SMC Networks MGJ Series User manual

Miniature Guide Rod Cylinder
6
10
23 + Stroke
25 + Stroke
29
33
14.5
17
Unit: mm
Dimensions
Bore size Overall length Width Height
6
10
5
27.3
40.6
10
33.0
48.0
15
38.4
55.6
20
-
63.2
Unit: g
Standard stroke (mm)
Weight
Bore size
(mm)
Overall length
Width
5
6
5101520
-
Standard stroke (mm) Cushion Auto switch
Rubber bumper
(Both sides) D-F8첸
Series Variations
Guide rod size
(mm)
6
10
Bore size
(mm)
MGJ
Series
Actual
size
(MGJ6-5)
앬Mounting from 2
directions
앬Two auto switches can be
mounted even for 5 mm
strokes
앬Integral wiring/piping
to one direction
Series MGJ
±
0.1˚
Height
CAT.ES20-181 -UK
A
Non-rotating
accuracy
:

How to Order
1
Miniature Guide Rod Cylinder
ø6, ø10
Series MGJ
MGJ
Bore size
Nil
S
Miniature Guide Rod Cylinder
Cylinder stroke (mm)
Refer to the following table 햲and 햳.
Number of auto switches
2 pcs.
1 pc.
6
10
6 mm
10 mm
Auto switch type
Miniature Guide
Rod Cylinder
Nil
6 10 F8N
Without auto switch (built-in magnet cylinder)
∗Select the applicable auto switch from the table below.
∗Auto switch is shipped together (not assembled).
∗Minimum stroke for auto switch mounting is 4 mm.
6
10
Bore size (mm) Standard stroke (mm)
5, 10, 15
5, 10, 15, 20
Table 햲Standard strokes
6
10
Example
Bore size (mm) Applicable stroke (mm)
1 to 15 (Spacer type)
1 to 20 (Spacer type)
Model no.: MGJ6-9
Installing a 1 mm width spacer for MGJ6-10
External size: same as MGJ6-10
Table 햳Intermediate stroke (by the 1 mm stroke)
∗Lead wire length symbols: 0.5 m ............. Nil (Example) F8N
3m................ L (Example) F8NL
5m................ Z (Example) F8NZ
∗Auto switches marked with 쎻are produced upon receipt of order.
∗When using non-applicable auto switches, please consult with SMC.
Type Special
function
Electrical
entry
Indicator
light
Wiring
(output)
Load voltage
DC
Direct
mounting
F8N
F8P
F8B
쏹
쏹
쏹
쏹
쏹
쏹
쎻
쎻
쎻
IC
circuit Relay
PLC
–
0.5
(Nil)
3
(L)
5
(Z)
Auto switch part no.
Lead wire length (m) Applicable load
Table 햴Applicable auto switches/Refer to page 6 for detailed auto switch specifications.
– Yes 24 V
5 V
12 V
12 V
3-wire
(NPN)
3-wire
(PNP)
2-wire
Grommet
(Perpen-
dicular)
Solid state switch

2
Miniature Guide Rod Cylinder
Series MGJ
Specifications
Theoretical Output
Weight
Action
Fluid
Proof pressure
Maximum operating pressure
Minimum operating pressure
Ambient and fluid temperature
Cushion
Lubrication
Piston speed
Thread tolerance
Stroke length tolerance
Port size
Guide size
Bore size (mm)
Double acting
Air
M3
JIS class 2
610
1.05 MPa
0.7 MPa
0.15 MPa
ø5 ø6
–10 to 60°C (with no freezing)
Rubber bumper at both ends
Non-lube
+1.0
0mm
Note) Within allowable kinetic energy use only
Bore size
(mm)
Rod size
(mm)
Operating
direction
Piston area
(mm2)
Operating pressure (MPa)
0.15 0.3 0.5 0.7
6
10
OUT
IN
OUT
IN
28.3
21.2
78.5
58.9
4.24
3.18
11.77
8.83
8.48
6.36
23.55
17.67
27.3
40.6
33.0
48.0
38.4
55.6
–
63.2
14.15
10.60
39.25
29.45
19.81
14.84
54.95
41.23
3
5
OUT IN
Unit: N
Unit: g
Bore size (mm) Standard stroke (mm)
5101520
6
10
50 to 500 mm/s Note)
Plate Non-rotating Accuracy
±0.1°
Bore size
(mm) Non-rotating accuracy θ
6
10
+θ
- θ
Allowable Rotational Torque of Plate
For the rotational torque (T) added to the plate (rod end), use a value no more
than the values in the table. Operation outside of this range may cause excessive
impact, which may result in the damage to the devices.
0.92
4.75
Bore size
(mm)
Stroke (mm)
5
0.73
3.96
10
0.61
3.36
15
2.87
–
20
6
10
Unit: cN.m
TT
∗ When extending the cylinder (initial value), non-rotating accuracy θ, without loads and
deflection of guide rods, it should be a value no more than the value in the table as a guide.
This product should not be used as a stopper.
Caution

