SMC Networks CNS Series User manual

How to Order
Nil
N
R
H
Tubing material
Aluminum tube
Steel tube
Mounting style
Built-in magnet
B
L
F
G
C
D
T
Basic style
Foot style
Rod side flange style
Head side flange style
Single clevis style
Double clevis style
Center trunnion style
CNS D
L
L
125
125
100
100
CDNS D
Cylinder stroke (mm)
Refer to “Maximum Stroke”
With cushion in both ends
Without cushion
With rod bumper
With head bumper
Cushion
Bore size
125
140
160
125 mm
140 mm
160 mm
Locking
direction
DBoth directions
Built-in Magnet Cylinder Model
Nil
F∗
With auto switch
Cylinder with Lock
Double Acting, Single Rod
Series CNS
ø125, ø140, ø160
Without
auto switch
∗ Auto switches are not
available with steel
tube.
In the case of built-in magnet without auto
switch, the symbol for auto switch is “Nil”.
(Example) CDNSL140-100
With rod boot/cushion
∗ In the case of one side, it is in the lock side.
∗∗
When the symbols are two or more, indicate
them alphabetically.
- X1166
- X1166
G Porting

Holding Force of Spring Locking (Maximum static load)
Type
Non-lube
Action
Double
acting
Lock operation
Spring locking
Bore size (mm)
125, 140, 160
Model
Type
Fluid
Proof pressure
Max. operating pressure
Min. operating pressure
Piston speed
Cushion
Stroke length tolerance
Mounting
Cylinder Specifications
Non-lube
Air
1.46 MPa
0.97 MPa
0.08 MPa
50 to 500 mm/s ∗
Yes
Without auto switch: 0 to 70°C (No freezing)
With auto switch: 0 to 60°C (No freezing)
Basic style, Axial foot style, Rod side flange style,
Center trunnion style, Single clevis style, Double clevis style,
Center trunnion style
Ambient and
fluid temperature
Locking action
Unlocking pressure
Lock starting pressure
Operating pressure range
Locking direction
Lock Specifications
Spring locking (Exhaust lock)
0.25 MPa or more
0.20 MPa or less
0.25 to 0.7 MPa
Both directions
Bore size
(mm)
125, 140
160
Maximum Stroke/( ): Denotes for steel tube.
Maximum stroke
Up to 1000 (Up to 1000)
Up to 1200 (Up to 1200)
Lock type
Spring locking
Stopping Accuracy
Piston speed (mm/s)
100
±0.5
300
±1.0
500
±2.0
Bore size (mm)
Holding force (KN) 8.4
125
10.5
140
13.8
160
CNS쏔
CDNS쏔
Up to 1400 (Up to 1600)
Up to 1400 (Up to 1600)
Basic style, Head side flange style, Single clevis style,
Double clevis style, Center trunnion style
Foot style, Rod side flange style
∗Auto switches are not available with iron tube.
∗Be sure to make cylinder selections in accordance with the method given on page 9-8-6.
Series
Up to 250: , 251 to 1000: ,1001 to 1500: , 1501 to 1600:
+1.0
0+1.4
0+1.8
0+2.2
0
∗ Load limits exist depending upon piston speed when locked, mounting direction and operating
pressure.
Condition: Lateral, Supply pressure P = 0.5 MPa
Load weight ······ Upper limit of allowed value
Solenoid valve for locking ···· Mounted directly to unlocking port
Maximum value of stopping position dispersion from 100 measurements
Series CNS
Cylinder with Lock
Double Acting, Single Rod
Symbol

