SMC Networks MHS2 User manual

Doc.No.MH*-OMC0004
PRODUCT NAME
3 finger Air Gripper
MODEL / Series / Product Number
MHS2
MHS3
MHSJ3
MHSH3
MHSHJ3
MHS4

2
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.

3
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 followed.
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.
! 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.

4
Contents
Safety instructions
1. Product specifications..............................................................................................................5
1-1. Specifications.......................................................................................................................5
2．Usage and Handling................................................................................................................7
2-1. Precautions on Design .........................................................................................................7
2-2. Selection ..............................................................................................................................7
2-3.Mounting ...............................................................................................................................8
2-4. Air supply ...........................................................................................................................14
2-5.Piping..................................................................................................................................15
2-6. Operating environment.......................................................................................................15
2-7. Lubrication..........................................................................................................................15
3. Maintenance ............................................................................................................................15
3-1. Precautions ........................................................................................................................15
3-2.Exploded view.....................................................................................................................16

5
1. Product specifications
1-1. Specifications
MHS2 Series
Model
MHS2-16D
MHS2-20D
MHS2-25D
MHS2-32D
MHS2-40D
MHS2-50D
MHS2-63D
Cylinder bore size mm
16
20
25
32
40
50
63
Fluid
Air
Operating pressure MPa
0.2 to 0.6
1.0 to 6.0
Ambient and fluid temperature deg. C
-10 to 60
Repeatability mm
+/- 0.01
Maximum operating frequency c.p.m.
120
60
Lubrication
Not required
Action
Double acting
Effective gripping
force 1) N
External gripping force
21
37
63
111
177
280
502
Internal gripping force
23
42
71
123
195
306
537
Opening/Closing stroke(diameter) mm
4
4
6
8
8
12
16
Mass g
58
96
134
265
345
515
952
1) Values for 16 to 25 are with gripping point L=20mm, for 32 to 63 with gripping point L=30mm.
Supply air pressure is 0.5 MPa.
MHS3 Series
Model
MHS3-16D
MHS3-20D
MHS3-25D
MHS3-32D
MHS3-40D
MHS3-50D
MHS3-63D
MHS3-80D
MHS3-100D
MHS3-125D
Cylinder bore size mm
16
20
25
32
40
50
63
80
100
125
Fluid
Air
Operating pressure MPa
0.2 to 0.6 {2.0 to 6.1}
1.0 to 6.0 {1.0 to 6.1}
Ambient and fluid
temperature deg.C
-10 to 60
Repeatability mm
+/- 0.01
Maximum operating
frequency c.p.m.
120
60
30
Lubrication
Not required
Action
Double acting
Effective gripping
force 1) N
External
gripping force
14
25
42
74
118
187
335
500
750
1,270
Internal
gripping force
16
28
47
82
130
204
359
525
780
1,320
Opening/Closing stroke
(diameter) mm
4
4
6
8
8
12
16
20
24
32
Mass g
60
100
140
237
351
541
992
1,850
3,340
6,460
1) Values for 16 to 25 are with gripping point L=20mm, for 32 to 63 with gripping point L=30mm and for 80 to 125 with gripping point L=50mm.
Supply air pressure is 0.5 MPa.
1)Values for 16 to 25 are with gripping point L=20mm,for 32 to 63 with gripping point L=30mm.
Supply air pressure is 0.5 MPa.
MHS4 Series
Model
MHS4-16D
MHS4-20D
MHS4-25D
MHS4-32D
MHS4-40D
MHS4-50D
MHS4-63D
Cylinder bore size mm
16
20
25
32
40
50
63
Fluid
Air
Operating pressure MPa
0.2 to 0.6
1.0 to 6.0
Ambient and fluid temperature deg. C
-10 to 60
Repeatability mm
+/- 0.01
Maximum operating frequency c.p.m.
120
60
Lubrication
Not required
Action
Double acting
Effective gripping
force 1) N
External gripping force
10
19
31
55
88
140
251
Internal gripping force
12
21
35
61
97
153
268
Opening/Closing stroke(diameter) mm
4
4
6
8
8
12
16
Mass g
66
110
154
300
390
590
1,095