3
Series MGJ
Allowable Kinetic Energy
6
0.012
0.05 to 0.5
0.035
Bore size (mm)
Operating piston speed (m/s)
Allowable kinetic energy (J)
10
When driving the cylinder with inertial load, keep kinetic
energy no more than the allowable value. The area
between bold lines in the below graphic shows the
relation between load weight and maximum speed.
Plate Allowable Lateral Load
When the eccentric distance (L) generates from the plate
(rod end), be sure to keep the load weight (W) no more
than a value in the below graphic. Operation outside of
this range may cause excessive impact, which may result
in the damage to the devices.
Construction
L
W
L
W
Parts list
No. Description Material Note
Body
Rod cover
Piston
Piston rod
Magnet retainer
Seal retainer
Guide rod
Plate
Torque socket head bolt
Hexagon socket head cap screw
Brazier head hexagon socket bolt
Bumper
Magnet
Bushing
Rod seal
Piston seal
O-ring
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
9
Hard anodized
Chromated
Chromated
Chromated, in case of ø6
In case of ø10
Chromated, in case of ø6
In case of ø10
Hard chromium electroplated
Hard anodized
Nickel plated, in case of ø6
Nickel plated, in case of ø10
Nickel plated
Aluminum alloy
Aluminum alloy
Aluminum alloy
Stainless steel
Aluminum alloy
Stainless steel
Aluminum alloy
Stainless steel
Constructional steel
Aluminum alloy
Constructional steel
Constructional steel
Constructional steel
Resin
Magnet
Sintered oil-impregnated beaning
NBR
NBR
NBR
ø10
100
80
60
40
20
00 5 10 15 20
5st 10st 15st
Load weight W (g)
Eccentric distance L (mm)
ø6
300
250
200
150
100
50
00 5 10 15 20
5st 10st 15st 20st
Load weight W (g)
Eccentric distance L (mm)
o!0!6 wi!4 !3 yu r!1 qt!2 !5 e!1
Load weight (kg)
Maximum speed (m/s)
ø10
100
1
0.01 1.00.1
10
0.1
0.01
ø6

4
Miniature Guide Rod Cylinder
Series MGJ
Dimensions
ø6
ø10
[ 6.7]
9 + Stroke
9
23 + Stroke
8.4
ø5
12
ø3ø5
6
29
20.5
14.5
6
18.5 + Stroke3.5
20.5
2
[ 23.3]
28
20.5
9
2-ø3.3 through
Counterbore ø6.2 depth 0.5
4 x M3 depth 5
2-ø1.2
(Guide air release)
2-M3 x 0.5
(port size)
[Auto switch]
2 x M2.5 through
6.1 + Stroke
[ 6.7]
ø6
25 + Stroke
15
ø5
7.5
17
8
33 23
10
[ 24.5]
32 23 11
5
ø6
23
3
19 + Stroke
8.6
10.5 + Stroke
2-M3 x 0.5
(Bore size)
2-ø2 through
(Guide air release)
4 x M4 depth 5 2 x M3 through
2-ø4.3 through
Counterbore ø8 depth 0.5
5.4 + Stroke
[Auto switch]

5
Auto Switches/Proper Mounting Position for Stroke End Detection
Auto Switch Mounting
Series MGJ
Bore size Operating range
ø6
ø10
1.6
1.3
0.9
1.7
3
4
A B
(mm)
• Use a watchmakers screw driver with a handle about 5 to 6 mm in diameter
when tightening the auto switch mounting screw.
• Tightening torque of auto switch mounting screw should be set 0.10 to 0.20 N.m.
BA
Watchmakers screw driver
Auto switch mounting screw

6
Auto Switch Common Specifications
Lead Wire Length
Type
Operating time
Impact resistance
Insulation resistance
Withstand voltage
Ambient temperature
Enclosure
Solid state switch
1 ms or less
1000 m/s2
1000 VAC for 1 minute
(between lead wire and case)
50 MΩor more at 500 VDC M (between lead wire and case)
–10 to 60°C
IEC529 standard IP67,
JISC0920 waterproof construction
Series MGJ
Auto Switch Common Specifications
Lead Wire Colour Change
D
-
F8P
Lead wire length
Lead wire length indication
(Example)
Nil
L
Z
0.5 m
3 m
5 m
L
Note 1) Lead wire length Z: 5 m applicable auto switch
Solid state switch: All types are produced upon receipt of order.
Note 2) For solid state with flexible wire specification, add –61 after the lead wire length.
D
-
F8PL
-
Flexible specification
(Example) 61
Output (+)
Output (–)
Red
Old
Black
Brown
New
Blue
2-wire 3-wire
Power supply (+)
Power supply GND
Red
Old
Black
Brown
New
Blue
Output White Black
Lead wire colours of SMC switches have been changed for production
beginning September 1996 and thereafter. Please refer to the tables provided.
Special care should be taken regarding wire polarity during the time that the old
colours still coexist with the new colours.