Mounting Bracket Part No.
Bore size (mm)
Foot (1)
Flange (2)
Single clevis
Double clevis (3)
CS1-F12
CS1-C12
CS1-D12
CS1-F14
CS1-C14
CS1-D14
CS1-F16
CS1-C16
CS1-D16
Accessory
Mounting bracket
—
Standard equipment
Option
Clevis pin
Rod end nut
Single knuckle joint
Double knuckle joint (With pin)
With rod boot
—————
Basic style Foot style
Rod side style
Flange side style
(kg)
Bore size (mm)
Basic style
Foot style
Flange style
Single clevis style
Single knuckle joint
Double knuckle joint (With pin)
Rod end nut
125
Construction Principle
Basic weight············ 40.19 (Foot style, ø140)
Additional weight ···· 1.96/100 stroke
Cylinder stroke ······· 100 stroke
40.19 + 1.96 x 100/100 = 42.15 kg
Spring locking (Exhaust lock)
The spring force which acts upon the taper ring is
magnified by a wedge effect, and is conveyed to all
of the numerous steel balls which are arranged in
two circles. These act on the brake shoe holder and
brake, which locks the piston rod by tightening
against it with a large force.
Unlocking is accomplished when air pressure is
supplied to the unlocking port. The release piston
and taper ring oppose the spring force, moving to
the right side, and the ball retainer strikes the cover
section A. The braking force is released as the steel
balls are removed from the taper ring by the ball
retainer.
Locked state Unlocked state
140 160
14.40
28.79
(30.26)
30.42
(31.89)
31.47
(32.94)
31.86
(33.33)
32.32
(33.79)
32.92
(34.39)
1.77
(2.66)
0.91
1.37
0.16
20.20
37.67
(39.48)
40.19
(42.00)
42.67
(44.48)
41.96
(43.77)
42.71
(44.52)
43.40
(45.21)
1.96
(3.01)
1.16
1.81
0.16
30.60
55.31
(57.52)
58.11
(60.32)
61.70
(63.91)
60.80
(63.01)
61.65
(63.86)
62.71
(64.92)
2.39
(3.58)
1.56
2.48
0.23
Lock unit weight
Trunnion style
Double clevis style
(Including clevis pin
and cotter pin)
Brake shoe holder
Brake shoe
Release piston
Air pressure exhaust
Air pressure supply
Steel ball
Ball retainer
Taper ring
Brake spring
Calculation: (Example) CNSL140-100
Note 1) When ordering foot bracket, order 2 pieces per cylinder.
Note 2) ø125 to ø160 rod side flange styles use Series CS1 long stroke
flanges.
Note 3) Clevis pin, plain washer, and cotter pin are shipped together with
double clevis style.
Head side
flange style
Double clevis
style
Center trunnion
style
Single clevis
style
Additional weight per each
100 mm of stroke
Basic
weight
Accessory
bracket
Series CNS
Weight/( ): Denotes the values for steel tube.
125 140 160
CS1-L12 CS1-L14 CS1-L16

Basic style (B): CNSB
Dimensions
Bore size
(mm)
Stroke range
(mm)
125
140
160
Up to 1000
Up to 1000
Up to 1200
Bore size
(mm)
125
140
160
CL
T
MM
M GA
GG
FA GB
AL
A K F
VA
BN
S+ Stroke
ZZ + Stroke
NN
M
H
GL
GR
C
B
Q
øE
øD
øEA
V
Unlocking port Cylinder port
Rc BQ plug with breathing hole
BC element
2-MA
Thread effective depthR
4-J
Width across flats KA
A
50
50
56
AL
47
47
53
B
145
161
182
BN
205
245
290
BP
G1/2
G1/2
G1/2
BQ
3/8
3/8
3/8
C
115
128
144
CL
120
136
144
D
36
36
40
E
90
90
90
EA
63
63
63
F
35
35
43
FA
14
14
14
G GA
155
180
215
GB
23
28
35
GL
25
30
35
GR
30
30
35
J
M14 x 1.5
M14 x 1.5
M16 x 1.5
K
15
15
17
KA
31
31
36
M MA
M12 x 1.75
M12 x 1.75
M12 x 1.75
MM
M30 x 1.5
M30 x 1.5
M36 x 1.5
N
35
35
39
P
1/2
1/2
3/4
Q R
25
25
25
S
303
343
396
T V
20
20
25
VA
23
28
35
H
110
110
120
ZZ
16
16
18.5
440
480
546.5
87.5
95
109
27
27
30.5
85.5
93.5
104
Series CNS
G BP 2-G P

