SMC Networks CUJ Series User manual

Mini Free-mount Cylinder
Series CUJ
ø4, ø6, ø8, ø10
CAT.ES20-157 A

Mini Free-mount Cylinder
• Length is shortened by approx. 64% max.
• Volume is reduced by approx. 70% max.
(As compared with SMC Series CU cylinders without magnet)
C
+ Stroke
c
+ Stroke
b
A
a
B
CUJ
CU
Features 1
Miniature body
Dimensions (without magnet) (mm)
Numbers in parentheses are the dimensions of SMC Series CU cylinders.
Bore
Size
4
6
8
10
A (a)B (b)C (c)
10 (—)
13 (13)
13 (—)
13.5 (15)
15 (—)
19 (22)
21 (—)
22 (24)
13 (—)
13 (33)
13 (—)
13 (36)
10
15
19
13 + Stroke
17
13 18 + Stroke
26
21
13 18 + Stroke
33
22
13.5 18 + Stroke
38
ø10
ø8
ø6
ø4
CUJB4-4D
CDUJB6-8D
CDUJB8-15D
CDUJB10-20D

Series CUJ ø4, ø6, ø8, ø10
Features 2
(mm)
E
Pitch dimensions (without magnet)
Bore Size
4
6
8
10
E
10
13
13
13.5
Tolerance h9
Solid state switch
Model D-F8
Clean room series
Series 10-, 11-CUJ
With front boss (h9)
Centering can be done easily.
Series Variations
Action
Double acting
Single acting (spring return)
Double acting
Single acting (spring return)
Double acting
Single acting (spring return)
Double acting
Single acting (spring return)
Series
CUJ
Bore size
(mm)
Rod end
configuration
Stroke (mm)
Clean room
series
468101520
4
6
8
10


 









Male thread
Without thread
Nil
Female thread
Male thread
Solid state
switch
D-F8
D-F9
Auto switch
Free
Free
Free
Free

Concentrates wiring and
piping on one surface
Allows more efficient installation, since four
directions can be used freely.
Free-mount design
allows installation from
four directions. Fine pitch
mounting is
possible.
Two auto
switches
can be installed
even for 4mm
strokes.
Rod cover
Easy seal replacement
Seals can be replaced easily just by removing
the rod cover.

Series CUJ
How to Order
ø4, ø6, ø8, ø10
Mini Free-mount Cylinder
CDUJ B 6
6D
D
10
10
Basic (through type)
Mounting
B
4mm
6mm
8mm
10mm
Bore size
4
68
10
8
10
F8N S
With Auto Switch
With auto switch
(built-in magnet)
6mm
8mm
10mm
Bore size
6
Cylinder stroke (mm)
Double acting
Single acting (spring return)
Action
D
S
2 pcs.
1 pc.
Number of
auto switches
Nil
S
∗For applicable auto switch part numbers, select
a model from Table 2 below.
∗F9 includes one auto switch.
Auto switch type
Without auto switch (built-in magnet) Nil
Rod end female thread (without thread for ø4)
Rod end male thread
Rod end thread
Nil
M
Refer to "Table 1 Standard strokes" below.
CUJ B
Bore size (mm)
4
6
8, 10
4
6
8, 10
Double
acting
Single acting
(spring return)
Standard stroke (mm)
4, 6, 8, 10
4, 6, 8, 10, 15
4, 6, 8, 10, 15, 20
4, 6
4, 6, 8
4, 6, 8, 10
Table 1 Standard strokes
1
∗Lead wire length symbols: 0.5m ....... Nil (Example) F8N
3.0m ....... L (Example) F8NL
∗ Auto switches marked with a "" symbol are produced upon receipt of order.
––
Type
Table 2 Applicable auto switch models Refer to pages 11 to 14 for detailed specifications.
Special
function
Electrical
entry
Indicator
light Wiring
(output)
Perpendicular
Load voltage Auto switch
part number
Electrical entry
direction
Lead wire
length (m) Applicable
load
In-line
0.5
(Nil) 3
(L) 5 (Z)
DC AC
Grommet
Yes
3 wire
(NPN)
3 wire
(PNP)
24V
––
F8N
––
F8P
––
F8B
F9N
––
F9P
––
F9B
––
Relay,
PLC
––
2 wire
12V


