6
MHSJ3 Series
Model
MHSJ3-16D
MHSJ3-20D
MHSJ3-25D
MHSJ3-32D
MHSJ3-40D
MHSJ3-50D
MHSJ3-63D
MHSJ3-80D
Cylinder bore size mm
16
20
25
32
40
50
63
80
Fluid
Air
Operating pressure MPa
0.2 to 0.6
0.1 to 0.6
Ambient and fluid temperature deg. C
-10 to 60
Repeatability mm
+/- 0.01
Maximum operating frequency c.p.m
120
60
30
Lubrication
Not required
Action
Double acting
Effective gripping
force 1 N
External gripping force
9
21
36
62
97
155
280
400
Internal gripping force
16
28
47
82
130
204
359
525
Opening/Closing stroke(diameter) mm
4
4
6
8
8
12
16
20
Mass g
95
150
230
440
620
1,050
1,800
3,200
1) Values for 16 to 25 are with gripping point L=20mm,for 32 to 63 with gripping point L=30mm.and for to 80 with gripping point L=50mm.
Supply air pressure is 0.5 MPa.
MHSH3 Series
Model
MHSH3-16D
MHSH3-20D
MHSH3-25D
MHSH3-32D
MHSH3-40D
MHSH3-50D
MHSH3-63D
MHSH3-80D
Cylinder bore size mm
16
20
25
32
40
50
63
80
Fluid
Air
Operating pressure MPa
0.2 to 0.6
0.1 to 0.6
Ambient and fluid temperature deg. C
-10 to 60
Repeatability mm
+/- 0.01
Maximum operating frequency c. p. m.
120
60
30
Lubrication
Not required
Action
Double acting
Effective gripping
force 1) N
External gripping force
9
21
36
62
97
155
280
400
Internal gripping force
15
26
45
77
118
187
329
490
Through hole bore mm
3H10
3H10
4H10
6H10
10H10
12H10
16H10
20H10
Opening/Closing stroke(diameter) mm
4
4
6
8
8
12
16
20
Mass g
90
140
220
410
570
970
1,650
2,920
1)Values for 16 to 25 are with gripping point L=20mm, for 32 to 63 with gripping point L=30mm, and for to 80 with gripping point L=50mm.
Supply air pressure is 0.5 MPa.
MHSH3 Series(Center pusher type／Cylinder type)
Model
MHSH3-32DA
MHSH3-40DA
MHSH3-50DA
MHSH3-63DA
MHSH3-80DA
Pusher cylinder bore size mm
12
20
25
32
40
Fluid
Air
Operating pressure MPa
0.2 to 0.6
0.1 to 0.6
Ambient and fluid temperature deg. C
-10 to 60
Maximum operating frequency c. p. m.
60
30
Lubrication
Not required
Action
Double acting
Pusher stroke mm
5
5
10
10
15
Pusher thrust N 1)
Extention
45
130
204
335
524
Mass g
530
770
1,330
2,300
4,000
1)Supply air pressure is 0.5 MPa.
MHSH3 Series(Center pusher type／Spring type)
Model
MHSH3-32DB
MHSH3-40DB
MHSH3-50DB
MHSH3-63DB
MHSH3-80DB
Pusher stroke mm
5
5
10
10
15
Pusher spring force N
6 to 10
11 to 15
20 to 25
29 to 34
49 to 59
Mass g
500
740
1,290
2,250
4,000
MHSH3 Series(With Dust cover)Mass g
Model
MHSH3-32
MHSH3-40
MHSH3-50
MHSH3-63
MHSH3-80
With Dust cover(through hole)
430
600
1,020
1,710
3,040
With Dust cover(center pusher/cylinder type)
550
800
1,380
2,360
4,120
With Dust cover(center pusher/spring type)
520
770
1,340
2,310
4,120