2-MA
Thread effective depthR
Foot style (L): CNSL
Bore size
(mm)
Stroke range
(mm)
125
140
160
Up to 1400
Up to 1400
Up to 1400
Bore size
(mm)
125
140
160
A
50
50
56
AL
47
47
53
B
145
161
182
BN
205
245
290
BP
G1/2
G1/2
G1/2
BQ
3/8
3/8
3/8
C
115
128
144
CL
120
136
144
D
36
36
40
E
90
90
90
EA
63
63
63
F
35
35
43
FA
14
14
14
G GA
155
180
215
GB
23
28
35
GL
25
30
35
GR
30
30
35
J
M14 x 1.5
M14 x 1.5
M16 x 1.5
K
15
15
17
KA
31
31
36
Bore size
(mm)
Stroke range
(mm)
Long stroke
CL
CL
GR GL
T
T
GLGR
LX
C
B
Q
LY
LH
V
2-MA
Thread effective depthR
4-J
MM
GA
G
G
FA
GB
AL
AKF
VA BN
S+ Stroke
ZZ + Stroke
LS + Stroke
NN
X
XY Y
LT
H
øE
øD
øEA
Rc BP
Unlocking port
2-Rc P
Cylinder port
Rc BQ plug with breathing hole
BC element
Width across flats KA
4-øLD
øE
øD
øEA
LX
C
B
Q
LY
LH
V
4-J
AL
FA
A K
H
MM
GA
FGB Rc BP
Unlocking port
Width across flats KA
LT
VA BN
S+ Stroke
LS + Stroke
ZZ + Stroke
NRT N
X
XYY
4-øLD
G
G
2-Rc P
Cylinder port
Rc BQ plug with breathing hole
BC element
RY
LD
19
19
19
LH
85
100
106
LS
393
433
496
LT
8
9
9
LX
100
112
118
LY MM
M30 x 1.5
M30 x 1.5
M36 x 1.5
MA
M12 x 1.75
M12 x 1.75
M12 x 1.75
N
35
35
39
P
1/2
1/2
3/4
Q R
25
25
25
S
303
343
396
T V
20
20
25
VA
23
28
35
X
45
45
50
Y
20
30
25
H
110
110
120
ZZ
478
528
591
∗Not available with auto switches.
(For NPT port)
16
16
18.5
157.5
180.5
197
85.5
93.5
104
87.5
95
109
Series CNS
Cylinder with Lock
Double Acting, Single Rod
45 204
36 184
160 1401 to 1600
140 1401 to 1600
125 1401 to 1600 36 164
RT RY

Rod side flange style (F): CNSF
Dimensions
Bore size
(mm)
Stroke range
(mm)
125
140
160
Up to 1400
Up to 1400
Up to 1400
Bore size
(mm)
125
140
160
A
50
50
56
GB
23
28
35
Bore size
(mm)
125
140
1401 to 1600
1401 to 1600
Stroke range
(mm) RT
36
36
45
RY
164
184
204
øE
øD
øEA
MM
Width across
flats KA
FA
M
GB
GA
GG
AL
AKFBN NN
M
FT VA
HS+ Stroke
ZZ + Stroke
Rc BP
Unlocking port
2-Rc P
Cylinder port
Rc BQ plug with breathing hole
BC element T
GL GR
C
B
FX
FZ
Q
FY
BF
V
4-J
4-øFD
øE
øD
øEA
MM
Width across flats KA
FA
M
GB
GA
GG
BP
Unlocking port
2- P
Cylinder port
Rc BQ plug with breathing hole
BC element
AL
AKFBN NNRT
M
FT VA
HS+ Stroke
ZZ + Stroke
RY
T
GL GR
C
B
FX
FZ
Q
FY
BF
V
4-J
4-øFD
AL
47
47
53
GL
25
30
35
B
145
161
182
GR
30
30
35
BF
145
160
180
J
M14 x 1.5
M14 x 1.5
M16 x 1.5
BN
205
245
290
BP
G1/2
G1/2
G1/2
K
15
15
17
BQ
3/8
3/8
3/8
KA
31
31
36
C
115
128
144
M
19
19
22
D
36
36
40
MM
M30 x 1.5
M30 x 1.5
M36 x 1.5
E
90
90
90
EA
63
63
63
N
35
35
39
F
35
35
43
P
1/2
1/2
3/4
FA
14
14
14
Q
FD
19
19
19
S
303
343
396
FT
14
20
20
T
FX
190
212
236
V
20
20
25
FY
100
112
118
VA
23
28
35
FZ
230
255
275
H
110
110
120
G
ZZ
432
472
538
GA
155
180
215
∗Not available with auto switches.
Long stroke
16
16
18.5
87.5
95
109
85.5
93.5
104
Series CNS
Long Stroke
160 1401 to 1600

Head side flange style (G): CNSG
2-MA
Thread effective
depth R
T
CL
GL
GR
C
B
FX
FZ
Q
FY
BF
V
4-J
4-øFD
MM
GA
GB
M
GG
FA
AL
AKF
VA
BN
S+ Stroke
ZZ + Stroke
NN
FT
H
øE
øD
øEA
Unlocking port Cylinder port
Rc BQ plug with breathing hole
BC element
Width across flats KA
Bore size
(mm)
Stroke range
(mm)
125
140
160
Up to 1000
Up to 1000
Up to 1200
A
50
50
56
GB
23
28
35
Bore size
(mm)
125
140
160
AL
47
47
53
GL
25
30
35
B
145
161
182
GR
30
30
35
BF
145
160
180
J
M14 x 1.5
M14 x 1.5
M16 x 1.5
MM
M30 x 1.5
M30 x 1.5
M36 x 1.5
MA
M12 x 1.75
M12 x 1.75
M12 x 1.75
BN
205
245
290
BP
G1/2
G1/2
G1/2
K
15
15
17
BQ
3/8
3/8
3/8
KA
31
31
36
C
115
128
144
M
19
19
22
CL
120
136
144
D
36
36
40
E
90
90
90
EA
63
63
63
F
35
35
43
N
35
35
39
FA
14
14
14
P
1/2
1/2
3/4
FD
19
19
19
Q
FT
14
20
20
R
25
25
25
FX
190
212
236
S
303
343
396
FY
100
112
118
T
FZ
230
255
275
V
20
20
25
G
VA
23
28
35
GA
155
180
215
H
110
110
120
ZZ
427
473
536
16
16
18.5
87.5
95
109
85.5
93.5
104
Series CNS
Cylinder with Lock
Double Acting, Single Rod
G BP 2-G P

