SMC Networks C G5 N Series User manual

Doc. no.CG1＊-OM0001G
PRODUCT NAME
STAINLESS STEEL CYLINDER
MODEL / Series / Product Number
C*G5*N**SR / V-*
C*G5*A**SR / V-*

Contents
Safety Instructions P2
1. Specifications P6
1-1. Specifications
2. Installation and Handling P7
2-1. Air supply
2-2. Design
2-3. Mounting and Installation
2-4. Environment
2-5. Speed control
2-6. Cushion
2-7. Control of direction
2-8. Auto switches
3. Maintenance P16
3-1. Checks
3-2. Replacement of seals
3-3. Consumable parts
3-4. Troubleshooting
4. Basic Circuit for Cylinder Operation P24
5. Construction P25
-1-

Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or equipment damage.
These instructions indicate the level of potential hazard with the labels of “Caution,” “Warning” or “Danger.”
They are all important notes for safety and must be followed in addition to International Standards
(ISO/IEC)*1) , and other safety regulations.
*1) ISO 4414: Pneumatic fluid power -- General rules relating to systems.
ISO 4413: Hydraulic fluid power -- General rules relating to systems.
IEC 60204-1: Safety of machinery -- Electrical equipment of machines .(Part 1: General requirements)
ISO 10218: Manipulating industrial robots -Safety.
etc.
Caution
Caution indicates a hazard with a low level of risk which, if not avoided, could result
in minor or moderate injury.
Warning
Warning
indicates a hazard with a medium level of risk which, if not avoided, could
result in death or serious injury.
Danger
Danger
indicates a hazard with a high level of risk which, if not avoided, will result
in death or serious injury.
Warning
1. The compatibility of the product is the responsibility of the person who designs the equipment or
decides its specifications.
Since the product specified here is used under various operating conditions, its compatibility with specific
equipment must be decided by the person who designs the equipment or decides its specifications based on
necessary analysis and test results.
The expected performance and safety assurance of the equipment will be the responsibility of the person who
has determined its compatibility with the product.
This person should also continuously review all specifications of the product referring to its latest catalog
information, with a view to giving due consideration to any possibility of equipment failure when configuring the
equipment.
2. Only personnel with appropriate training should operate machinery and equipment.
The product specified here may become unsafe if handled incorrectly.
The assembly, operation and maintenance of machines or equipment including our products must be
performed by an operator who is appropriately trained and experienced.
3. Do not service or attempt to remove product and machinery/equipment until safety is confirmed.
1.The inspection and maintenance of machinery/equipment should only be performed after measures to
prevent falling or runaway of the driven objects have been confirmed.
2.When the product is to be removed, confirm that the safety measures as mentioned above are implemented
and the power from any appropriate source is cut, and read and understand the specific product precautions
of all relevant products carefully.
3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.
4. Contact SMC beforehand and take special consideration of safety measures if the product is to
be used in any of the following conditions.
1. Conditions and environments outside of the given specifications, or use outdoors or in a place exposed to
direct sunlight.
2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping,
vehicles, military, medical treatment, combustion and recreation, or equipment in contact with food and
beverages, emergency stop circuits, clutch and brake circuits in press applications, safety equipment or
other applications unsuitable for the standard specifications described in the product catalog.
3. An application which could have negative effects on people, property, or animals requiring special safety
analysis.
4.Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a
mechanical protective function, and periodical checks to confirm proper operation.
-2-