7
2．Usage and Handling
2-1. Precautions on Design
! Warning
1．Provide a protective cover to minimize the risk of personal injury due to accidental
contact with moving parts of the gripper or with moving work pieces．
2．Take measures to prevent an unexpected dropping of work pieces due to a loss of
air pressure caused by service interruption or air supply failure.
3．Contact SMC when this product is used for applications other than carrying of
works, such as positioning and clamping.
2-2. Selection
! Warning
1．Keep the gripping point within the limits of the specified gripping range.
With gripping a point out of the range, excessive moment load may act on the sliding part of
fingers, which may shorten life span of the product. Refer to Its catalog for further details.
2．Design attachments to be the lightest and shortest possible．
①Long and heavy attachments increase the inertial force when opening and closing fingers. This
may cause unsteady movement of the fingers and have an adverse effect on life span of the
product．
②Even with the gripping point within the limits of the range，make the attachments as light and
short as possible．Refer to catalog for details.
③ Select a larger size gripper or use multiple grippers for handling long and large work pieces.
3. Provide run off space in the attachments when handling small or thin work pieces.
If run off space is not provided, gripping becomes unstable, and it may fail to grip or the position
may slip, etc.
Good : ”L” are appropriate
Not Good : ”L” is too long
Runoff space
Needle shaped workpiece
Runoff space
Thin sheet workpiece

8
4. Select model which has sufficient gripping force for the work piece weight.
Incorrect selection may lead to dropping of work pieces, etc. Refer to the catalog for effective
gripping force of each series and work piece weight.
5. Avoid applications where excessive external force or Impact acts.
Such applications may cause failure. Consult SMC If necessary.
6. Select a model having a sufficient finger opening width for a work piece.
<In case of insufficient width>
①Gripping becomes unstable due to variation in opening width or work piece diameter.
②Detection failure occurs when using an auto-switch. by referring to the information onauto-switch
hysteresis of each series, secure a sufficient stroke for hysteresis. When Water Resistance
Improved Two Color Auto-Switch is used, stroke may be limited depending on the lamp colors
setting at detecting.
2-3.Mounting
! Warning
1. Do not drop or dent the gripper when mounting it.
Even a slight deformation will cause Inaccuracy or malfunction.
2. Tighten screw within the specified torque range when mounting attachments.
Tightening with a higher torque than specified one may cause malfunction,
while tightening with a lower torque may allow slipping of the gripping position
or dropping of woke pieces.
Mounting of Attachments on Fingers
Use tightening torque In the table below and mount attachments by Inserting bolts
In female mounting thread of fingers.
3. Tighten Air Gripper with a proper torque within the specified range.
Tightening with a higher torque than the specified one may cause malfunction,
while tightening with a lower torque may allow slipping of the gripping position or
dropping of work pieces. Refer to pages 9 to 11 for tightening torque.
Cylinder bore
Bolt
Max. tightening torque
N･m
Max. screw-In
depth mm
16
20
25
M3×0.5
0.59
5
6
6
32
40
M4×0.7
1.4
8
8
50
63
M5×0.8
2.8
10
10
80
M6×1
4.8
12
100
M8×1.25
12
16
125
M10×1.5
24
20

9
Mounting of Push Plate to Push Rod
Use tightening torque in the table below and mount attachments by inserting bolts in female
mounting thread of fingers．
Model
Bolt
Max. tightening torque
(N･m)
Max. screw-in
depth (mm)
MHSH(J)3-32DA
MHSH(J)3-32DB
M3×0.5
0.6
6
MHSH(J)3-40DA
MHSH(J)3-40DB
M5×0.8
2.8
10
MHSH(J)3-50DA
MHSH(J)3-50DB
M6×1
4.8
12
MHSH(J)3-63DA
MHSH(J)3-63DB
M8×1.25
12
16
MHSH(J)3-80DA
MHSH(J)3-80DB
M10×1.5
24
20
Attaching and Removing of Dust Covers（A）＆（J）
＜Removing＞
①Remove the return of the dust cover from the circumference of the guide．
②After the return is removed from the circumference of the guide，pull the cover to the direction of
the arrows while holding the ■ section and remove it from the slots of the fingers．
③When the dust cover is removed from the slots of the fingers，pull it to the direction of the arrows
and remove it from the product．
＜Attaching＞
①Reversing the removing procedure． Lnstall the dust cover in the slots of the fingers．
②Lnstall the return of the cover to the circumference of the guids.
Note）Care should be taken not to tear the dust cover when installing or removing it．
Female screws for
push plate mounting
Dust cover
Finger
Remove
Remove
Recessed part
Dust cover cross-sectional view
Rear
Finger