7
Series MGJ
Auto Switch Connections and Examples
Basic Wiring
Solid state 3-wire, NPN
• Sink input specifications
3-wire, NPN
앬3-wire
2-wire
• Souce input specifications
3-wire, PNP
OR connection for NPN output
2-wire with 2-switch AND connection 2-wire with 2-switch OR connection
2-wire 2-wire
Solid state 3-wire, PNP
Power supply Internal
Load voltage at ON = voltage –voltage drop x 2 pcs.
= 24 V - 4 V x 2 pcs.
= 16 V
Example: Power supply is 24 VDC.
Internal voltage drop in switch is 4 V.
Load voltage at OFF = Leakage current x 2 pcs. x Load impedance
= 1 mA x 2 pcs. x 3 kΩ
= 6 V
Example: Load impedance is 3 kΩ.
Leakage current from switch is 1 mA.
(Power supplies for switch and load are separate.)
Switch 1
Switch 2
Load
Brown
Black
Blue
Brown
Black
Blue
Switch 1
Brown
Switch 2
Black
Blue Relay
Relay
Brown
Black
Blue
Load
Relay
contact
Switch 1
Switch 2
Brown
Blue
Brown
Blue
Load
Switch 1
Switch 2
Brown
Blue
Brown
Blue
Load
Switch
main
circuit
Brown
Black
Blue
Load
Brown
Black
Blue
Switch
main
circuit
Load
Switch
main
circuit
Brown
Black
Blue
Load
Switch
main
circuit
Brown
Blue
Load
Brown
Blue
Switch
main
circuit
Load
Switch
Input
Black
COM
Brown
Blue
Switch
Input
Blue COM
Brown
Switch
Input
Black
PLC internal circuit
COM
Brown
Blue
PLC internal circuit
PLC internal circuit
PLC internal circuit
Switch
Input
Blue
COM
Brown
Connection Examples for AND (Series) and OR (Parallel)
Examples of Connection to PLC (Programable Logic Controller)
(Solid state)
AND connection for NPN output
(using relays)
Switch 1
Brown
Switch 2
Black
Blue Load
Brown
Black
Blue
AND connection for NPN output
(performed with switches only)
The indicator lights will light up
when both switches are turned ON.
(Solid state)
When two switches are
connected in series, a load
may malfunction because
the load voltage will decline
when in the ON state.
The indicator lights will light
up if both of the switches
are in the ON state.
When two switches are
connected in parallel,
malfunction may occur
because the load volta-
ge will increase when in
the OFF state
Connect according to the applicable
PLC input specifications, as the
connection method will vary depending
on the PLC input specifications.

8
Grommet
D-F8N
D-F8B
D-F8P
Auto Switch Specifications
Dimensions
Auto switch part No.
Electrical entry direction
Wiring type
Output type
Applicable load
Power supply voltage
Current consumption
Load voltage
Load current
Internal voltage
drop
Leakage current
Indicator light
D-F8N
Perpendicular
NPN
28 VDC or less
40 mA or less
D-F8B
Perpendicular
2-wire
–
24 VDC relay, PLC
–
–
24 VDC (10 to 28 VDC)
2.5 to 40 mA
4 V or less
0.8 mA or less at 24 VDC
D-F8P
Perpendicular
PNP
–
80 mA or less
0.8 V or less
앬Lead wires
Oilproof vinyl heavy insulation cable, ø2.7
D-F8N, D-F8P 0.15 mm2x 3-cores (Brown, Black, Blue [Red, White, Black]), 0.5 m
D-F8B 0.18mm2x 2-cores (Brown, Blue [Red, Black]), 0.5 m
Note 1) Refer to page 6 for auto switch common specifications.
Note 2) Refer to page 6 for lead wire lengths.
D-F8N, D-F8P, D-F8B
1.5 V or less
(0.8 V or less at 10 mA
load current)
Red LED lights when ON
100 μA or less at 24 VDC
OUT
Black
DC (+)
Brown
DC (
– )
Blue
DC (+)
Brown
DC (
– )
Blue
OUT
Black
OUT (+)
Brown
OUT (
– )
Blue
PLC: Programable Logic Controller
Solid State Switches: Direct Mounting Type
D-F8N/D-F8P/D-F8B
3-wire
IC circuit, 24 VDC relay, PLC
5, 12, 24 VDC (4.5 to 28 VDC)
10 mA or less
Mounting screw M2.5 x 4l
Slotted set screw
Indicator light
Most sensitive position
10
4.6
2.8
2
4.3
ø2.7
4
3.1 10.9 3
8
Auto switch internal circuit Weight
Auto switch part No.
0.5
3
5
D-F8N
7
32
52
D-F8P
7
32
52
D-F8B
7
32
52
Operating precautions
Caution
Unit: (g)
Lead wire length
(m)
Fix the switch with appropriate screw
installed on the switch body. If using other
screws, switch may be damaged.
Switch
main circuit
Switch
main circuit
Switch
main circuit
Refer to www.smcworld.com for details of
products compatible with overseas standards.