Safety Instructions
Caution
The product is provided for use in manufacturing industries.
The product herein described is basically provided for peaceful use in manufacturing industries.
If considering using the product in other industries, consult SMC
beforehand and exchange
specifications or a contract if necessary.
If anything is unclear, contact your nearest sales branch.
Limited warranty and Disclaimer/Compliance Requirements
The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance
Requirements”.
Read and accept them before using the product.
Limited warranty and Disclaimer
1.The warranty period of the product is 1 year in service or 1.5 years after the product is
delivered,whichever is first.
∗
2)
Also, the product may have specified durability, running distance or replacement parts. Please
consult your nearest sales branch.
2. For any failure or damage reported within the warranty period which is clearly our responsibility,
a replacement product or necessary parts will be provided.
This limited warranty applies only to our product independently, and not to any other damage
incurred due to the failure of the product.
3. Prior to using SMC products, please read and understand the warranty terms and disclaimers
noted in the specified catalog for the particular products.
∗
2) Vacuum pads are excluded from this 1 year warranty.
A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
Also, even within the warranty period, the wear of a product due to the use of the vacuum
pad or failure due to the deterioration of rubber material are not covered by the limited
warranty.
Compliance Requirements
1.
The use of SMC products with production equipment for the manufacture of weapons of mass
destruction(WMD) or any other weapon is strictly prohibited.
2. The exports of SMC products or technology from one country to another are governed by the
relevant
security laws and regulation of the countries involved in the transaction. Prior to the
shipment of a SMC product to another country, assure that all local rules governing that export
are known and f
ollowed.
Caution
SMC products are not intended for use as instruments for legal metrology.
Measurement instruments that SMC manufactures or sells have not been qualified by type approval tests
relevant to the metrology (measurement) laws of each country.
Therefore, SMC products cannot be used for business or certification ordained
by the metrology
(measurement) laws of each country.
The product is provided for use in manufacturing industries.
The product herein described is basically provided for peaceful use in manufacturing industries.
If considering using the product in other industries, consult SMC beforehand and exchange specifications
or a contract if necessary.
契約などを行ってください｡
The product is provided for use in manufacturing industries.
The product herein described is basically provided for peaceful use in manufacturing industries.
If considering using the product in other industries, consult SMC beforehand and exchange specifications
or a contract if necessary.
契約などを行ってください｡
! Caution
SMC products are not intended for use as instruments for legal metrology.
Measurement instruments that SMC manufactures or sells have not been qualified by type approval tests
relevant to the metrology (measurement) laws of each country.
Therefore, SMC products cannot be used for business or certification ordained by the metrology
(measurement) laws of each country.
-3-

- 4 -
Specific Product Precautions
Caution on Design
Operating Environment
Warning
1. Note the weight of the stainless steel products.
Since the weight of stainless steel cylinders is approximately 1.5
to 3 times heavier than the standard products (with aluminum
body), be careful when calculating weight estimates. Also, when
mounting the cylinder on equipment where vibration is expected,
avoid using single side brackets such as the flange type, and use
double side brackets such as the foot type instead.
Caution
1.Adjust the speed control for the environment in which
it will be used.
Speed adjustment may be changed
depending on the
environment.
2.
Dust may accumulate on this product’s mounting
screws and brackets in some operating conditions.
Measures must be applied depending on the operating conditions
when mounting.
Warning
1.Fully consider the compatibility of stainless steel.
The corrosion resistance of stainless steel is not effective against
all media and corrosive environments. Corrosion proceeds rapidly
with strong hydrochloric acid, hydrofluoric acid,
and high
temperature ammonium gas, etc. Therefore its compatibility to the
environment must be considered carefully.
2.Do not operate cylinders with auto switches in
environments where oil and chemicals are used.
Please contact SMC when operating in environments with
coolants, cleaning solvents, various oils or chemicals, as it may
cause adverse effects (faulty insulation, malfunction due to
swelling of the potting resin, and hardening of lead wires, etc) to
auto switches even in a short period of time. Even with the fluoro
rubber seal specification, the auto switch related parts (switch
body, mounting bracket, and built-in magnet) are identical to the
standard specifications. Therefore, consult with SMC regarding
the cylinder’s compatibility (such as chemical resistance) with an
environment (chemicals, etc.) before operating.
3. Do not immerse the cylinder in water or chemicals.
Selection
When the cylinder is operated in a condition with water pressure,
Warning
1.Generally, use nitrile rubber (NBR) seals with liquids
that do not contain chlorine and sulfur, and use fluoro
rubber (FKM) seals with liquids that contain chlorine
and sulfur.
However, depending on the type and the brand of liquid (such as
cleaning solvent) that splashes on the cylinder, the operating life
of seals may be reduced dramatically. In cases where special
additives are used, or where liquid caused trouble with the current
nitrile or fluoro rubber seals in the past, request an investigation
or set up a test period for the use of the seals。
2.
Even the fluoro rubber specification may not be
applicable depending on the type of chemicals and the
operating temperature. Therefore, be sure to verify the
seal's applicability before use.
the fluid leaks into the cylinder in the early stages. In the worst
case, the fluid may back flow inside the piping and damage the
solenoid valve.
注
Caution
1.
Avoid installing and using a cylinder inside a food
zone.
<Not installable>
Food zone･･････････An environment where food which will be
sold as merchandize, directly touches the
cylinder’s components.
<Installable>
Splash zone･･･････An environment where food which will not
be sold as merchandize, directly touches
the cylinder’s components
Mounting
Warning
Non-food zone･･････An environment where there is no
contact with food.
1.Do not rotate the cover.
If a cover is rotated when installing a cylinder or screwing a
fitting into the port, it is likely to damage the junction part with
cover.
2. When using pins, apply grease, etc., in order to
prevent them from degrading of shape and rusting.
Operating Precautions
Warning
2. When cleaning solvent or chemicals splashes on a
cylinder, the service life may be extremely shortened.
Please contact SMC for details.
1.For details about operating precautions, refer to for the
CG1 series.
Caution
1.If cleaning the rot
ating part, grease may leak out,
which shortens product service life. Thus, cleaning
must be as infrequent as possible.
2.If excess water gets into mounting holes, unwanted
bacteria may reproduce. Plug them with plug bolts or
external covers to avoid this.
3.When cleaning cylinders with steam, do it as quickly
as possible, keeping the cylinder’s temperature range
in mind.
4. When cleaning cylinders with a brush, etc., do not
apply excessive force to the weaker parts, such as
auto switch lead wire, etc.