10
Tapped hoes
Mounting of Air gripper
MHS2 Series
Model
Screw
Max. tightening
torque (N･m)
Maximum screw-
in depth
(L mm)
MHS2-16D
M4×0.7
2.1
8
-20D
M4×0.7
2.1
8
-25D
M4×0.7
2.1
8
-32D
M5×0.8
4.3
10
-40D
M6×1
7.3
12
-50D
M6×1
7.3
12
-63D
M6×1
7.3
12
MHS3 Series
Model
Screw
Max.
tightening
torque (N･m)
Maximum
screw-in depth
(L mm)
MHS3-16D
M3×0.5
0.66
4.5
20D
M3×0.5
0.88
6
25D
M4x0.7
1.6
6
32D
M4×0.7
1.6
6
40D
M5×0.8
3.2
7.5
50D
M5×0.8
4.3
10
63D
M6×1
5.4
9
80D
M6×1
7.3
12
100D
M8×1.25
18
16
125D
M10×1.5
36
20
MHS4 Series
Model
Screw
Max.
tightening
torque (N･m)
Maximum
screw-in depth
(L mm)
MHS4-16D
M4×0.7
2.1
8
-20D
M4×0.7
2.1
8
-25D
M4×0.7
2.1
8
-32D
M5×0.8
4.3
10
-40D
M6×1
7.3
12
-50D
M6×1
7.3
12
63D
M6×1
7.3
12
Use the hole at the body
end face for positioning

11
Axial mounting (Body tapped) MHSJ3,MHSH3 Series
Model
Screw
Max.
tightening
torque (N･m)
Maximum
screw-in
depth
(L mm)
MHSJ3-16D
MHSH3-16D
M4×0.7
2.1
8
MHSJ3-20D
MHSH3-20D
M4×0.7
2.1
8
MHSJ3-25D
MHSH3-25D
M4×0.7
2.1
8
MHSJ3-32D
MHSH3-32D
M4×0.7
2.1
8
M5×0.8
3.2
10
MHSJ3-40D
MHSH3-40D
M4×0.7
2.1
8
M5×0.8
3.2
10
MHSJ3-50D
MHSH3-50D
M5×0.8
3.2
10
M6×1
7.3
12
MHSJ3-63D
MHSH3-63D
M6×1
7.3
12
M8×1.25
18
16
MHSJ3-80D
MHSH3-80D
M6×1
7.3
12
M8×1.25
18
16
MHSH3 Series (Center pusher)
Model
Screw
Max.
tightening
torque (N･m)
Maximum
screw-in
depth
(L mm)
MHSH3-32DA
MHSH3-32DB
M5×0.8
3.2
10
MHSH3-40DA
MHSH3-40DB
M5×0.8
3.2
10
MHSH3-50DA
MHSH3-50DB
M6×1
7.3
12
MHSH3-63DA
MHSH3-63DB
M8×1.25
18
16
MHSH3-80DA
MHSH3-80DB
M8×1.25
18
16

12
Horizontal mounting (Body tapped)
MHS2 Series
Model
Screw
Max. tightening
torque (N･m)
MHS2-16D
M3×0.5
0.88
20D
M3×0.5
0.88
25D
M3×0.5
0.88
32D
M4×0.7
2.1
40D
M5×0.8
4.3
50D
M5×0.8
4.3
63D
M5×0.8
4.3
MHS3 Series
Model
Screw
Max. tightening
torque (N･m)
MHS3-16D
M3×0.5
0.88
20D
M3×0.5
0.88
25D
M4×0.7
2.1
32D
M4×0.7
2.1
40D
M5×0.8
4.3
50D
M5×0.8
4.3
63D
M6×1
7.3
80D
M6×1
7.3
100D
M8×1.25
18
125D
M10×1.5
36
MHS4 Series
Model
Screw
Max. tightening
torque (N･m)
MHS4-16D
M3×0.5
0.88
-20D
M3×0.5
0.88
-25D
M3×0.5
0.88
-32D
M4×0.7
2.1
-40D
M5×0.8
4.3
-50D
M5×0.8
4.3
-63D
M5×0.8
4.3
MHSJ3,MHSH3 Series（Senter pusher）
Model
Screw
Max.
tightening
torque (N･m)
MHSH3-16DA
MHSH3-16DB
M3x0.5
0.88
MHSH3-20DA
MHSH3-20DB
M3x0.5
0.88
MHSH3-25DA
NHSH3-25DB
M3x0.5
0.88
MHSH3-32DA
MHSH3-32DB
M4×0.7
2.1
MHSH3-40DA
MHSH3-40DB
M4×0.7
2.1
MHSH3-50DA
MHSH3-50DB
M5×0.8
4.3
MHSH3-63DA
MHSH3-63DB
M6×1
7.3
MHSH3-80DA
MHSH3-80DB
M6×1
7.3
MHSH3 Series（Center pusher）
Model
Screw
Max.
tightening
torque (N･m)
MHSH3-32DA
MHSH3-32DB
M4×0.7
2.1
MHSH3-40DA
MHSH3-40DB
M4×0.7
2.1
MHSH3-50DA
MHSH3-50DB
M5×0.8
4.3
MHSH3-63DA
MHSH3-63DB
M6×1
7.3
MHSH3-80DA
MHSH3-80DB
M6×1
7.3
Note) When mounting the MHSJ3 or MHSHJ3 using its body
through hole, remove the dust cover from the product first.
When the product is secured with the corresponding bolt, then
reattach the dust cover.