Single clevis style (C): CNSC
Dimensions
Bore size
(mm)
Stroke range
(mm)
125
140
160
Up to 1000
Up to 1000
Up to 1200
A
50
50
56
Bore size
(mm)
125
140
160
MM
GA
GB
M
GG
FA
AL
AKF
VA
BN
S+ Stroke
ZZ + Stroke
Z+ Stroke
NN U
L
RR
CX
CT
H
øE
øD
øEA
G BP
Unlocking port Cylinder port
Rc BQ plug with breathing hole
BC element
Width across flats KA
CL
T
QV
GR GL
2-MA
Thread effective depth R
C
B4-J
GR
30
30
35
AL
47
47
53
J
M14 x 1.5
M14 x 1.5
M16 x 1.5
B
145
161
182
BN
205
245
290
K
15
15
17
BP
G1/2
G1/2
G1/2
KA
31
31
36
BQ
3/8
3/8
3/8
L
65
75
80
C
115
128
144
M
19
19
22
CDH10
MA
M12 x 1.75
M12 x 1.75
M12 x 1.75
MM
M30 x 1.5
M30 x 1.5
M36 x 1.5
CL
120
136
144
CT
17
17
20
CX
N
35
35
39
P
1/2
1/2
3/4
D
36
36
40
Q
E
90
90
90
R
25
25
25
EA
63
63
63
RR
29
32
36
F
35
35
43
S
303
343
396
FA
14
14
14
T
G
U
35
40
45
GA
155
180
215
V
20
20
25
GB
23
28
35
VA
23
28
35
GL
25
30
35
H
110
110
120
Z
478
528
596
ZZ
507
560
632
+0.084
0
+0.084
0
+0.100
0
–0.1
–0.3
–0.1
–0.3
–0.1
–0.3
øCD hole H10
Shaft d9
25
28
32
32
36
40
16
16
18.5
85.5
93.5
104
87.5
95
109
Series CNS
2-G P

Double clevis style (D): CNSD
MM
GA
GB
M
GG
FA
AL
AKF
VA
BN
S+ Stroke
ZZ + Stroke
Z+ Stroke
NNU
L
RR
CX
CZ
CT
H
øE
øD
øEA
Rc BP
Unlocking port 2-Rc P
Cylinder port
øCD hole H10
Shaft d9
Rc BQ plug with breathing hole
BC element
Width across flats KA
CL
T
Q
V
GR GL
2-MA
Thread effective depthR
C
B4-J
Bore size
(mm)
Stroke range
(mm)
125
140
160
Up to 1000
Up to 1000
Up to 1200
Bore size
(mm)
125
140
160
Bore size
(mm)
125
140
160
A
50
50
56
GL
25
30
35
G GA
155
180
215
GB
23
28
35
AL
47
47
53
GR
30
30
35
B
145
161
182
J
M14 x 1.5
M14 x 1.5
M16 x 1.5
MA
M12 x 1.75
M12 x 1.75
M12 x 1.75
MM
M30 x 1.5
M30 x 1.5
M36 x 1.5
BN
205
245
290
H
110
110
120
BP
G1/2
G1/2
G1/2
K
15
15
17
Z
478
528
596
BQ
3/8
3/8
3/8
KA
31
31
36
ZZ
507
560
632
C
115
128
144
L
65
75
80
CDH10
M
19
19
22
CL
120
136
144
CT
17
17
20
N
35
35
39
P
1/2
1/2
3/4
Q
D
36
36
40
R
25
25
25
E
90
90
90
RR
29
32
36
EA
63
63
63
S
303
343
396
F
35
35
43
T
FA
14
14
14
+0.084
0
+0.084
0
+0.100
0
CX CZ
+0.3
+0.1
0
–0.2
0
–0.2
0
–0.2
+0.3
+0.1
+0.3
+0.1
U
35
40
45
V
20
20
25
VA
23
28
35
(For NPT por t)
25
28
32
32
36
40
64
72
80
87.5
95
109
85.5
93.5
104
16
16
18.5
Series CNS
Cylinder with Lock
Double Acting, Single Rod