9
Safety Instructions
Series MGJ
These safety instructions are intended to prevent a hazardous situation and/or
equipment damage. These instructions indicate the level of potential hazard by a label of
“Caution”, “Warning” or “Danger”. To ensure safety, be sure to observe ISO 4414 Note 1),
JIS B 8370 Note 2 and other safety practices.
1. The compatibility of pneumatic equipment is the responsibility of the person
who designs the pneumatic system or decides its specifications.
Since the products specified here are used in various operating conditions, their compatibility with the
specific pneumatic system must be based on specifications or after analysis and/or tests to meet your
specific requirements. The expected performance and safety assurance will be the responsibility of the
person who has determined the compatibility of the system. This person should continuously review the
suitability of all items specified, referring to the latest catalogue information with a view to giving due
consideration to any possibility of equipment failure when configuring a system.
2. Only trained personnel should operate pneumatically operated machinery
and equipment.
Compressed air can be dangerous if handled incorrectly. Assembly, handling, or maintenance of
pneumatic systems should be performed by trained and experienced operators.
3. Do not service machinery/equipment or attempt to remove components until
safety is confirmed.
1. Inspection and maintenance of machinery/equipment should only be performed once measures to
prevent falling or runaway of the driven object have been confirmed.
2. When equipment is to be removed, confirm the safety process as mentioned above. Cut the supply
pressure for this equipment and exhaust all residual compressed air in the system.
3. Before machinery/equipment is restarted, take measures to prevent shooting-out of cylinder piston rod,
etc.
3. Contact SMC if the product is to be used in any of the following conditions:
1. Conditions and environments beyond the given specifications, or if product is used outdoors.
2. Installation on equipment in conjunction with atomic energy, railway, air navigation, vehicles, medical
equipment, food and beverages, recreation equipment, emergency stop circuits, clutch and brake
circuits in press applications, or safety equipment.
3. An application which has the possibility of having negative effects on people, property, or animals,
requiring special safety analysis.
Caution : Operator error could result in injury or equipment damage.
Warning : Operator error could result in serious injury or loss of life.
Danger : In extreme conditions, there is a possible result of serious injury or loss of life.
Note 1) ISO 4414: Pneumatic fluid power -- General rules relating to systems
Note 2) JIS B 8370: Pneumatic System Axiom
Warning