13
Caution
1. Avoid twisting the gripper when mounting an attachment.
Any damage to the gripper may cause malfunction and reduce the accuracy.
2. Avoid external force to fingers.
Fingers may be damaged by a continual lateral or impact load.
Provide clearance to prevent the workpiece or the attachment from striking against any object at
the stroke end.
1.Stroke end when fingers are opened
2. Stroke end when gripper is moving
3.When turning over
Clearance
Clearance
〇 With Clearance
✕ Without Clearance
Impact load
Clearance
Clearance
Impact load
Impact load
Clearance
Inversion
〇 With Clearance
✕ Without Clearance

14
3. Adjust the gripping point so that an excessive force will not be applied to the fingers when
inserting a workpiece.
Confirm that the gripper can operate without receiving any shock by testing it in manual
operation mode or by low speed operation.
4. Use a speed controller to adjust the opening/closing speed of the fingers and the
ejection/retraction speed of the push rod so that they do not exceed the necessary speed.
If the opening/closing speed of the fingers and the push rod extrusion/retraction speed are faster
than necessary, the impact force acting on the fingers and other parts will increase, resulting in
poor repeatability in workpiece gripping and adversely affecting the life of the workpiece.
2-4. Air supply
Warning
1. Please consult with SMC when using the product in applications other than compressed air.
2. Compressed air containing a large amount of condensate can cause malfunction of pneumatic
equipment. An air dryer or water droplet separator should be installed upstream from filters.
3. If condensate in the drain bowl is not emptied on a regular basis, the condensate will overflow
and allow it to enter the compressed air lines. This will cause a malfunction of pneumatic
equipment. If the drain bowl is difficult to check and remove, installation of a drain bowl with an
auto drain option is recommended.
4. Use clean air.
Do not use compressed air that contains chemicals, synthetic oils including organic solvents,
salt or corrosive gases, etc., as it can cause damage or malfunction.
For detailed information regarding the quality of the compressed air described above, refer to
SMC's "Air Cleaning Systems".
Caution
1. When extremely dry air is used as the fluid, degradation of the lubrication properties inside the
equipment may occur, resulting in reduced reliability (or reduced service life) of the equipment.
Please consult with SMC.
2. Install an air filter.
Install an air filter upstream near the valve. A filtration degree of 5μm or less should be
selected.
3. Install an aftercooler, air dryer or drain catch before the filter and take appropriate measures.
Compressed air that contains excessive foreign material may cause malfunction of valves and
other pneumatic equipment.
Install an aftercooler, air dryer or drain catch before the filter and take appropriate measures.
4. Use the product within the specified fluid and ambient temperature range.
When operating at temperatures 5oC or lower, water in the circuit may freeze and cause
breakage of seals or malfunction. Measures should be taken to prevent freezing.
For detailed information regarding the quality of the compressed air described above, refer to
SMC's "Air Cleaning Systems".
Good : With clearance
Not Good : No clearance

