration auxiliary handle kg 2.3 2.3 2.4 2.4

– With standard auxiliary handle kg 2.2 2.2 2.3 2.3

/ II / II / II / II The specifications apply to a rated voltage [U] of 230 V. These specifications may vary at different voltages and in country-specific models.

Speed adjustment range min

– 2800–11,500 2800–9300 – 2200–7500

Max. grinding disc diameter mm 125 125 125 150 125

Grinding spindle thread M 14 M 14 M 14 M 14 M 14

Bosch Power Tools 1 609 92A 5WS | (06.08.2020)24 | English

Angle grinder GWS 17-125CI 17-125CIE 17-125CIT 17-150CI 17-125Inox

Max. thread length of grinding

mm 22.2 22.2 22.2 22.2 22.2

Speed preselection – ● ● – ●

Constant electronic control ● ● ● ● ●

Restart protection ● ● ● ● ●

Starting current limitation ● ● ● ● ●

Kickback stop ● ● ● ● ●

Weight according to EPTA-Procedure 01:2014

– With low-vibration auxiliary

kg 2.4 2.4 2.4 2.5 2.4

– With standard auxiliary

kg 2.3 2.3 2.3 2.4 2.3

/ II / II / II / II / II The specifications apply to a rated voltage [U] of 230 V. These specifications may vary at different voltages and in country-specific models.

Speed adjustment range min

Grinding spindle thread M 14 M 14 M 14 M 14

Max. thread length of grinding spindle mm 22.2 22.2 22.2 22.2

Speed preselection – ● – –

Constant electronic control ● ● ● ●

Restart protection ● ● ● ●

Starting current limitation ● ● ● ●

Kickback stop ● ● ● ●

Weight according to EPTA-Procedure 01:2014

– With low-vibration auxiliary handle kg 2.4 2.4 2.5 2.4

– With standard auxiliary handle kg 2.3 2.3 2.4 2.3

/ II / II / II / II The specifications apply to a rated voltage [U] of 230 V. These specifications may vary at different voltages and in country-specific models.

Noise emission values determined according toEN60745-2-3.

Typically, the A-weighted noise level of the power tool is

Sound pressure level

(triax vector sum) and uncertainty K determined according toEN60745-2-3:

Grinding surfaces (roughing):

Noise emission values determined according toEN60745-2-3.

Typically, the A-weighted noise level of the power tool is

Sound pressure level

(triax vector sum) and uncertainty K determined according toEN60745-2-3:

Grinding surfaces (roughing):

Noise emission values determined according toEN60745-2-3.

Typically, the A-weighted noise level of the power tool is

Sound pressure level

(triax vector sum) and uncertainty K determined according toEN60745-2-3:

Grinding surfaces (roughing):

Bosch Power Tools 1 609 92A 5WS | (06.08.2020)26 | English

GWS 19-125CI 19-125CIE 19-150CI 19-125CIST Typically, the A-weighted noise level of the power tool is

Sound pressure level

(triax vector sum) and uncertainty K determined according toEN60745-2-3:

Grinding surfaces (roughing):

The vibration level given in these instructions has been

measured in accordance with a standardised measuring pro-

cedure and may be used to compare power tools. It can also

be used for a preliminary estimation of exposure to vibra-

The stated vibration level applies to the main applications of

the power tool. However, if the power tool is used for differ-

ent applications, with different application tools or poorly

maintained, the vibration level may differ. This can signific-

antly increase the exposure to vibration over the total work-

To estimate the exposure to vibration accurately, the times

when the tool is switched off or when it is running but not ac-

tually being used should also be taken into account. This can

significantly reduce the exposure to vibration over the total

Implement additional safety measures to protect the oper-

ator from the effects of vibration, such as servicing the

power tool and application tools, keeping the hands warm,

and organising workflows correctly.

Fitting protective equipment u Pull the plug out of the socket before carrying out any work on the power tool.

Note: If the grinding disc breaks during operation or the

holding fixtures on the protective guard/power tool become

damaged, the power tool must be sent to the after-sales ser-

vice immediately; see the "After-Sales Service and Applica-

tion Service" section for addresses.