10
Series MGJ
Actuator Precautions 1
Be sure to read before handling.
1. There is a possibility of dangerous sudden
action by air cylinders if sliding parts of ma-
chinery are twisted due to external forces, etc.
In such cases, human injury may occur; e.g., by catching hands
or feet in the machinery, or damage to the machinery itself may
occur. Therefore, the machine should be adjusted to operate
smoothly and designed to avoid such dangers.
2. A protective cover is recommended to mini-
mize the risk of personal injury.
If a stationary object and moving parts of a cylinder are in close
proximity, personal injury may occur. Design the structure to
avoid contact with the human body.
3. Securely tighten all stationary parts and con-
nected parts so that they will not become loose.
Especially when a cylinder operates with high frequency or is
installed where there is a lot of vibration, ensure that all parts
remain secure.
4. A deceleration circuit or shock absorber may
be required.
When a driven object is operated at high speed or the load is
heavy, a cylinder’s cushion will not be sufficient to absorb the im-
pact. Install a deceleration circuit to reduce the speed before cus-
hioning, or install an external shock absorber to relieve the impact.
In this case, the rigidity of the machinery should also be examined.
5. Consider a possible drop in circuit pressure
due to a power outage, etc.
When a cylinder is used in a clamping mechanism, there is a
danger of work pieces dropping if there is a decrease in clam-
ping force due to a drop in circuit pressure caused by a power
outage, etc. Therefore, safety equipment should be installed to
prevent damage to machinery and human injury. Suspension
mechanisms and lifting devices also require consideration for
drop prevention.
6. Consider a possible loss of power source.
Measures should be taken to protect against bodily injury and
equipment damage in the event that there is a loss of power to
equipment controlled by pneumatics, electricity, or hydraulics.
7. Design circuitry to prevent sudden lurching
of driven objects.
When a cylinder is driven by an exhaust centre type directional
control valve or when starting up after residual pressure is ex-
hausted from the circuit, etc., the piston and its driven object
will lurch at high speed if pressure is applied to one side of the
cylinder because of the absence of air pressure inside the cylin-
der. Therefore, equipment should be selected and circuits de-
signed to prevent sudden lurching, because there is a danger
of human injury and/or damage to equipment when this occurs.
8. Consider emergency stops.
Design so that human injury and/or damage to machinery and
euqipment will not be caused when machinery is stopped by a
safety device under abnormal conditions, a power outage or a
manual emergency stop.
9. Consider the action when operation is restar-
ted after an emergency stop or abnormal stop.
Design the machinery so that human injury or equipment dama-
ge will not occur upon restart of operation.
When the cylinder has to be reset at the starting position, install
safe manual control equipment.
1. Check the specifications.
The products featured in this catalogue are designed for use in
industrial compressed air systems. If the products are used in
conditions where pressure and/or temperature are outside the
range of specifications, damage and/or malfunctions may oc-
cur. Do not use in these conditions. (Refer to specifications.)
Consult with SMC if you use a fluid other than compressed air.
2. Intermediate stops
When intermediate stopping of a cylinder piston is performed
with a 3-position closed center type directional control valve, it is
difficult to achieve stopping positions as accurately and precisely
as with hydraulic pressure due to the compressibility of air.
Furthermore, since valves and cylinders are not guaranteed for
zero air leakage, it may not be possible to hold a stopped
position for an extended period of time. Contact SMC in case it
is necessary to hold a stopped position for an extended period.
Selection
Design
Design
1. Operate the piston in such a way that collision
damage will not occur at the stroke end.
The operation range should prevent damage from occurring
when a piston, having inertial force, stops by striking the cover
at the stroke end. Refer to the cylinder model selection proce-
dure for the maximum usable stroke.
2. Use a speed controller to adjust the cylinder
drive speed, gradually increasing from a low
speed to the desired speed setting.
Warning Warning
Caution
Caution
1. Be sure to connect so that the rod axis is alig-
ned with the load and movement direction.
If they are not aligned, stress could be applied to the rod and
the tube, causing the inner surface of the tube, the bushing, the
rod surface, and the seals to wear and to become damaged.
2. When using an external guide, connect the rod
end and the load in such a way that there is no
interference at any positions within the stroke.
3. Do not scratch or gouge the sliding parts of
the cylinder tube or piston rod by striking or
grasping them with other objects.
Cylinder bores are manufactured to precise tolerances, so that
even a slight deformation may cause malfunction.
Also, scratches or gouges in the piston rod may lead to dama-
ged seals and cause air leakage.
Scratches or dent on the sliding parts of guide rods may lead to
damaged bearing and can cause decreased non-rotating accu-
racy and malfunction.
4. Do not use until you can verify that equip-
ment can operate properly.
After mounting, repairs, or modification, etc., connect the air
supply and electric power, and then confirm proper mounting by
means of appropriate function and leak tests.
5. Instruction manual
The product should be mounted and operated after the instruction
manual is thoroughly read and its contents are understood.
Keep the instruction manual where it can be referred to as needed.
Mounting

