amount of wheel is exposed towards the operator

18 | English 
1 609 92A 0MJ | (23.4.14)
Bosch Power Tools
Safety warnings specific for wire brushing operations
 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.
 If the use of a guard is recommended for wire brushing, 
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 warnings
Wear safety goggles.
 Use suitable detectors to determine if utility lines are 
hidden in the work area or call the local utility company 
for assistance. Contact with electric lines can lead to fire 
and electric shock. Damaging a gas line can lead to explo-
sion. Penetrating a water line causes property damage or 
may cause an electric shock.
 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 pre-
vents uncontrolled restarting.
 Do not touch grinding and cutting discs before they 
have cooled down. The discs can become very hot while 
working.
 Secure the workpiece. A workpiece clamped with clamp-
ing devices or in a vice is held more secure than by hand.
Products sold in GB only: Your product is fitted with a 
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 author-
ised 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 sock-
et elsewhere.
Products sold in AUS and NZ only: Use a residual current de-
vice (RCD) with a rated residual current of 30 mA or less.
Product Description and Specifica-
tions
Read all safety warnings and all instruc-
tions. Failure to follow the warnings and in-
structions may result in electric shock, fire 
and/or serious injury.
While reading the operating instructions, unfold the graphics 
page for the machine and leave it open.
Intended Use
The machine is intended for cutting, roughing and brushing of 
metal and stone materials without the use of water.
For cutting with bonded abrasives, a special cutting guard 
(accessory) must be used.
When cutting in stone, provide for sufficient dust extraction.
With approved sanding tools, the machine can be used for 
sanding with sanding discs.
Product Features
The numbering of the product features refers to the illustra-
tion of the machine on the graphics page.
1 Spindle lock button
2 On/Off switch
3 Auxiliary handle (insulated gripping surface)
4 Grinder spindle
5 Protection guard for grinding
6 Locking screw for protection guard
7 Mounting flange with O-ring
8 Grinding wheel*
9 Clamping nut
10 Two-pin spanner for clamping nut*
11 Quick-clamping nut 
*
12 Carbide grinding head*
13 Protection guard for cutting*
14 Cutting disc*
15 Protection guard for grinding cup*
16 Grinding cup*
17 Two-pin spanner, offset, for grinding cup*
18 Hand guard*
19 Spacer discs*
20 Rubber sanding plate*
21 Sanding sheet*
22 Round nut*
23 Cup brush*
24 Cutting guide with dust extraction protection guard *
25 Diamond cutting disc*
26 Handle (insulated gripping surface)
*Accessories shown or described are not part of the standard de-
livery scope of the product. A complete overview of accessories 
can be found in our accessories program.
Technical Data
Angle Grinder
GWS ...
20-230
H
20-230
JH
Article number
3 601 ...
... H50 L.. ... H50 M..
Rated power input
W
2000
2000
Output power
W
1250
1250
The values given are valid for a nominal voltage [U] of 230 V. For differ-
ent voltages and models for specific countries, these values can vary.
Only for power tools without reduced starting current: Starting cycles 
generate brief voltage drops. Interference with other equipment/ma-
chines may occur in case of unfavourable mains system conditions. Mal-
functions are not to be expected for system impedances below 
0.25 ohm.
OBJ_BUCH-1686-003.book  Page 18  Wednesday, April 23, 2014  3:36 PM