- 5 -
Specific Product Precautions
Maintenance
Warning
1.If this cylinder is lubricated, it maycause malfunctions.
If grease other than designated is used, it may also cause
malfunctions.
•Order with the following part number when only the grease
for maintenance is needed.
Grease pack part number for stainless steel cylinders
Grease for food processing machines: GR-R-010 (10 g)
2. Do not wipe grease attached to the rotating part of the
air cylinder.
If grease attached to the rotating part is forcibly wiped off, it may
cause malfunctions.
If the cylinder is operated for a long period of time, the rotating
part may become black. In such cases, wipe the grease attached
to the rotating part and reapply fresh grease to enable the cylinder
to operate for a long period of time.
(Wipe the grease with water. Using alcohol or solvents may
damage seals.)
Precautions for the CG5-S series
①
Warning
1.Only people who have sufficient knowledge and
experience are allowed to replace seals.
The person who disassembles and reassembles the cylinder is
responsible for the safety of the product. Repeatedly disassem
-bling and reassembling the product may cause wearing or
deformation of the screws as well as a decline in screw tightening
strength. When reassembling the product, be sure to check the
cover and tubing screws for wear, deformities, or any other
abnormalities. Operating the product with damaged screws may
result in the cover or tubing coming off during operation, which
could lead to a serious accident. Caution must be taken to avoid
such incidents.
②
Caution
1.Sealant
∗
is used on the threads of the connecting
sections of the cover and the cylinder tube for airtight
construction. When disassembling the cylinder, the
old sealant must be completely removed, and new
sealant must be applied before re-assembling.
*Loctite® 542 (medium strength) or equivalent
2.ø
50 or larger bore size cylinders cannot be
dis-as-sembled.
When disassembling cylinders with bore sizes of ø20 through
ø40, grip the double flat part of either the head cover or the rod
cover with a vise and loosen the other side with a wrench or a
monkey wrench, etc., and then remove the cover. When
re-tightening, tighten approximately 2 degrees more than the
original position. (Cylinders with ø50 or larger bore sizes are
tightened with a large tightening torque and cannot be
disa
ssembled. Please contact SMC when disassembly is
required.)
3. When replacing seals, take care not to hurt your hand
or finger on the corners of parts.

－
6
－
1. Specifications
1-1 Specifications
Fluid
Air
Proof pressure
1.5MPa
Max. operating pressure
1.0MPa
Min. operating pressure
0.05MPa
Ambient and fluid
temperature
-10 to +70oC. -10 to +60o
(No freezing) C with built-in magnet
Lubrication
Not required (non-lube)
Stroke length tolerance
1 to 1000st +1.4
1001 to 1500st
mm
+1.8
mm
Cushion
Rubber bumper/ Air cushion
Piston speed
ø20 to ø63
50 to 1000mm/sec
ø80 and ø100
50 to 700mm/sec
Action
Double acting, Single rod
Use the actuator with allowable kinetic energy or less.
(Refer to 2-6-3. Allowable kinetic energy (Page 14))
！
Warning
1.Confirm the specifications.
The product is designed only for use in industrial compressed air systems. Do not operate at
pressures, temperatures or kinetic energy beyond the range of specifications, as this can
cause damage to cylinder or malfunction.
(Refer to the specifications.)
Contact SMC in advance for non-industrial uses, or if using with a fluid other than compressed
air.
2.There may be cases in which a speed-reduction circuit or a shock
absorber is required.
If the driven object moves at high speeds or is heavy, it will be unfeasible for only the
cylinder’s cushion to absorb the shock. Therefore, provide a speed-reduction circuit to reduce
the cylinder’s speed before the thrust is applied to the cushion or an external shock absorber
to dampen the shock. If these countermeasures are taken, make sure to take the rigidity of
the mechanical equipment into consideration.
0
0