15
2-5.Piping
Caution
1. Refer to the Fittings and Tubing Precautions (Best Pneumatics) for handling one touch fittings.
2. Before piping
Before piping is connected, flush thoroughly with air or wash to remove chips, cutting oil and
other debris from inside the pipe.
2-6. Operating environment
Warning
1. Do not use in an environment where corrosive gases, chemicals, sea water, water or steam are
present.
Refer to the construction drawings regarding the air chuck materials.
2. Do not use in direct sunlight.
3. Do not operate in a location subject to vibration or impact.
4. Do not mount the product in locations where it is exposed to radiant heat.
5. Do not use this product in an area that is dusty, or in an environment in which water or oil
splashes on the cylinder.
2-7. Lubrication
Caution
1. The non-lube type air gripper is lubricated at the factory, and can be used without any further
lubrication.
If a lubricant is used in the system, use turbine oil Class 1 (with no additive) ISO VG32.
Furthermore, once lubrication is applied, it must be continued.
If lubrication is later stopped, malfunction can occur due to loss of the original lubricant.
Refer to the Material Safety Data Sheet (MSDS) of the hydraulic fluid when supplying the fluid.
3. Maintenance
3-1. Precautions
Warning
1. Maintenance should be performed according to the procedure indicated in the Operation
Manual.
If handled improperly, malfunction and damage of machinery of equipment may occur.
2. 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. Remove drainage moisture from air filters regularly.
4. When components are removed, first confirm that measures are in place to prevent any
workpieces from dropping, run-away of equipment, etc. Then cut off the supply pressure and
electric power, and exhaust all compressed air from the system using the residual pressure
release function.
Turn off the power supply, stop the air supply and exhaust all compressed air from the system.
5. Do not allow people to enter or place objects in the carrying path of the air gripper.
This can cause an injury or accident.
6. Do not put hands, etc. in between the air gripper fingers or attachments.
This can cause an injury or accident.
7. When removing the air gripper, first confirm that no workpieces are being held and then release
the compressed air before removing the air gripper.
If a workpiece is still being held, there is a danger of it being dropped.

16
3-2.Exploded view
MHS2
MHS3
MHS4
For MHS2 and MHS4, there are no major structural differences; refer to MHS3 for disassembly.
Type C retaining ring
Cap
Piston assembly
(With packing and magnet)
O-ring for piston bolt
O-ring for cap
Piston bolt
Piston packing
Rod packing
Body
Finger
Cam
End plate
cross recessed
countersunk head screw

17
MHSHJ3
Cap (J)
Piston
Piston packing
Rubber magnet
Body
Finger
Cam (J)
Tube
End plate (J)
Dust cover (J)
Type C retaining ring
Positioning
pin
cross recessed
countersunk head screw
Fixing procedure for body
and guide;
Please use the parallel pin
insertion holes on the body
and guide.
O-ring for cap
O-ring for cap
O-ring for
piston
Packing for cam

18
MHSJ3
Cap (A)
Piston
Body
Positioning pin
Finger
Cam (A)
End plate (A)
Type C retaining ring
Rubber magnet
Piston packing
cross recessed
countersunk head screw
Fixing procedure for body
and guide;
Please use the parallel pin
insertion holes on the body
and guide.
O-ring for cap
O-ring for piston

19
Center pusher／Cylinder type Center pusher／Spling type
Push holder (P)
Damper
Piston(P)
Damper
Rod holder
O-ring for
Rod holder
Rod packing
O-ring for
push rod
Push rod(P)
Type C retaining ring
Type C retaining ring
Cap (S)
Spring
Hexagon socket
Head cap screw
Push rod (S)
Push holder (S)
When disassembling the center
pusher/spring type; the cap and
spring may pop out when removing
the C-type retaining ring.
Spring holder
O-ring for
piston
Magnet

20
3-3. Replacement Procedure
MHS3
1). Remove the C-shaped retaining ring
with the prescribed tool and remove the cap.
2). Remove the piston bolt.
Screw
width
across
flats
Max. tightening
torque (N･m)
φ16
M3x0.5
2.5
0.6
φ20
M3x0.5
2.5
0.6
φ25
M4x0.7
3
1.4
φ32
M5x0.8
4
5.1
φ40
M5x0.8
4
5.1
φ50
M6x1
5
8.6
φ63
M8x1.25
6
21.6
φ80
M10x1.5
8
24
φ100
M12x1.75
10
42.2
φ125
M14x2
12
67.7
Type C retaining
ring
Cap
Piston bolt
hexagonal wrench
Piston
Packing
5). Open the fingers and remove the cam.
4). Loosen cross recessed countersunk
head screw and take out end plate.
3). Remove the piston and replace the packing.
Cam
Finger
End plate
Cross recessed
countersunk head screw