Protective guard for grinding

Place the protective guard

(7) onto the holder on the

power tool until the coding

cams of the protective

guard are aligned with the

holder. When doing so,

press and hold the unlock-

Press the protective guard

(7) onto the spindle collar

until the shoulder of the

protective guard is sitting

on the flange of the power

tool and rotate the protect-

ive guard until it audibly

Adjust the position of the protective guard (7) to meet the

requirements of the operation. To do this, push the unlock-

ing lever (1) upward and rotate the protective guard (7) into

the required position.

u Always position the protective guard (7) such that all

three red cams on the unlocking lever (1) engage in

the corresponding openings on the protective guard

u Adjust the protective guard (7) such that sparking in

the direction of the operator is prevented.

u The protective guard (7) must only be adjustable

while the unlocking lever (1) is actuated. Otherwise,

the power tool must not be used any more under any

circumstances and must be sent to the after-sales ser-

Note: The coding cams on the protective guard (7) ensure

that only a protective guard that is suitable for the power

Extraction guard for sanding

The extraction guard (8) can be used to minimise dust when

sanding paint, varnish and plastics in conjunction with the

1 609 92A 5WS | (06.08.2020) Bosch Power ToolsEnglish | 27

carbide grinding head (10). The extraction guard (8) is not

suitable for working metals.

A suitable Bosch vacuum cleaner can be connected to the

extraction guard (8).

The extraction guard (8) is mounted in the same manner as

the protective guard (7). The brush collar can be replaced.

Protective guard for cutting

u Always use the protective guard for cutting (6) when

cutting bonded abrasives.

u Provide sufficient dust extraction when cutting stone.

The protective guard for cutting (6) is fitted in the same way

as the protective guard for grinding (7).

Extraction guard for cutting with a guide block

The extraction guard for cutting with a guide block (18) is fit-

ted in the same way as the protective guard for grinding.

u Always fit the hand guard (20) when working with the

rubber sanding plate (22) or with the cup brush/disc

Attach the hand guard (20) to the side handle (5).

u Do not operate your power tool without the side

u Do not continue to use the power tool if the auxiliary

handle is damaged. Do not make any alterations to the

Screw the side handle (5) on the left or right of the machine

head depending on how your are working.

Low-vibration auxiliary handle

Screw the auxiliary handle

(5) on the right or left of the

machine head depending

on the working method.

The low-vibration auxiliary handle reduces vibration, en-

abling the tool to be used safely and more comfortably.

u Do not operate your power tool without the side

u Do not make any alterations of any kind to the auxili-

Do not continue to use a damaged auxiliary handle.

Fitting the abrasive tools

u Pull the plug out of the socket before carrying out any

work on the power tool.

u Do not touch grinding and cutting discs until they have

cooled down. The discs can become very hot while work-

Clean the grinding spindle (16) and all the parts to be fitted.

Lock the grinding spindle with the spindle lock button (2)

before clamping and releasing the abrasive tools.

u Do not press the spindle lock button while the grind-

ing spindle is moving. The power tool may become dam-

aged if you do this.

Grinding/cutting disc

Pay attention to the dimensions of the abrasive tools. The

diameter of the hole must match that of the mounting flange.

Do not use an adapter or reducer.

When using diamond cutting discs, ensure that the arrow in-

dicating the direction of rotation on the diamond cutting disc

matches the direction of rotation of the power tool (see the

direction of rotation arrow on the machine head).

See the graphics page for assembly instructions.

To fasten the grinding/cutting disc, screw on the clamping

nut(14) and tighten with the two-hole spanner(see " Quick-

clamping nut ", page27).

u After fitting the abrasive tool, check that the abrasive

tool is fitted correctly and can turn freely before

switching on the power tool. Make sure that the abras-

ive tool does not brush against the protective guard or

A plastic part (O-ring) is fitted around the cent-

ring collar in the mounting flange (9). If the O-

ring is missing or damaged, the mounting

flange (9) must be replaced before operation

u Always fit the hand guard (20) when working with the

u Always fit the hand guard (20) when working with the

rubber sanding pad (22).

See the graphics page for fitting instructions.

Screw on the round nut (24) and tighten with the two-pin

Cup brush/disc brush

u Always fit the hand guard (20) when working with the

cup brush or disc brush.

See the graphics page for fitting instructions.

The cup brush/disc brush must be screwed onto the grinding

spindle until it rests firmly against the grinding spindle flange

at the end of the grinding spindle thread. Tighten the cup

brush/disc brush with an open-ended spanner.