 English | 19
Bosch Power Tools
1 609 92A 0MJ | (23.4.14)
Noise/Vibration Information
Measured sound values determined according to EN 60745.
Typically the A-weighted noise levels of the product are: 
Sound pressure level 92 dB(A); Sound power level 
103 dB(A). Uncertainty K =3 dB.
Wear hearing protection!
Vibration total values a
h
 (triax vector sum) and uncertainty K 
determined according to EN 60745:
Surface grinding: a
h
=7.5 m/s
2
, K=1.5 m/s
2
,
Disk sanding: a
h
=4.0 m/s
2
, K=1.5 m/s
2
.
The vibration level given in this information sheet has been 
measured in accordance with a standardised test given in 
EN 60745 and may be used to compare one tool with anoth-
er. It may be used for a preliminary assessment of exposure.
The declared vibration emission level represents the main ap-
plications of the tool. However if the tool is used for different 
applications, with different accessories or insertion tools or is 
poorly maintained, the vibration emission may differ. This 
may significantly increase the exposure level over the total 
working period.
An estimation of the level of exposure to vibration should also 
take into account the times when the tool is switched off or 
when it is running but not actually doing the job. This may sig-
nificantly reduce the exposure level over the total working 
period.
Identify additional safety measures to protect the operator 
from the effects of vibration such as: maintain the tool and the 
accessories, keep the hands warm, organisation of work pat-
terns.
Declaration of Conformity
We declare under our sole responsibility that the product de-
scribed under “Technical Data” is in conformity with the fol-
lowing standards or standardization documents: EN 60745 
according to the provisions of the directives 2011/65/EU, 
2004/108/EC, 2006/42/EC.
Technical file (2006/42/EC) at:
Robert Bosch GmbH, PT/ETM9
D-70745 Leinfelden-Echterdingen
Robert Bosch GmbH, Power Tools Division
D-70745 Leinfelden-Echterdingen
31.03.2014
Assembly
Mounting the Protective Devices
 Before any work on the machine itself, pull the mains 
plug.
Note: After breakage of the grinding disc during operation or 
damage to the holding fixtures on the protection guard/power 
tool, the machine must promptly be sent to an after-sales ser-
vice agent for maintenance. For addresses, see section “Af-
ter-sales Service and Application Service”.
Protection Guard for Grinding
Place the protection guard 5 on the spindle collar. Adjust the 
position of the protection guard 5 to the requirements of the 
operation and lock the protection guard 5 with the locking 
screw 6.
 Adjust the protection guard 5 in such a manner that 
sparking is prevented in the direction of the operator.
Protection Guard for Cutting
 For cutting with bonded abrasives, always use the pro-
tection guard for cutting 13.
 Provide for sufficient dust extraction when cutting 
stone.
The protection guard for cutting 13 is mounted in the same 
manner as the protection guard for grinding 5.
Cutting Guide with Dust Extraction Protection Guard
The cutting guide with dust extraction protection guard 24 is 
mounted in the same manner as the protection guard for 
grinding 5.
Auxiliary Handle
 Operate your machine only with the auxiliary handle 3.
Screw the auxiliary handle 3 on the right or left of the machine 
head depending on the working method.
Rated speed
min
-1
6600
6600
Grinding disc diameter, max.
mm
230
230
Thread of grinder spindle
M 14
M 14
Thread length (max.) of grind-
er spindle
mm
25
25
Restarting Protection
–

Reduced starting current
–

Weight according to 
EPTA-Procedure 01/2003
– with vibration-damping 
auxiliary handle
– with standard-auxiliary 
handle
kg
kg
5.2
5.1
5.2
5.1
Protection class
/
II
/
II
Angle Grinder
GWS ...
20-230
H
20-230
JH
The values given are valid for a nominal voltage [U] of 230 V. For differ-
ent voltages and models for specific countries, these values can vary.
Only for power tools without reduced starting current: Starting cycles 
generate brief voltage drops. Interference with other equipment/ma-
chines may occur in case of unfavourable mains system conditions. Mal-
functions are not to be expected for system impedances below 
0.25 ohm.
Henk Becker
Executive Vice President
Engineering
Helmut Heinzelmann
Head of Product Certification
PT/ETM9
OBJ_BUCH-1686-003.book  Page 19  Wednesday, April 23, 2014  3:36 PM

20 | English 
1 609 92A 0MJ | (23.4.14)
Bosch Power Tools
Hand Guard
 For operations with the rubber sanding plate 20 or with 
the cup brush/wheel brush/flap disc, always mount the 
hand guard 18.
The hand guard 18 is fastened with the auxiliary handle 3.
Mounting the Grinding Tools
 Before any work on the machine itself, pull the mains 
plug.
 Do not touch grinding and cutting discs before they 
have cooled down. The discs can become very hot while 
working.
Clean the grinder spindle 4 and all parts to be mounted.
For clamping and loosening the grinding tools, lock the grind-
er spindle with the spindle lock button 1.
 Actuate the spindle lock button only when the grinder 
spindle is at a standstill. Otherwise, the machine may be-
come damaged.
Grinding/Cutting Disc
Pay attention to the dimensions of the grinding tools. The 
mounting hole diameter must fit the mounting flange without 
play. Do not use reducers or adapters.
When using diamond cutting discs, pay attention that the di-
rection-of-rotation arrow on the diamond cutting disc and the 
direction of rotation of the machine (see direction-of-rotation 
arrow on the machine head) agree.
See graphics page for the mounting sequence.
To fasten the grinding/cutting disc, screw on the clamping nut 
9 and tighten with the two-pin spanner; see Section “Quick-
clamping Nut ”.
 After mounting the grinding tool and before switching 
on, check that the grinding tool is correctly mounted 
and that it can turn freely. Make sure that the grinding 
tool does not graze against the protection guard or oth-
er parts.
A plastic part (O-ring) is fitted around 
the centring collar of mounting flange 7. 
If the O-ring is missing or damaged, 
the mounting flange 7 must be replaced 
before resuming operation.
Flap Disc
 For operations with the flap disc, always mount the 
hand guard 18.
Rubber Sanding Plate
 For operations with the rubber sanding plate 20, al-
ways mount the hand guard 18.
See graphics page for the mounting sequence.
Before mounting the rubber sanding plate 20, put the 2 spac-
er discs 19 onto the grinder spindle 4.
Screw on the round nut 22 and tighten with the two-pin span-
ner.
Cup Brush/Disc Brush
 For operations with the cup brush/wheel brush, always 
mount the hand guard 18.
See graphics page for the mounting sequence.
The cup brush/disc brush must be able to be screwed onto 
the grinder spindle until it rests firmly against the grinder 
spindle flange at the end of the grinder spindle threads. Tight-
en the cup brush/disc brush with an open-end spanner.
Grinding Cup
 When working with the grinding cup, mount the special 
protection guard 15.
The grinding cup 16 should never project further out of the 
protection guard 15 than necessary for the respective grind-
ing application. Adjust the protection guard 15 accordingly to 
this dimension.
See graphics page for the mounting sequence.
Screw on clamping nut 9 and tighten with two-pin spanner 
17.
Quick-clamping Nut
For convenient changing of grinding tools without the use of 
additional tools, you can use the quick-clamping nut 11 in-
stead of the clamping nut 9.
 The quick-clamping nut 11 may be used only for grind-
ing or cutting discs.
Use only a flawless, undamaged quick-clamping nut 11.
When screwing on, pay attention that the side of the 
quick-clamping nut 11 with printing does not face the 
grinding disc; the arrow must point to the index mark 27.
Lock the grinder spindle with 
the spindle lock button 1. To 
tighten the quick-clamping 
nut, firmly turn the grinding 
disc in clockwise direction.
A properly attached, undam-
aged quick-clamping nut can 
be loosened by hand when 
turning the knurled ring in an-
ticlockwise direction.
Never loosen a tight quick-
clamping nut with pliers. Al-
ways use the two-pin span-
ner. Insert the two-pin span-
ner as shown in the 
illustration.
27
OBJ_BUCH-1686-003.book  Page 20  Wednesday, April 23, 2014  3:36 PM