－
7
－
2. Installation and Handling
2-1. Air supply
The compressed air supplied to the cylinder should be filtered by SMC AF series air filter
and regulated to the specified set pressure by SMC AR series regulator.
！
Warning
1.Use clean air.
Do not use compressed air which contains chemicals, synthetic oils containing organic
solvents, salts or corrosive gases, etc., as this can cause cylinder damage or malfunction.
2.When there is a large amount of drainage
Compressed air containing a large amount of drainage can cause the malfunction of
pneumatic equipment. An air dryer or water separator should be installed upstream from filters.
3.Drain flushing
If condensation in the drain bowl is not emptied on a regular basis, the bowl will overflow and
allow the condensation to enter the compressed air lines. This causes the malfunction of
pneumatic equipment.
If the drain bowl is difficult to check and remove, the installation of a drain bowl with an auto
drain option is recommended.
For detailed information regarding the quality of the compressed air described above, refer to
SMC's "Compressed Air Cleaning System."
！
Caution
1.Do not use ultra-dry air because the lubrication characteristics inside the
equipment will deteriorate and this can affect the reliability (life) of the
product.
If the operating fluid is ultra-dry air, consult SMC.
2.Install an air filter.
Install an air filter upstream near the valve. Select an air filter with a filtration size of 5μm or
smaller.
3.Therefore, take appropriate measures to ensure good air quality, such as
providing an after cooler, air dryer, or water separator.
Compressed air that contains a large amount of drainage can cause malfunction of
pneumatic equipment such as valves. Therefore, take appropriate measures to ensure air
quality, such as providing an after cooler, air dryer, or water separator.
4.Ensure that the fluid and ambient temperature are within the specified
range.
When operating at temperatures below 5o
5.Precautionary measures against condensation
C, water in the circuit may freeze and cause
breakage of seals or malfunction. Corrective measures should be taken to prevent freezing.
For detailed information regarding the quality of the compressed air described above, refer to
SMC's "Compressed Air Cleaning System."
Moisture condensation can occur inside pneumatic systems due to a drop in temperatures
caused by the piping or operating conditions. This can degrade or wash away grease,
resulting in a shortened service life or a malfunction.
For details, refer to the catalog “Precautionary measures against condensation in a
pneumatic system.”
6.Lubricating non-lube type cylinders
These cylinders have been lubricated for life at the factory and can be used without any
further lubrication.

－
8
－
2-2. Design
The compatibility of the product is the responsibility of the person who designs the equipment
or decides its specifications.
！
Warning
1.There is a possibility of dangerous sudden action by air cylinders if
sliding parts of machinery are twisted due to external forces, etc.
In such cases, injury may occur, such as hands or feet getting caught in the machinery, or
damage to the machinery itself may occur. Design the machinery to avoid such dangers.
2.A protective cover is recommended to minimize the risk of personal
injury.
If the moving portion of the product will pose a hazard to humans or will damage machinery
or equipment, provide a construction that prevents direct contact with those areas.
3.Securely tighten all stationary parts and connected parts so that they will
not become loose.
Do not use the product where operation frequency is high or the product is exposed to
vibration.
4.Design the system so that it will not apply an external force over the
maximum force to the product.
The product can break, causing a risk of injury or damage to equipment.
5.The product generates a large force. Install on a sufficiently rigid
mounting base, taking this force into consideration.
There is a risk of injury or damage to equipment.
6.Consider the possibility of a reduction in the circuit air pressure caused
by a power failure.
When a cylinder is used in a clamping mechanism, the work piece may come off due to a
decrease in clamping force because of a decrease in the circuit pressure caused by a
power failure, etc. Therefore, safety equipment should be installed to prevent damage to
machinery and injury. Suspension equipment and lifting devices also require measures to
prevent dropping.
7.Consider a possible loss of power source.
Measures should be taken to prevent injury and equipment damage in the event that there
is a loss of power to equipment controlled by air pressure, electricity or hydraulics, etc.
8.Consider the behavior of the rotary actuator in the event of an emergency
stop.
Devise a safety system so that if a person engages the emergency stop, or if a safety
device is tripped during a system malfunction such as a power outage, the movement of the
cylinder will not cause a hazard to humans or damage the equipment.
9.Consider the action when operation is restarted after an emergency stop
or abnormal stop.
Design the machinery so that injury or equipment damage will not occur upon restart of
operation. When the cylinder has to be reset at the starting position, install manual safety
equipment.
10.Intermediate stop
It is difficult for this product to make a piston stop at the required intermediate position
accurately and precisely using a 3 position closed center type directional control valve,
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
extended periods of time. Contact SMC if it is necessary to hold the stopped position for
extended periods of time.
11.Avoid synchronized operation using cylinders only.
Even if multiple pneumatic cylinders are initially set to the same speed, their speeds may
vary due to changes in operating conditions. Therefore, avoid designs where a single load
is moved by synchronizing multiple cylinder operations.
12.Do not disassemble the product or make any modifications, including
additional machining
Doing so may cause human injury and/or an accident.