Y Type Double Knuckle Joint
Part no.
Y-12
Y-14
Y-16
125
140
160
Applicable bore
size (mm)
E1L1MM NZ RR1U1
M30 x 1.5
M30 x 1.5
M36 x 1.5
46
48
55
100
105
110
27
30
34
42
47
46
Material: Cast iron
∗Pin and snap ring are shipped together with double clevis and double knuckle joint.
Clevis Pin/Knuckle Pin
Part no.
IY-12
IY-14
IY-16
125
140
160
Dd9 L l
79.5
86.5
94.5
Material: Carbon steel
Applicable bore size
(mm)
Applicable
cotter pin
69.5
76.5
84.5
ø4 x 40l
ø4 x 40l
ø4 x 40l
Part no.
NT-12
NT-16
125, 140
160
Applicable bore
size (mm)
dH
M30 x 1.5
M36 x 1.5
18
21
Material: Rolled steel
B
46
55
C
53.1
63.5
D
44
53
RR
1
l
L
55
øDd9
2-ød
NXNDH10
I Type Single Knuckle Joint
Part no.
I-12
I-14
I-16
125
140
160
Applicable bore
size (mm) A2E1MM NX RR1U1
M30 x 1.5
M30 x 1.5
M36 x 1.5
54
54
60
46
48
55
27
30
34
33
39
39
Material: Cast iron
NDH10
Rod End Nut
L1
100
105
110
MM 8
U1
L1
NX
NZ
øNDHole H10
Shaft d9
øE1
RR
1
MM
A2
8
L1
U1
NX
øNDH10
øE1
30°
HB
d
D C
Series CNS
Accessory Bracket Dimensions
+0.084
0
+0.084
0
+0.100
0
25
28
32
+0.084
0
+0.084
0
+0.100
0
25
28
32
–0.1
–0.3
–0.1
–0.3
–0.1
–0.3
32
36
40
+0.3
+0.1
+0.3
+0.1
+0.3
+0.1
–0.1
–0.3
–0.1
–0.3
–0.1
–0.3
32
36
40
–0.080
–0.142
–0.065
–0.117
–0.065
–0.117
25
28
32
25
28
32

H
A
L1
H1
Symbol
Bore
size (mm)
125
140
160
I type single knuckle
I-12
I-14
I-16
Applicable knuckle joint part no.
Y type double knuckle
Y-12
Y-14
Y-16
H1
156.5
161.5
170.5
L1
100
105
110
H
110
110
120
A
50
50
56
Bore size (mm)
125
140
160
H
125
125
140
A
65
65
76
3.5
∗Single knuckle joint and double knuckle joint should be used separately.
(Fasten by screwing completely into the rod end threads.)
∗Extend the dimensions of A and H, when using a single/double knuckle joint
together with a rod end nut.
(For extension of the A and Hdimensions, refer to the table above and specify
the made-to-order product -XAO.)
Single/Double Knuckle Joint Mounting
Series CNS
Accessory Bracket Dimensions
A, H Dimensions When Mounting
a Single/Double Knuckle Joint
together with a Rod End Nut