 English | 21
Bosch Power Tools
1 609 92A 0MJ | (23.4.14)
Approved Grinding Tools
All grinding tools mentioned in these operating instructions 
can be used.
The permissible speed [min
-1
] or the circumferential speed 
[m/s] of the grinding tools used must at least match the values 
given in the table.
Therefore, observe the permissible rotational/circumferen-
tial speed on the label of the grinding tool.
Rotating the Machine Head
 Before any work on the machine itself, pull the mains 
plug.
The machine head can be 
rotated with respect to 
the machine housing in 
90° steps. In this manner, 
the On/Off switch can be 
brought into a more con-
venient position for spe-
cial working situations, 
e. g., for cutting opera-
tions using the cutting 
guide with dust extrac-
tion protection guard 24 or for left-handed persons.
Completely unscrew the four screws. Rotate the machine 
head carefully, without removing it from the housing, to the 
new position. Screw in and tighten the four screws again.
Dust/Chip Extraction
 Dusts from materials such as lead-containing coatings, 
some wood types, minerals and metal can be harmful to 
one’s health. Touching or breathing-in the dusts can cause 
allergic reactions and/or lead to respiratory infections of 
the user or bystanders.
Certain dusts, such as oak or beech dust, are considered 
as carcinogenic, especially in connection with wood-treat-
ment additives (chromate, wood preservative). Materials 
containing asbestos may only be worked by specialists.
– As far as possible, use a dust extraction system suitable 
for the material.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the mate-
rials to be worked.
 Prevent dust accumulation at the workplace. Dusts can 
easily ignite.
Operation
Starting Operation
 Observe correct mains voltage! The voltage of the pow-
er source must agree with the voltage specified on the 
nameplate of the machine. Power tools marked with 
230 V can also be operated with 220 V.
When operating the machine with power from mobile genera-
tors that do not have sufficient reserve capacity or are not 
equipped with suitable voltage control with starting current 
amplification, loss of performance or untypical behavior can 
occur upon switching on.
Please observe the suitability of the power generator being 
used, particularly with regard to the mains voltage and fre-
quency.
Switching On and Off
To start the power tool, press the On/Off switch 2 forward 
and then down.
To lock-on the pressed On/Off switch 2, push the On/Off 
switch 2 further forward.
To switch off the power tool, release the On/Off switch 2, or 
when it is locked, briefly press the On/Off switch 2 and then 
release it.
To save energy, only switch the power tool on when using it.
Switch Version without Lock-on (country-specific):
To start the power tool, press the On/Off switch 2 forward 
and then down.
To switch off the machine, release the On/Off switch 2.
 Check grinding tools before using. The grinding tool 
must be mounted properly and be able to move freely. 
Carry out a test run for at least one minute with no load. 
Do not use damaged, out-of-centre or vibrating grind-
ing tools. Damaged grinding tools can burst and cause in-
juries.
Restarting Protection (GWS 20-230 JH)
The restarting protection feature prevents uncontrolled re-
starting of the machine after an interruption in the power sup-
ply.
To restart the operation, switch the On/Off switch 2 to the 
Off position and start the machine again.
Reduced starting current (GWS 20-230 JH)
The electronic reduced starting current limits the power con-
sumption when switching the tool on and enables operation 
from a 13 ampere fuse.
Note: When the machine runs at full speed immediately after 
switching on, the reduced starting current and the restarting 
protection have failed. The power tool should be sent imme-
diately to an after-sales service (for addresses, see section 
“After-sales Service and Application Service”.

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