To change the abrasive tool easily without having to use any

additional tools, you can use the quick-clamping nut (13) in-

stead of the clamping nut (14).

u The quick-clamping nut (13) may be used only for

grinding or cutting discs.

Only use quick-clamping nuts (13) that are in good work-

ing order and not damaged.

When screwing on, make sure that the printed side of the

quick-clamping nut (13) is not facing the grinding disc;

the arrow must be pointing towards the index mark (26).

Bosch Power Tools 1 609 92A 5WS | (06.08.2020)28 | English

Press the spindle lock but-

ton (2) to lock the grinding

spindle. To tighten the

quick-clamping nut, turn

the grinding disc firmly

If the quick-clamping nut

has been attached correctly

and is not damaged, you

can loosen it by hand by

turning the knurled ring an-

ticlockwise. If the quick-

clamping nut is stuck, do

not attempt to loosen it

with pliers – always use

the two-pin spanner. Posi-

tion the two‑pin spanner as

shown in the figure.

Approved abrasive tools

You can use all the abrasive tools mentioned in these operat-

The permissible speed [min

] or the circumferential speed

[m/s] of the abrasive tools used must at least match the val-

ues given in the table.

It is therefore important to observe the permissible rota-

tional/circumferential speed on the label of the abrasive

Rotating the machine head (seefigureA)

u Pull the plug out of the socket before carrying out any

work on the power tool.

The machine head can be rotated in 90° increments. In this

way, the on/off switch can be brought into a more favourable

handling position for particular applications, e.g. for left-

Completely unscrew the four screws. Rotate the machine

head carefully, without removing it from the housing, into

the new position. Screw in and retighten the four screws.

Dust/Chip Extraction

The dust from materials such as lead paint, some types of

wood, minerals and metal can be harmful to human health.

Touching or breathing in this dust can trigger allergic reac-

tions and/or cause respiratory illnesses in the user or in

people in the near vicinity.

Certain dusts, such as oak or beech dust, are classified as

carcinogenic, especially in conjunction with wood treatment

additives (chromate, wood preservative). Materials contain-

ing asbestos may only be machined by specialists.

– Use a dust extraction system that is suitable for the ma-

terial wherever possible.

– Provide good ventilation at the workplace.

– It is advisable to wear a P2 filter class breathing mask.

The regulations on the material being machined that apply in

the country of use must be observed.

u Avoid dust accumulation at the workplace. Dust can

u Pay attention to the mains voltage. The voltage of the

power source must match the voltage specified on the

rating plate of the power tool. Power tools marked

with 230V can also be operated with 220V.

When operating the power tool using a mobile generator that

does not have sufficient reserve capacity or an adequate

voltage control system with inrush current boost converter,

loss of performance or atypical behaviour may occur upon

Please check the suitability of the power generator you are

using, particularly with regard to the mains voltage and fre-

u Products that are only sold in AUS and NZ: Use a resid-

ual current device (RCD) with a nominal residual current

To start the power tool, push the on/off switch (3) forward.

To lock the on/off switch (3) in position, push the on/off

switch (3) forward and down until it clicks into place.

To switch off the power tool, release the on/off switch (3);

or, if the switch is locked, briefly push the on/off switch (3)

backward and down and then release it.

1 609 92A 5WS | (06.08.2020) Bosch Power ToolsEnglish | 29

u Always check abrasive tools before using them. The

abrasive tool must be fitted properly and be able to

move freely. Carry out a test run for at least one

minute with no load. Do not use abrasive tools that are

damaged, run untrue or vibrate during use. Damaged

abrasive tools can burst apart and cause injuries.

The restart protection feature prevents the power tool from

uncontrolled starting after the power supply to it has been

To restart the tool, set the on/off switch (3) to the off posi-

tion and then switch the power tool on again.

Starting current limitation

The electronic starting current limitation feature restricts the

power of the power tool when it is switched on and enables

operation using a 16 A fuse.

Note: If the power tool runs at full speed immediately after

being switched on, this means that the starting current limit-

ation and restarting protection mechanisms have failed. The

power tool must be sent to the after-sales service immedi-

ately; see the "After-Sales Service and Application Service"

section for addresses.

GWS 19-150 CI / GWS 19-125 CIST)

If there is a sudden kickback in the power tool,

e.g. jamming in a separating cut, the power

supply to the motor will be interrupted elec-

To restart the tool, set the On/Off switch (3) to the "off" po-

sition and then switch the power tool on again.