11
Air Supply
1. Preparation before piping
Before piping is connected, it should be thoroughly blown out
with air (flushing) or washed to remove chips, cutting oil and ot-
her debris from inside the pipe.
2. Wrapping of sealant tape
When screwing together pipes and fittings, be certain that chips
from the pipe threads and sealing material do not get inside the
piping.
Also, when sealant tape is used, leave 1.5 to 2 thread ridges
exposed at the end of the pipe.
1. Install air filters
Install air filters at the upstream side of valves. The filtration
degree should be 5 μm or finer.
2. Install an after cooler, air dryer, or water se-
parator (Drain Catch).
Air that includes much drainage can cause malfunction of valves
and other pneumatic equipment. To prevent this, install an after-
cooler, air dryer or water separator, etc.
3. Use the product within the specified range of
fluid and ambient temperature.
Take measures to prevent freezing when below 5°C, since
moisture in circuits can freeze and cause damage to seals and
lead to malfunctions.
Piping
Wrapping
direction
Sealant tape
Expose approx. 2 threads
Caution Caution
1. Use clean air.
Do not use compressed air that includes chemicals, synthetic
oils containing organic solvents, salt or corrosive gases, etc.,
as it can cause damage or malfunction.
Air Supply
Air Supply
Warning
Series MGJ
Actuator Precautions 1
Be sure to read before handling.
1. Lubrication of non-lube type cylinder.
The cylinder is lubricated for life at the factory and can be
used without any further lubrication.
However, in the event that additional cylinder lubrication is re-
quired, be sure to use polyalphaolefin oil or equivalent oil.
Stopping lubrication later may lead to malfunctions because
the new lubricant will cancel out the original lubricant. Therefo-
re, lubrication must be continued once it has been started.
Lubrication
Caution 1. Do not use in environments where there is a
danger of corrosion.
Refer to the construction regarding cylinder materials.
2. In dusty locations or where water or oil,
splash on the equipment, take suitable mea-
sures to protect the rod.
3. When using auto switches, do not operate in
an environment with strong magnetic fields.
Operating Environment
Warning
1. Perform maintenance inspection and service
according to the procedures indicated in the
instruction manual.
If handled improperly, malfunction and damage of machinery
or equipment may occur.
2. Removal of components, and supply/exhaust
of compressed air
Before any machinery or equipment is removed, first ensure
that the appropriate measures are in place to prevent the fall or
erratic movement of driven objects and equipment, then cut off
the electric power and reduce the pressure in the system to ze-
ro. Only then should you proceed with the removal of any ma-
chinery and equipment.
When machinery is restarted, proceed with caution after confir-
ming that appropriate measures are in place to prevent cylin-
ders from sudden movement.
Maintenance
1. Drain flushing
Remove drainage from air filters regularly.
Warning
Caution
Refer to SMC’s “Best Pneumatics vol. 4” catalogue for further de-
tails on compressed air quality.

Series MGJ
Auto Switch Precautions 1
Be sure to read before handling.
1. Check the specifications.
Read the specifications carefully and use this product
appropriately. The product may be damaged or malfunction if it
is used outside the range of specifications of current current,
voltage, temperature or impact.
2. Take precautions when multiple cylinders are
used close together.
When two or more auto switch cylinders are lined up in close
proximity to each other, magnetic field interference may cause
the switches to malfunction. Maintain a minimum cylinder
separation of 40 mm. (When the allowable interval is specified
for each cylinder series, use the indicated value.)
3. Pay attention to the length of time that a
switch is ON at an intermediate stroke posi-
tion.
When an auto switch is placed at an intermediate position of
the stroke and a load is driven at the time the piston passes,
the auto switch will operate, but if the speed is too great, the
operating time will be shortened and the load may not operate
properly. The maximum detectable piston speed is:
4. Keep wiring as short as possible.
<Solid state switches>
1) Although wire length should not affect switch function, use a
wire that is 100 m or shorter.
5. Take precautions for the internal voltage
drop of the switch.
<Solid state switches>
1) Generally, the internal voltage drop will be greater with a 2-
wire solid state auto switch than with a reed switch.
• If auto switches are connected in series as shown below,
take note that there will be a large voltage drop because of
internal resistance in the light emitting diodes. (Refer to
internal voltage drop in the auto switch specifications.)
[The voltage drop will be “n” times larger when “n” auto
switches are connected.]
Even though an auto switch operates normally, the load
may not operate.
• Similarly, when operating below a specified voltage, it is
possible that the load may be ineffective even though the
auto switch function is normal.Therefore, the formula below
should be satisfied after confirming the minimum operating
voltage of the load.
Also, note that a 12 VDC relay is not applicable.
Design and Selection
6. Pay attention to leakage current.
<Solid state switches>
With a 2-wire solid state auto switch, current (leakage current)
flows to the load to operate the internal circuit even when in the
OFF state.
If the condition given in the above formula is not met, it will not
reset correctly (stays on). Use a 3-wire switch if this
specification cannot be satisfied.
Moreover, leakage current flow to the load will be “n” times
larger when “n” auto switches are connected in parallel.
7. Do not use a load that generates surge volta-
ge.
<Solid state switches>
Although a zener diode for surge protection is connected at the
output side of a solid state auto switch, damage may still occur
if the surge is applied repeatedly. When a load, such as a relay
or solenoid, which generates surge is directly driven, use a type
of switch with a built-in surge absorbing element.
8. Cautions for use in an interlock circuit
When an auto switch is used for an interlock signal requiring
high reliability, devise a double interlock system to avoid trouble
by providing a mechanical protection function, or by also using
another switch (sensor) together with the auto switch.
Also perform periodic maintenance inspections and confirm
proper operation.
9. Ensure sufficient clearance for maintenance
activities.
When designing an application, be sure to allow sufficient
clearance for maintenance and inspections.
Load
Warning
12
V (mm/s) = Auto switch operating range (mm)
Load operating time (ms)  1000
Supply
voltage
Internal voltage
drop of switch
Minimum operating
voltage of load
–>
>
Current to operate load
(OFF condition)
Leakage
current