－
9
－
13. Refer to the Auto Switches Precautions for using with an auto switch.
14.When a cylinder is used in a clamping, suspending, or lifting mechanism
There is a danger of workpieces dropping if there is a decrease of thrust 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/or human injury
！
Caution
1. Operate the cylinder component parts within a range such that collision
damage will not occur at the stroke end.
For applications where a piston with inertial force strikes a cover and stops at the stroke end,
follow the cylinder model selection procedure (the front matter), or select while taking into
account the allowable kinetic energy indicated in each model’s specifications.
2.Avoid having a large gap between the clevis and mating bushing, as this
exposes the pin to a bending load.
3. Do not let foreign matter such as cutting chips get into the product from
the supply port.
4.Do not touch the cylinder during high speed and high frequency
operation of the cylinder.
When the cylinder is operating at a high speed and high frequency, the cylinder tube
surface temperature increases, and may cause a burn.
5.If pressure is applied to the external cylinder parts, there is a possibility
that air will get inside the cylinder from the rod seal section.
(Example: inside a chamber, etc.)
6.Resumption after a long stop.
When resuming operation after a long stop, there are cases in which the starting pressure
rises or there is a delay in the piston starting time due to adhesion.
Conducting several cycles of running-in operation will solve this problem. Please consider
implementing this before resumption.
7.Do not use the air cylinder as an air-hydro cylinder.
If working fluid of the air cylinder is turbine oil, oil leakage can result.
2-3. Mounting and Installation
！
Warning
1.Ensure sufficient space for maintenance activities.
When installing the products, allow access for maintenance and inspection.
2.Tighten threads with the proper tightening torque.
When installing the products, follow the listed torque specifications.
3.Do not place a magnetic object near the product.
The auto switch is a magnetic sensing type. If a magnetic object is placed close to it, the
actuator could operate suddenly, which could pose a hazard to humans or damage the
machinery and equipment.
4.Do not perform additional machining on the product.
Performing additional machining on the product can result in insufficient strength and cause
damage to the product. This can lead to possible human injury or damage to the
surrounding equipment.
5.Risk to people with pacemakers
As coming into close proximity with strong magnets may interfere with the function of
pacemakers, posing a life-threatening risk to those with pacemakers, they should stay away
from products with built-in magnets or take safety measures to block their magnetic force.
Failure to heed caution may result in the malfunction of electronic equipment such as
pacemakers

－
10
－
！
Caution
1.Do not apply excessive lateral load to the piston rod.
The bold solid lines in Fig. 1 show the allowable lateral load on the cylinder for a certain
stroke length.
Refer to Table 2 Maximum Allowable Kinetic Energy. ( Page 14 )
Fig. 1 Allowable lateral load applied to rod end
2.Cantilever fastening
If a cylinder is actuated at a high speed when mounted with one side fastened and one side
free ( basic type, flange type ) , the bending moment may act on the cylinder due to vibration
at the stroke end, causing damage to the cylinder. In such cases, install a mounting bracket
to suppress the vibration of the cylinder body, or reduce piston speed until the cylinder body
does not vibrate at the stroke end.
Also, use a mounting bracket when moving the cylinder body or mounting a long stroke
cylinder horizontally with one-sided fastening.
3.Be certain to align the rod axis with the load and direction of movement
when connecting.
When not properly aligned, the rod and tube may be twisted, and damage may be caused
due to wear on certain areas, such as the inner tube surface, bushings, rod surface, or
seals.
For off-center loads, we recommend using in combination with a floating joint, etc., for
effective deviation absorption. Confirm the allowable eccentricity and rotating angle before
selecting for use.
Bushing ( bearing )
Cylinder stroke[mm]
Lateral load applied to rod（fR）[N]