1. Construct so that the human body will not come into
direct contact with driven objects or the moving
parts of the cylinders with lock.
Devise a safe structure by attaching protective covers that
prevent direct contact with the human body, or in cases where
there is a danger of contact, provide sensors or other devices
to perform an emergency stop, etc., before contact occurs.
2. Use a balance circuit, taking cylinder lurching into
consideration.
In cases such as an intermediate stop, where a lock is
operated at a desired position within the stroke and air
pressure is applied from only one side of the cylinder, the
piston will lurch at high speed when the lock is released. In
such situations, there is a danger of causing human injury by
having hands or feet, etc. caught, and also a danger for
causing damage to the equipment. In order to prevent this
lurching, a balance circuit such as the recommended
pneumatic circuits (page 9-8-3) should be used.
Design of Equipment and Machinery
Warning
1. When in the locked state, do not apply a load
accompanied by an impact shock, strong vibration
or turning force, etc.
Use caution, because an external action such as an impacting
load, strong vibration or turning force, may damage the locking
mechanism or reduce its life.
2. Consider stopping accuracy and the amount of over-
run when an intermediate stop is performed.
Due to the nature of a mechanical lock, there is a momentary
lag with respect to the stop signal, and a time delay occurs
before stopping. The cylinder stroke resulting from this delay is
the overrun amount. The difference between the maximum and
minimum overrun amounts is the stopping accuracy.
•Place a limit switch before the desired stopping position,
at a distance equal to the overrun amount.
•The limit switch must have a detection length (dog
length) of the overrun amount + α.
•SMC’s auto switches have operating ranges from 8 to 14
mm (depending on the switch model).
When the overrun amount exceeds this range, self-
holding of the contact should be performed at the switch
load side.
∗For stopping accuracy, refer to page 9-8-9.
Selection
Warning
3. In order to further improve stopping accuracy, the
time from the stop signal to the operation of the
lock should be shortened as much as possible.
To accomplish this, use a device such as a highly responsive
electric control circuit or solenoid valve driven by direct
current, and place the solenoid valve as close as possible to
the cylinder.
4. Note that the stopping accuracy will be influenced
by changes in piston speed.
When piston speed changes during the course of the cylinder
stroke due to variations in the load or disturbances, etc., the
dispersion of stopping positions will increase. Therefore,
consideration should be given to establishing a standard
speed for the piston just before it reaches the stopping
position.
Moreover, the dispersion of stopping positions will increase
during the cushioned portion of the stroke and during the
accelerating portion of the stroke after the start of operation,
due to the large changes in piston speed.
Selection
Warning
1. Be certain to connect the rod end to the load with
the lock released.
If connected in the locked state, a load greater than the
turning force or holding force, etc. may operate on the piston
rod and cause damage to the lock mechanism. Series CNS is
equipped with an emergency unlocking mechanism, however,
when connecting the rod end to the load this should be done
with the lock released. This can be accomplished by simply
connecting an air line to the unlocking port and supplying air
pressure of 0.25 MPa or more.
2. Do not apply offset loads to the piston rod.
Particular care should be taken to match the load’s center of
gravity with the center of the cylinder shaft. When there is a
large discrepancy, the piston rod may be subjected to uneven
wear or damage due to the inertial moment during locking
stops.
Mounting
Warning
 Load center of gravity and cylinder shaft center are matched.
X Load center of gravity and cylinder shaft center are not matched.
Amount of overrun
Stop signal
Series CNS
Specific Product Precautions 1
Be sure to read before handling.
Note) Can be used if all of the generated moment is absorbed by an
effective guide.

1. Be certain to use an pneumatic circuit which will
apply balancing pressure to both sides of the piston
when in a locked stop.
In order to prevent cylinder lurching after a lock stop, when
restarting or when manually unlocking, a circuit should be used
to which will apply balancing pressure to both sides of the
piston, thereby canceling the force generated by the load in
the direction of piston movement.
2. Use a solenoid valve for unlocking which has a
large effective area, as a rule 50% or more of the
effective area of the cylinder drive solenoid valve.
The larger the effective area is, the shorter the locking time will
be (the overrun amount will be shorter), and stopping accuracy
will be improved.
3. Place the solenoid valve for unlocking close to the
cylinder, and no farther than the cylinder drive
solenoid valve.
The shorter the distance from the cylinder (the shorter the
piping), the shorter the overrun amount will be, and stopping
accuracy will be improved.
4. Allow at least 0.5 seconds from a locked stop
(intermediate stop of the cylinder) until release of
the lock.
When the locked stop time is too short, the piston rod (and
load) may lurch at a speed greater than the control speed of
the speed controller.
5. When restarting, control the switching signal for the
unlocking solenoid valve so that it acts before or at
the same time as the cylinder drive solenoid valve.
If the signal is delayed, the piston rod (and load) may lurch at a
speed greater than the control speed of the speed controller.
6. Basic circuit
1) [Horizontal]
Pneumatic Circuit
Warning
2) [Vertical]
[Load in the direction of rod extension] [Load in the direction of rod retraction]
SOL.C SOL.BSOL.A
W
SOL.C SOL.B SOL.A
W
Forward
Backward
3 port
normally
closed
SOL.A SOL.C SOL.B
Pressure
center
Regulator with
check valve
W
SOL.A
ON
OFF
ON
ON
ON
OFF
ON
ON
SOL.B
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
SOL.C
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
Action
Forward
Locked stop
Unlocked
Forward
Backward
Locked stop
Unlocked
Backward
0.5 s or more
0 to 0.5 s
0.5 s or more
0 to 0.5 s
1. Precautions when using the base unit and when
changing bracket positions, etc.
The lock unit and cylinder rod cover are assembled as shown
in the figure below. For this reason, it cannot be installed as in
the case of common air cylinders, by using the basic style and
screwing the cylinder tie-rods directly to machinery.
Furthermore, when replacing mounting brackets, the unit
holding tie-rods may get loosen. Tighten them once again in
such a case.
Mounting
Caution
1. Adjust the cylinder’s air balance. Balance the load by adjusting
the air pressure in the rod and head sides of the cylinder with
the load connected to the cylinder and the lock released.
Lurching of the cylinder when unlocked can be prevented by
carefully adjusting this air balance.
2. Adjust the mounting positions of the detectors on auto
switches, etc. When intermediate stops are to be performed,
adjust the mounting positions of detectors on auto switches,
etc., taking into consideration the overrun amount with respect
to the desired stopping positions.
Caution
JIS B 1181 Class 2
M14 x 1.5
JIS B 4636
+ 2 point angle socket 22
JIS B 4636
+ 2 point angle socket 24
Adjustment
Bore size (mm)
125
140
160
Tie-rod nut Socket
Width across flats
22
24
JIS B 1181 Class 2
M16 x 1.5
Lock unit
Wing nut
Conical spring
washer
Rod cover
Cylinder tie-rod
Unit holding tie-rod
Tie-rod nut,
Spring washer
Series CNS
Specific Product Precautions 2
Be sure to read before handling.