Constant Electronic control

(GWS 12-125 CI / GWS 13-125 CI / GWS 13-125 CIE /

GWS 19-150 CI / GWS 19-125 CIST)

The Constant Electronic keeps the speed at no load and un-

der load virtually consistent, guaranteeing uniform perform-

You can preselect the required speed using the speed

preselection thumbwheel (4), even during operation. The in-

formation in the table below describes the recommended

Material Application Application tool Thumbwheel position

Wood, metal Brushing, removing rust Cup brush, abrasive disc 3

Metal Rough grinding Grinding disc 6

Metal Cutting Cutting disc 6

Stone Cutting Diamond cutting disc and cutting

guide (cutting of stone is permit-

ted only with a cutting guide)

The values specified for speed levels are guide values.

u The rated speed of the accessory must be at least

equal to the maximum speed marked on the power

tool. Accessories running faster than their rated speed

can break and fly apart.

u Pull the plug out of the socket before carrying out any

work on the power tool.

u Exercise caution when cutting slots in structural walls;

see the "Information on structural design" section.

u Clamp the workpiece if it is not secure under its own

u Do not load the power tool so heavily that it comes to a

u If the power tool has been subjected to a heavy load,

continue to run it at no-load for several minutes to

cool down the accessory.

u Do not use the power tool with a cut-off stand.

u Do not touch grinding and cutting discs until they have

cooled down. The discs can become very hot while work-

With the flap disc (accessory), curved surfaces and profiles

can be worked. Flap discs have a considerably higher ser-

Bosch Power Tools 1 609 92A 5WS | (06.08.2020)30 | English

vice life, lower noise levels and lower sanding temperatures

than conventional sanding sheets.

u Never use cutting discs for rough grinding.

The best rough grinding results are achieved with a set angle

of 30° to 40°. Move the power tool back and forth with mod-

erate pressure. This will ensure that the workpiece does not

become too hot or discolour and that grooves are not

u Always use the protective guard for cutting (6) when

cutting bonded abrasives.

When carrying out abrasive cutting, use a moderate feed

that is suited to the material being machined. Do not exert

pressure on the cutting disc and do not tilt or swing the

Do not attempt to reduce the speed of a cutting disc coming

to a stop by applying pressure from the side.

The power tool must always

work in an up-grinding mo-

tion. Otherwise, there is a

risk that it will be pushed

uncontrolled out of the cut.

For best results when cut-

ting profiles and rectangular

tubing, start at the smallest

u Provide sufficient dust extraction when cutting stone.

u The power tool may be used only for dry cutting/grind-

For best results when cutting stone, use a diamond cutting

When using the extraction guard for cutting with a guide

block (18), the vacuum cleaner must be approved for vacu-

uming stone dust. Suitable vacuum cleaners are available

Switch on the power tool

and position it with the

front part of the guide block

on the workpiece. Move the

power tool with a moderate

feed motion that is suited to

the material being ma-

When cutting especially

hard materials such as con-

crete with a high pebble content, the diamond cutting disc

can overheat and become damaged as a result. This is

clearly indicated by circular sparking, rotating with the dia-

If this happens, stop cutting and allow the diamond cutting

disc to cool down by running the power tool for a short time

at maximum speed with no load.

Working noticeably slower and with circular sparking indic-

ate that the diamond cutting disc that has become dull. You

can resharpen the disc by briefly cutting into abrasive mater-

ial (e.g. lime-sand brick).

Information on structural design

Slots in load-bearing walls are subject to DIN 1053 part 1 or

country-specific regulations. These regulations must be ob-

served under all circumstances. Seek advice from the re-

sponsible structural engineer, architect or construction su-

pervisor before starting work.

Maintenance and Service

Maintenance and cleaning

u Pull the plug out of the socket before carrying out any

work on the power tool.

u To ensure safe and efficient operation, always keep

the power tool and the ventilation slots clean.

u In extreme conditions, always use a dust extractor if

possible. Blow out ventilation slots frequently and in-

stall a residual current device (RCD) upstream. When

machining metals, conductive dust can settle inside the

power tool, which can affect its protective insulation.

Store and handle the accessories carefully.