－
11
－
4.When an external guide is used, connect the piston rod end and the load in
such a way that there is no interference at any point within the stroke.
5.Refer to the torque in Table-1 when tightening the foot, flange and Plug bolt
to the cylinder.
Table 1 Tightening torque ( Unit: Nm )
Bore size
(mm)
Foot
Flange
Plug bolt
Cushion valve
(Valve retainer)
Cushion valve
(Lock nut)
20
1.5
2.0
0.5
25
2.9
2.0
0.5
32
2.9
2.0
0.5
40
4.9
2.0
0.5
50
11.8
5.0
1.0
63
24.5
5.0
1.0
80
24.5
20.0
2.0
100
42.2
20.0
2.0
6. Do not scratch or gouge the sliding parts of the cylinder tube, piston rod, etc.,
by striking or grasping them with other objects.
Cylinder bores are manufactured to precise tolerances, so even a slight deformation may
cause a malfunction. Also, scratches, gouges, etc., on the piston rod may lead to damaged
seals or cause air leakage.
7.Prevent the stoppage of rotating parts.
Prevent the stoppage of rotating parts ( pins, etc. ) by applying grease.
8.Do not use the product until you have verified that the equipment can operate
properly.
After installation or repair, apply air and power supplies to the equipment and perform
appropriate functional and leakage inspections to make sure the equipment is mounted
properly.
9.Do not let foreign matter such as cutting chips get into the product from the
supply port.
When the product is installed on a machine on site, the debris from drilled mounting holes
can get in the supply port of the product. Take sufficient care to prevent this.
2-4. Environment
！
Warning
1.Do not expose the product to direct sunlight for an extended period of time.
2.Do not use in a place subject to heavy vibration and/or shock.
3.Do not mount the product in locations where it is exposed to radiant heat.
4. When using the cylinder in a dusty environment, or one where it is exposed
to water or oil, install a protective cover over the whole cylinder.
5.When using auto switches, do not operate in an environment with strong
magnetic fields.
6.A decrease in the base oil of grease may be accelerated by the properties of
the compressed air used in pneumatic equipment, the external environment,
operating conditions, etc., and the resulting drop in lubricating performance
may have an effect on the equipment’s service life
7.Avoid storing the product in humid conditions.
Store the product with the piston rod retracted and avoid humidity, in order to prevent
generation of rust.

－
12
－
！
Caution
1.Internal lubricant or the base oil of grease may seep out of the cylinder
depending on the operating conditions. Take great care when a clean
environment is required.
2.Preparation before piping
Before piping, perform air blow ( flushing ) or cleaning to remove any cutting chips, cutting oil,
dust, etc. from the piping and fitting.
3.Wrapping of sealant tape
When screwing piping or fittings into ports, ensure that chips from the pipe threads or sealing
material do not enter the piping.
Also, if sealant tape is used, leave 1.5 to 2 thread ridges exposed at the end of the threads.
Fig. 2 Sealant tape
Wrap this way.
Sealant tape
Leave 2 threads exposed.

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13
－
2-5. Speed control
When the piston speed is adjusted, install SMC AS series speed controller near
the air supply port to adjust to the specified speed. There are two methods of
speed adjustment, one is to restrict air supplied to the product ( meter-in ), and the
other is to restrict air exhausted from the product ( meter-out ). Normally, the
meter-out type should be adopted.
！
Caution
・Piston speed should be controlled gradually from low speed to the
specifiedspeed with a speed controller fully closed.
2-6. Cushion
2-6-1. CG5*N Series/ Rubber bumper
The product has a rubber bumper at both ends of the piston or the cover, which
can soften the shock at stroke end and reduce the noise created during operation
and by the shock. This feature enables the use of the product at a high frequency
or high speed operation.
！
Caution
・When the product is equipped with a rubber bumper, note that there may be a
slight bounce at the stroke end.
2-6-2. CG5*A Series/ Air cushion
The kinetic energy generated by large loads and high speeds is absorbed at the
stroke end using the compressed air, so the parts around the actuator are not
affected by vibration.
！
Caution
1. When the product is shipped, the cushion needle of the cylinder is opened
by 1-2 rotations from fully closed and then the lock nut is tightened. When
using the product, readjust the cushion valve mounted on the cover
according to the level of the operation load and operating speed.
2.When the cushion valve is turned in a clockwise direction, the orifice
becomes smaller and the cushion effectiveness is increased. When the
cushion valve is turned in a counter-clockwise direction, the orifice
becomes larger and the cushion effectiveness is reduced.
3.Tighten the lock nut of the cushion valve according to the tightening torque
in Table 1.
The effectiveness of the cushion will change from the initial setting when the lock nut
becomes loose and the cushion valve rotates. Readjust the lock nut when such a condition
is observed.
4.The cushion seal is subject to wear. The cushion effectiveness therefore
changes in the product operation over an extended period of time.
Readjust the cushion as necessary.
5.If the cushion valve is fully closed, the piston may bounce at the end of
stroke and not move through the full stroke, or the cushion seal may
become damaged due to excessive pressure. Do not fully close the
cushion valve.
6.If the cushion valve is opened too much, the cylinder will operate like
cylinders without an air cushion, and the impact force will be extremely
large.
7.Air cushion is not for reducing the piston speed around the stroke end.