Manually Unlocking
Warning
4. Do not turn the unlocking cam (the arrow or mark on
the unlocking cam head) past the position marked
FREE. If it is turned too far, there is a danger of
damaging the unlocking cam.
5. For safety reasons, the unlocking cam is
constructed so that it cannot be fixed in the
unlocked condition.
Caution
Locked state
[Principle]
If the unlocking cam is turned clockwise with an adjustable
angle wrench or socket wrench, etc., the release piston is
pushed back and the lock is released.
Since the lever will return to its original position and become
locked again when it is released, it should be held in this
position for as long as unlocking is required.
Manually unlocked state
Pneumatic Circuit
Caution
2. [Vertical]
[Load in the direction of rod extension] [Load in the direction of rod retraction]
[Example]
1. [Horizontal]
Cylinder side Cylinder side
W
3 port
normally open
SOL.C
SOL.B
SOL.A
3 port
normally
closed
Regulator with relief function
W
SOL.B
SOL.C
SOL.A
W
SOL.C
SOL.A SOL.B
Bore size
(mm)
Cylinder
sliding
resistance
(N)
Cam unlocking
torque (standard)
(N·m)
Width across
flats
(mm)
Socket
125
140
160
961
1216
1579
16
18
21
JIS B 4636 + 2 point angle socket 16
JIS B 4636 + 2 point angle socket 18
JIS B 4636 + 2 point angle socket 21
68.6
78.4
156.8
Release pistonUnlocking cam
1. Never operate the unlocking cam until safety has
been confirmed. (Do not turn to the FREE side.)
•When unlocking is performed with air pressure applied to
only one side of the cylinder, the moving parts of the cylinder
will lurch at high speed causing a serious hazard.
•When unlocking is performed, be sure to confirm that
personnel are not within the load movement range and that
no other problems will occur if the load moves.
2. Before operating the unlocking cam, exhaust any
residual pressure which is in the system.
3. Take measures to prevent the load from dropping
when unlocking is performed.
• Perform work with the load in its lowest position.
• Take measures for drop prevention by strut, etc.
•Confirm that balanced pressure is applied to both sides of
the piston.
1. A 3 position pressure center solenoid valve and regulator with
check valve can be replaced with two 3 port normally open
valves and a regulator with relief function.
1. The unlocking cam is an emergency unlocking
mechanism only. During an emergency when the air
supply is stopped or cut off, this is used to alleviate
a problem by forcibly pushing back the release
piston and brake spring to release the lock.
2. When installing the cylinder into equipment or
performing adjustments, etc., be sure to apply air
pressure of 0.25 MPa or more to the unlocking port,
and do not perform work using the unlocking cam.
3.
When releasing the lock with the unlocking cam, it
must be noted that the sliding resistance of the
cylinder will be high, unlike normal unlocking with air
pressure.
Series CNS
Specific Product Precautions 3
Be sure to read before handling.