1. Do not drop or bump.
Do not drop, bump or apply excessive impacts (1000 m/s2or
more for solid state switches) while handling. Although the body
of the switch may not be damaged, the inside of the switch
could be damaged and cause a malfunction.
2. Do not carry a cylinder by the auto switch
lead wires.
Never carry a cylinder by its lead wires. This may not only
cause broken lead wires, but it may cause internal elements of
the switch to be damaged by the stress.
3. Mount switches using the proper tightening
torque.
When a switch is tightened beyond the range of fastening
torque, the mounting screws or switch may be damaged.
On the other hand, tightening below torque range may allow the
switch to slip out of position. (Refer to page 5 for switch
mounting, movement and tightening torque, etc.)
5. Do not allow short circuiting of loads.
<Solid state switches>
All models of PNP output type switches do not have built-in
short circuit protection circuits. If loads are short circuited, the
switches will be instantly damaged, as in the case of reed
switches.
Take special care to avoid reverse wiring with the brown [red]
power supply line and the black [white] output line on 3-wire
type switches.
6. Avoid incorrect wiring.
<Solid state switches>
1) Even if connections are reversed on a 2-wire type switch,
the switch will not be damaged because it is protected by a
protection circuit, but it will remain in a normally ON state.
But reverse wiring in a load short circuit condition should be
avoided to protect the switch from being damaged.
2) Even if power supply line (+) and power supply line (–)
power supply line connections are reversed on a 3-wire type
switch, the switch will be protected by a protection circuit.
However, if the power supply line (+) is connected to the
blue [black] wire and the power supply line (–) is connected
to the black [white] wire, the switch will be damaged.
Mounting and Adjustment
Mounting and Adjustment
Series MGJ
Auto Switch Precautions 2
Be sure to read before handling.
1. Avoid repeatedly bending or stretching lead
wires.
Broken lead wires will result from repeatedly applying bending
stress or stretching force to the lead wires.
2. Be sure to connect the load before power is
applied.
<2-wire type>
If the power is turned on when an auto switch is not connected
to a load, the switch will be instantly damaged because of
excess current.
3. Confirm proper insulation of wiring.
Be certain that there is no faulty wiring insulation (contact with
other circuits, ground fault, improper insulation between
terminals, etc.). Damage may occur due to excess current flow
into a switch.
4. Do not wire with power lines or high voltage
lines.
Wire separately from power lines or high voltage lines, avoiding
parallel wiring or wiring in the same conduit with these lines.
Control circuits including auto switches may malfunction due to
noise from these other lines.
Wiring
Warning
Warning
Wiring
Warning
13
∗Lead wire colour changes
Old
Red
Black
New
Brown
Blue
Output (+)
Output (
 )
2-wire
Old
Red
Black
White
New
Brown
Blue
Black
Power supply
GND
Output
3-wire
Old
Red
Black
White
Yellow
New
Brown
Blue
Black
Orange
Power supply
GND
Output
Diagnostic output
Solid state
with diagnostic output
Old
Red
Black
White
Yellow
New
Brown
Blue
Black
Orange
Power supply
GND
Output
Latch type
diagnostic output
Solid state with latch
type diagnostic output
Lead wire colours of SMC switches have been changed in order to
meet NECA Standard 0402 for production beginning September,
1996 and thereafter. Please refer to the tables provided.
Special care should be taken regarding wire polarity during the ti-
me that the old colours still coexist with the new colours.