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14
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2-6-3. Allowable kinetic energy
The applied kinetic energy must be within the allowable value when an inertial load
is actuated.
Please refer to "Fig.1 Allowable lateral load applied to rod end ". ( Page 10)
Table 2 Allowable kinetic energy
CG5
N
A
Formula
E= ( m/ 2 )×v2
E ：Kinetic energy ( J )
m : Load mass ( Kg )
v ：Max. piston speed ( m/s )
E≦E max ( J )
Should be satisfied.
Bore size( mm )
E max ( J )
E max ( J )
20
0.28
0.42
25
0.41
0.65
32
0.66
0.91
40
1.2
1.8
50
2.0
3.4
63
3.4
4.9
80
5.9
11.8
100
9.9
16.7
！
Warning
・Use the actuator with allowable kinetic energy ( Table 2 ) or less.
Operation with a kinetic energy over the allowable value can break the product and cause
injury or damage to equipment. If excessive kinetic energy is expected, install an external
absorber to prevent impact to the body of the product. In this case, please verify the rigidity
of the equipment carefully.
2-7. Control of direction
To switch the operating direction of the cylinder, mount an applicable solenoid valve selected
from SMC's range of solenoid valves.
！
Warning
・Design a circuit to prevent sudden action of a driven object.
When the product is actuated by an exhaust center type directional control valve or when one
side of the piston is pressurized with air exhaust, such as when the product is started after the
exhaust of the residual pressure from the circuit, driven objects may act suddenly at high
speed. In such cases, injury may occur, such as hands or feet getting caught in the machinery,
or damage to the machinery itself may occur. Design the machinery to avoid such dangers.

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15
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2-8. Auto switches
When an auto switch is mounted or its set position is changed, refer to Fig. 3.
！
Caution
1.Use a specific mounting bracket ( Table 3 ) and mount the product so that
the band of the bracket will be perpendicular to the stroke of the product.
2.Tighten mounting screws to the appropriate torque.
3.The auto switch can only be used for cylinders with a built-in magnet for
auto switch ( e.g. CDG5 ).
(1) Wind a band on the cylinder tube to roughly set the
auto switch mounting position.
(2) Put the mounting part of the auto switch between the
clasps of the band of the bracket, and match the
mounting hole of the switch to the holes of the clasp
(3) Turn the mounting screw slightly into the threads of the
band through the mounting hole.
Fig. 3 Mounting and movement of the auto switch
(4) Confirm where the detecting position is, and tighten the
mounting screw to fix the auto switch. ( The tightening
torque of the M4 screw must be 1 to 1.2Nm. )
(5) The
detection position can be changed under the
conditions in step 3.
Table3 Auto Switch Mounting Bracket / Part No.
*With stainless steel mounting screws.
D-G5BA
Minimum Stroke for Auto Switch Mounting
Mounting
bracket
Basic type, Foot type, Flange type, Clevis type
Number of auto
switches
1
(Rod cover side)
2
(Different sides)
2
(Same side)
Switch mounting
side
Port side
Port side
Port side
Minimum
stroke
（ｍｍ）
10 20 75
Auto switch
Auto switch
mounting band
Auto switch
mounting screw
M4x0.7x22L
Applicable bore size (mm)
20
NBA-088S
25
NBA-106S
32
BGS1-032S
40
BAF-04S
50
BAF-05S
63
BAF-06S
80
BAF-08S
100
BAF-10S
Auto switch