Maintenance
Caution
Warning
2. How to replace lock unit
1) Loosen the tie-rod nuts (4 pcs.) in the cylinder rod side by
using a socket wrench.
For the applicable socket, refer to the table below.
2) Apply compressed air of 0.3 MPa or more to the
unlocking port, and remove the lock unit.
Bore size
(mm)
125, 140
160
JIS B 1181 Class 2
M14 x 1.5
JIS B 4636
+ 2 point angle socket 22
JIS B 4636
+ 2 point angle socket 24
JIS B 1181 Class 2
M16 x 1.5
Nut
Width across
flats Socket
22
24
P ≥0.3 MPa
(old)
P ≥0.3 MPa
Temporary axis
(New)
3) Similarly, apply 0.3 MPa or more of compressed air to the
unlocking port of the new lock unit, and replace the new lock
unit’s temporary axis with the previous piston rod assembly.
4) Tighten the tie-rod nuts (4 pcs.) on the rod side of the
cylinder using a socket wrench.
1. Since a heavy duty spring is contained in the unit, there is a
serious hazard, such as the possibility of parts being ejected, if
disassembly is performed incorrectly. Therefore, do not loosen
or remove the hexagon socket head cap screws which secure
cover A and cover B.
2. Be sure to contact SMC regarding disassembly or repair, etc.
Never disassemble a lock unit of Series CNS.
Bore size (mm)
125
140
160
Lock unit part no.
CNS125D-UA
CNS140D-UA
CNS160D-UA
1. Lock units for Series CNS are replaceable.
To order replacement lock units for Series CNS, use the
order numbers given in the table below.
Series CNS
Specific Product Precautions 4
Be sure to read before handling.

Precautions on Model Selection Find the maximum load speed V.
Selection Example
Caution
Example)
Step (1): From graph (1) find the maximum movement speed of
the load
∴Maximum speed V: ≅280 mm/s
Step (2): Select Graph(6) based upon the load condition and
operating pressure, and then from the intersection of
the maximum speed V = 280 mm/s found in Step (1),
and the load weight m = 320 kg
∴ø140 씮select a CNS140 or larger bore size.
Find the bore size.
Load Condition
Operating Pressure
0.4 MPa ≤Graph (3)
0.3 MPa ≤Graph (2)
0.5 MPa ≤Graph (4)
Load in the direction at the right
angle to rod
(∗ Being held by a guide)
Load in the direction of rod extension
Load in the direction of rod retraction
0.4 MPa ≤Graph (6)
0.3 MPa ≤Graph (5)
0.5 MPa ≤Graph (7)
Graph (1)
V'
V
Cylinder
stroke
W
Movement distance
of load
m
F
m
F
30
1600 st
1400 st
1200 st
1000 st
800 st
600 st
500 st
400 st
300 st
200 st
100 st
20
10
5
4
3
2
1
0.5
0.4
0.3
0.2
0.1
Load movement time: t(S)
100 200 300 400 500
Maximum speed: V (mm/s)
280
m
F
Step (1)
Step (2)
Series CNS
Model Selection
1. In order that the originally selected maximum speed is not
exceeded, be certain to use a speed controller to adjust the
total movement distance of the load so that movement takes
place in no less than the applicable movement time.
The movement time is the time that is necessary for the load
to travel the total movement distance from the start without
any intermediate stops.
2. In cases where the cylinder stroke and the movement
distance of the load are different (double speed mechanism,
etc.), use the movement distance of the load for selection
purposes.
• Load weight: m= 320 kg
• Movement distance: st = 400 mm
• Movement time: t = 2 s
• Load condition: Vertical downward = Load in direction of
rod extension
• Operating pressure: P = 0.4 MPa
Find the maximum load speed: V (mm/s) from the load movement
time: t (s) and the movement distance: st (mm).
Select a graph based upon the load condition and operating
pressure, and then find the point of intersection for the maximum
speed found in Step (1) and the load weight. Select the bore size
on the line above the point of intersection.

Selection Graph
Graph (5)Graph (2)
Graph (6)Graph (3)
Graph (7)Graph (4)
Maximum speed: V (mm/s)
Load weight: m (kg)
Maximum speed: V (mm/s)
Load weight: m (kg)
Maximum speed: V (mm/s)
Load weight: m (kg)
Maximum speed: V (mm/s)
Load weight: m (kg)
Maximum speed: V (mm/s)
Load weight: m (kg)
Maximum speed: V (mm/s)
Load weight: m (kg)
0.3 MPa ≤P < 0.4 MPa 0.3 MPa ≤P < 0.4 MPa
0.4 MPa ≤P < 0.5 MPa 0.4 MPa ≤P < 0.5 MPa
0.5 MPa ≤P 0.5 MPa ≤P
100 500400300200
100 500400300200
100
1000
200
300
400
500
2000
3000
700
800
900
600
100 500400300200
100
1000
200
300
400
500
2000
3000
125
700
800
900
600
100 500400300200
100 500400300200
100
100
1000
200
300
400
500
2000
3000
700
800
900
600
100 500400300200
100
1000
200
300
400
500
2000
3000
700
800
900
600
1000
2000
3000
400
200
100
300
500
700
800
900
600
1000
2000
3000
400
200
300
500
700
800
900
600
ø160
ø140
ø125
ø125
ø160
ø140
ø125
ø160
ø140
ø125
ø160
ø140
ø125
ø160
ø140
ø125
ø160
ø140
280
320
Model Selection Series CNS