1. Never use in the presence of explosive gases.
The construction of our auto switches does not make them
explosion-proof. Never use them in the presence of an
explosive gas, as this may cause a serious explosion.
2. Do not use in an area where a magnetic field
is generated.
Auto switches will malfunction or magnets inside cylinders will
become demagnetized. (Consult with SMC regarding the
availability of a magnetic field resistant auto switch.)
3. Do not use in an environment where the auto
switch will be continually exposed to water.
Switches satisfy IEC standard IP67 construction (JIS C0920:
watertight construction). Nevertheless, they should not be used
in applications where they are continually exposed to water
splash or spray. This may cause deterioration of the insulation
or swelling of the potting resin inside switches and may lead to
a malfunction.
4. Do not use in an environment with oil or che-
micals.
Consult with SMC if auto switches will be used in an
environment with coolants, cleaning solvents, various oils or
chemicals. If auto switches are used under these conditions for
even a short time, they may be adversely affected by improper
insulation, a malfunction due to swelling of the potting resin, or
hardening of the lead wires.
5. Do not use in an environment with tempera-
ture cycles
Consult with SMC if switches are to be used where there are
temperature cycles other than normal temperature changes, as
they may be adversely affected internally.
6. Do not use in an area where surges are gene-
rated.
<Solid state switches>
When there are units (solenoid type lifters, high frequency
induction furnaces, motors, etc.) which generate a large
amount of surge in the area around cylinders with solid state
auto switches, this may cause deterioration or damage to the
switches. Avoid sources of surge generation and crossed lines.
7. Avoid accumulation of iron debris or close
contact with magnetic substances.
When a large amount of ferrous waste such as machining chips
or welding spatter is accumulated, or a magnetic substance
(something attracted by a magnet) is brought into close
proximity with an auto switch cylinder, it may cause the auto
switch to malfunction due to a loss of the magnetic force inside
the cylinder.
Operating Environment
1. Perform the following maintenance periodi-
cally in order to prevent possible danger due
to unexpected auto switch malfunction.
1) Securely tighten switch mounting screws.
If screws become loose or the mounting position is
dislocated, retighten screws securely after readjusting the
mounting position.
2) Confirm that there is no damage to lead wires.
To prevent faulty insulation, replace switches or repair lead
wires if damage is discovered.
Maintenance
1. Consult SMC concerning water resistance,
elasticity of lead wires, and use at welding si-
tes, etc.
Other
Warning Warning
Warning
Series MGJ
Auto Switch Precautions 3
Be sure to read before handling.
14

1. Do not put hands or fingers, etc. between the
plate and body.
Care should be taken that hands or fingers do not get caught in
between the cylinder body and the plate when air pressure is
applied.
Mounting Mounting
Series MGJ
Specific Product Precautions
Be sure to read before handling.
Warning Caution
2. Do not scratch or dent the sliding parts of the
piston rod and guide rods.
Damage to seals can cause air leakage or malfunction, etc.
3. When mounting the Miniature Guide Rod Cyl-
inder, be sure to use proper tightening torque
for tightening screws.
Caution
MGJ6
MGJ10
BoltModel
M3 x 0.5
M4 x 0.7
1.2
2.7
0.3
0.7
Top mounting Bottom mounting
Proper tightening torque (N.m)
MGJ6
MGJ10
BoltModel
M2.5 x 0.45
M3 x 0.5
0.5
1.0
Proper tightening torque (N.m)
4. Flatness of mounting surface should be less
than 0.02 mm.
When mounting Miniature Guide Rod Cylinder, or mounting
plate to work piece, sideling mounting surface may cause
malfunction.
5. Be sure that the piston rod is extended befo-
re mounting loads.
If loads are mounted to the plate when the piston rods are
retracted, it can lead to distortion of the guides resulting in mal-
function.
6. When mounting loads, be sure to use proper
tightening torque for tightening screws.
w
1. This product should not be used as a stopper.
Others
Caution
SMC CORPORATION (Europe)
Austria [phone] www.smc.at [email protected]
Belgium [phone] www.smcpneumatics.be [email protected]
Bulgaria [phone] www.smc.bg [email protected]
Czech Republic [phone] www.smc.cz [email protected]
Denmark [phone] www.smc-pneumatik.dk [email protected]
Estonia [phone] www.smcpneumatics.ee [email protected]
Finland [phone] www.smc.fi smcfi@smcfi
France [phone] www.smc-france.fr [email protected]
Germany [phone] www.smc-pneumatik.de inf[email protected]
Greece [phone] www.smceu.com [email protected]
Hungary [phone] www.smc-automation.hu [email protected]
Ireland [phone] www.smcpneumatics.ie [email protected]
Italy [phone] www.smcitalia.it [email protected]
Latvia [phone] www.smclv.lv [e-mail]
Netherlands [phone] www.smcpneumatics.nl [e-mail]
Norway [phone] www.smc-norge.no [email protected]
Poland [phone] www.smc.pl [email protected]
Portugal [phone] www.smces.es [email protected]
Romania [phone] www.smcromania.ro [email protected]
Russia [phone] www.smc-pneumatik.ru [email protected]
Slovakia [phone] www.smc.sk [email protected]
Slovenia [phone] www.smc-ind-avtom.si [email protected]
Spain [phone] www.smces.es [email protected]
Sweden [phone] www.smc.nu [email protected]
Switzerland [phone] www.smc.ch [email protected]
Tur key [phone] www.entek.com.tr [email protected]
UK [phone] www.smcpneumatics.co.uk [e-mail]
European Marketing Centre [phone] www.smceu.com
SMC CORPORATION [phone] www.smcworld.com
Specifications are subject to change without prior notice
and any obligation on the part of the manufacturer.
Produced and printed by SMC European Marketing Centre 11/03
Top mounting Bottom mounting