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16
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3. Maintenance
3-1. Checks
The following checks are required for proper cylinder operation.
1. Smooth operation
2. Changes in piston speed and cycle time
3. Abnormal stroke
4. Looseness of mounting bolt and rod end nuts
5. Looseness of mounting frame and excessive deflection
6. Internal and external leakage (Change in output)
7. Damage to the piston rod sliding surface
8. Clogging and discharge drainage of the air filter
9. Lubrication of rotating parts ( double knuckle joint, clevis pin, etc. )
10. Position of auto switches
When any abnormality is found as a result of checking the points above, eliminate causes and
take necessary measures such as retightening screws and the application of grease. Contact
SMC sales if it is necessary to repair the cylinder.
！
Warning
1.As a minimum, maintenance should be performed according to the above
items. Perform additional maintenance as necessary.
If handled improperly, human injury and/or malfunction or damage of machinery and
equipment may occur
2.Maintenance work
If handled improperly, compressed air can be dangerous. Assembly, handling, repair, and
element replacement of pneumatic systems should be performed by a knowledgeable and
experienced person.
3.Drain flushing
Remove drainage from air filters regularly
4.Removal of equipment, and supply/exhaust of compressed air.
Ensure that drop prevention measures and safe lock out of the moving parts are taken, the
power of the facility and supply air is shut off and the compressed air in the system is
exhausted before removing the equipment.
Before restarting the equipment, confirm that measures are taken to prevent sudden action.

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17
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3-2. Replacement of seals
It is possible to replace the rod seal and piston seal for ø20 to ø40.
Replacement of the rod seal may be difficult when the scraper remains attached since it has to
be removed and inserted through the inside diameter area of the scraper.
！
Warning
・Only people who have sufficient knowledge and experience are allowed
to replace seals.
The person who disassembles and reassembles the cylinder is responsible for the safety of
the product.
！
Caution
・When replacing seals, carefully handle parts to prevent injury to your
hands or fingers on the corners of parts.
3-2-1. Disassembly / Reassembly
！
Caution
・Disassemble and assemble the cylinder on a clean cloth in a clean
location. Perform on a clean cloth.
For disassembling, hold the flats of the tube cover gently in a vice and hold the flats of the rod
cover with a spanner or adjustable wrench to loosen and remove the rod cover. When
reassembling, tighten 0 to 2 degrees more than the original position before disassembling.
Bore size of ø50 or more cannot be disassembled because they are tightened to a high torque.
Contact your SMC Sales representative if you need to disassemble these products.
Sealant∗is used on the threads of the connecting sections of the cover
and the cylinder tube for airtight construction. When disassembling the
cylinder, the old sealant must be completely removed, and new sealant
must be applied before re-assembling.
∗Loctite® 542 ( medium strength ) or equivalent

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18
－
3-2-2. Removal of seals
1. Rod seal
Insert a precision screwdriver from the front of the rod cover to pull out the seal as
shown in Fig. 4.
！
Caution
1)Take care not to damage the seal groove of the cover at this time.
2) When the water-resistant scraper is worn out, replace the entire rod cover
assembly.
In such a case, contact your SMC sales representative.
(Only available for cylinders up to Ø40)
2. Piston seal
Wipe off grease around piston seal first to make seal removal easier.
As shown in Fig. 5, hold the piston seal with one hand and push it into the groove
so that the piston seal can be lifted off and pulled out without using a precision
screwdriver.
The groove of the rod cover is deep, so if the rod seal is removed with a precision
screwdriver, it might be damaged.
Fig. 4 How to remove rod seal
Fig. 5 How to remove piston seal
3.Valve seal and Valve retaining gasket ( Only for air cushion type ）
Pry it with a miniature driver after disassembly.（Fig. 6）
Fig. 6 Positions of Valve seal and Valve retaining gasket
Be careful not
to make
Pinch and pull out.
Valve retaining gasket
Valve seal

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19
－
3-2-3. Grease
！
Caution
・Use SMC’s recommended grease.
Grease pack part number: GR-R-010 ( 10g )
1. Rod seal
Apply a thin layer of grease to all surfaces of the new seal to make it easy to
mount the rod seal and improve sealing.
Fill the groove of the seal with grease, which is necessary for operation.
2. Piston seal
Apply a thin layer of grease to the all surfaces of the piston seal to make it easy to
mount the seal.
3. Valve seal and Valve retaining gasket ( Air cushion type ）
Lightly apply grease to the entire surface.
4. Parts of cylinder
Grease is applied to the locations shown in Fig. 4. The amount of grease per
cylinder of 100 stroke is shown in attached table 4. Roughly, one scoop with a
forefinger is approximately 3g.
ℓ≒100mm, or stroke ×
1
2
Fig. 7 Position for application of grease
Table 4 Amount of grease units: g
Bore size
(mm)
Stroke
20 25 32 40 Position for grease
At 100st 2 3 3 3 to 4 1，2，3，4，5，6，7，8
50st added 0.5 0.5 0.5 1 3，4
5，6 and 7 are not applicable for Rubber bumper type
Amount of grease
Grease in the groove
Grease on the outer circumference
Rod seal part
Approx. 3g
A little less
than 1cm