In order to avoid safety hazards, if the power supply cord

needs to be replaced, this must be done by Bosch or by an

after-sales service centre that is authorised to repair Bosch

After-Sales Service and Application Service

Our after-sales service responds to your questions concern-

ing maintenance and repair of your product as well as spare

parts. You can find explosion drawings and information on

spare parts at: www.bosch-pt.com

The Bosch product use advice team will be happy to help you

with any questions about our products and their accessor-

In all correspondence and spare parts orders, please always

include the 10‑digit article number given on the nameplate

Robert Bosch Ltd. (B.S.C.)

UB 9 5HJ At www.bosch-pt.co.uk you can order spare parts or arrange

the collection of a product in need of servicing or repair.

Tel. Service: (0344) 7360109

E-Mail: boschservicecentre@bosch.com

1 609 92A 5WS | (06.08.2020) Bosch Power ToolsFrançais | 31

You can find further service addresses at:

www.bosch-pt.com/serviceaddresses

The power tool, accessories and packaging should be re-

cycled in an environmentally friendly manner.

Do not dispose of power tools along with

Only for EU countries:

According to the European Directive 2012/19/EU on Waste

Electrical and Electronic Equipment and its implementation

into national law, power tools that are no longer usable must

be collected separately and disposed of in an environment-

ally friendly manner.

M 14 M 14 M 14 M 14 M 14

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Protection anti-redémarrage ● ● ● ● ●

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

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Constant Electronic – – – ● ●

Constant Electronic ● ● ● ●

Constant Electronic ● ● ● ● ●

Constant Electronic ● ● ● ●

www.bosch-pt.com/serviceaddresses

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www.bosch-pt.com/serviceaddresses

Constant Electronic – – – ● ●

Constant Electronic ● ● ● ●

Constant Electronic ● ● ● ● ●

Constant Electronic ● ● ● ●

www.bosch-pt.com/serviceaddresses

Bosch Service Center

www.bosch-pt.com/serviceaddresses

Bosch Service Center

www.bosch-pt.com/serviceaddresses

Turtallsinnstilling – ● ● ●

Turtallsinnstilling – ● ● – ●

Overflatesliping (grovsliping):

Overflatesliping (grovsliping):

Overflatesliping (grovsliping):

Overflatesliping (grovsliping):

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

System Constant Electronic ● ● ● ●

System Constant Electronic ● ● ● ● ●

System Constant Electronic ● ● ● ●

Robert Bosch Sp. z o.o.

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

M 14 M 14 M 14 M 14 M 14

M 14 M 14 M 14 M 14 M 14

www.bosch-pt.com/serviceaddresses

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www.bosch-pt.com/serviceaddresses

Sistem electronic constant – – – ● ●

Sistem electronic constant ● ● ● ●

Sistem electronic constant ● ● ● ● ●

Sistem electronic constant ● ● ● ●

Sistem electronic constant

www.bosch-pt.com/serviceaddresses

Robert Bosch SRL Service scule electrice

www.bosch-pt.com/bg/bg/

Други сервизни адреси ще откриете на:

www.bosch-pt.com/serviceaddresses

M 14 M 14 M 14 M 14 M 14

M 14 M 14 M 14 M 14 M 14

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses

M 14 M 14 M 14 M 14 M 14

M 14 M 14 M 14 M 14 M 14

(GWS 12-125 CI / GWS 13-125 CI / GWS

13-125 CIE / GWS 15-125 CIE / GWS 15-125

Inox / GWS 17-125 CI / GWS17-125 CIE /

GWS 17-125 CIT / GWS 17-150 CI / GWS

(GWS 12-125 CI / GWS 13-125 CI / GWS

13-125 CIE / GWS 15-125 CIE / GWS 15-125

Inox / GWS 17-125 CI / GWS17-125 CIE /

GWS 17-125 CIT / GWS 17-150 CI / GWS

(GWS 13-125 CIE / GWS 15-125 CIE / GWS

www.bosch-pt.com/serviceaddresses

1150011500115001150011500

–2800–115002800–115002200–7500

–2800–115002800–9300–2200–7500

1150011500115001150011500

–2800–115002800–115002200–7500

–2800–115002800–9300–2200–7500

EU Declaration of Conformity

We declare under our sole responsibility that the stated products comply

with all applicable provisions of the directives and regulations listed below

and are in conformity with the following standards.

Technical file at: *

GWS 17-125 CI GWS 17-125 CIE GWS 17-125 CIT GWS 17-150 CI GWS 17-125 Inox

Chairman of Executive

Head of Product Certification