––
Solid state switch
Without Auto Switch
Action

Theoretical Output/Double Acting
Spring Reaction Force/Single Acting
Weights/Double Acting
Single Acting
Symbol
0.7
8.79
6.59
19.79
10.99
35.18
21.44
54.97
35.18
0.5
6.28
4.71
14.13
7.85
25.13
15.31
39.26
25.13
0.3
3.76
2.82
8.48
4.71
15.07
9.18
23.56
15.07
Operating pressure (MPa) (N)
Operating
direction Piston area
(mm²)
12.6
9.4
28.3
15.7
50.3
30.6
78.5
50.3
OUT
IN
OUT
IN
OUT
IN
OUT
IN
Rod size
(mm)
Bore size
(mm)
2
4
5
6
4
6
8
10
Bore size
(mm)
4
6
8
10
Spring
condition
Pre-loaded
Loaded
Pre-loaded
Loaded
Pre-loaded
Loaded
Pre-loaded
Loaded
4
1.70
2.55
2.45
3.33
4.67
6.47
5.04
6.77
6
1.27
2.55
2.01
3.33
3.76
6.47
4.18
6.77
8
––
––
1.57
3.33
2.86
6.47
3.31
6.77
10
––
––
––
––
1.96
6.47
2.45
6.77
Stroke (mm)
(N)
Bore size
(mm)
CUJB4
CUJB6
CUJB8
CUJB10
Standard stroke (mm)
7.2
12.4
15.6
17.9
7.9
13.6
17.0
19.4
46
8.6
14.8
18.4
20.8
810
9.3
16.0
19.7
22.3
15
––
18.9
23.0
25.9
20
––
––
26.4
29.5
––
2.7
3.0
3.2
Additional weight
With magnet
Rod end male thread
With magnet
Rod end male thread
0.4
0.8
1.5
2.6
(g)
Additional weight
––
2.4
2.5
2.4
0.4
0.8
1.5
2.6
CUJB4
CUJB6
CUJB8
CUJB10
Bore size
(mm)
Standard stroke (mm)
46810
7.2
12.8
15.8
17.9
7.9
14.0
17.2
19.4
––
15.2
18.6
20.8
––
––
19.9
22.3
(g)
Double acting/Single rod
Single acting/Spring return
→
IN
Spring in pre-loaded condition Spring in loaded condition
←
OUT
When the spring is contracted by applying air
When the spring is set in the cylinder
2
Specifications
Mini Free-mount Cylinder Series CUJ
Action
Fluid
Proof pressure
Max. operating pressure
Ambient and fluid
temperature
Cushion
Lubrication
Piston speed
Thread tolerance
Stroke length tolerance
Mounting
Min. operating
pressure MPa Double acting
Single acting
(spring return)
Double acting/Single acting (spring return)
Air
1.05MPa
46810
0.1MPa
0.2MPa
Without auto switch:
- 10°C to 70°C (with no freezing)
With auto switch: - 10°C to 60°C (with no freezing)
None
Non-lube
50 to 500mm/s
JIS class 2
Through hole
+0.5
0
0.7MPa
0.15MPa
0.3MPa
0.35MPa
OUT IN
Bore size (mm)

D
C
4
5
5
5
D
14
18
18
18
M2.5 x 14L
M3 x 18L
M3 x 18L
M3 x 18L
Model Mounting bolt
CUJB4-4
-6
-8
-10
CUJB6-4
-6
-8
-10
-15
CUJB8-4
-6
-8
-10
-15
-20
CUJB10-4
-6
-8
-10
-15
-20
B
21
23
25
27
22
24
26
28
33
22
24
26
28
33
38
22
24
26
28
33
38
M2.5 x 21L
M2.5 x 23L
M2.5 x 25L
M2.5 x 27L
M3 x 22L
M3 x 24L
M3 x 26L
M3 x 28L
M3 x 33L
M3 x 22L
M3 x 24L
M3 x 26L
M3 x 28L
M3 x 33L
M3 x 38L
M3 x 22L
M3 x 24L
M3 x 26L
M3 x 28L
M3 x 33L
M3 x 38L
A
4
5
5
5
Model Mounting bolt
CUJB4-4
-6
-8
-10
CUJB6-4
-6
-8
-10
-15
CUJB8-4
-6
-8
-10
-15
-20
CUJB10-4
-6
-8
-10
-15
-20
3
Series CUJ
Mounting
Through hole mounting bolts are available for mounting a cylinder.
To order bolts, add "CUJ-" at the beginning of the bolt description.
(Example) CUJ-M3 x 27L
A A C
B B
For axial mounting
Without Auto Switch For side mounting
D
18
18
18
M3 x 18L
M3 x 18L
M3 x 18L
C
5
5
5
Model Mounting bolt
CDUJB6-4
-6
-8
-10
-15
CDUJB8-4
-6
-8
-10
-15
-20
CDUJB10-4
-6
-8
-10
-15
-20
B
27
29
31
33
38
27
29
31
33
38
43
27
29
31
33
38
43
M3 x 27L
M3 x 29L
M3 x 31L
M3 x 33L
M3 x 38L
M3 x 27L
M3 x 29L
M3 x 31L
M3 x 33L
M3 x 38L
M3 x 43L
M3 x 27L
M3 x 29L
M3 x 31L
M3 x 33L
M3 x 38L
M3 x 43L
A
5
5
5
Model Mounting bolt
CDUJB6-4
-6
-8
-10
-15
CDUJB8-4
-6
-8
-10
-15
-20
CDUJB10-4
-6
-8
-10
-15
-20
For axial mounting
With Auto Switch For side mounting
Axial mounting Side mounting

4
 Clean Room Series
How to Order
Specifications
The specifications are the same as those for the standard
double acting type. Refer to page 2.
Dimensions
Mini Free-mount Cylinder Series CUJ
10 6
Clean room series
Magnet
Double acting
Rod end thread
8D
C D UJB
10
11 Relief type
Vacuum type
Nil
6mm
8mm
10mm
Without
With (built-in)
D
Nil
MRod end female thread
Rod end male thread
Number of auto switches
Nil
S2 pcs.
1 pc.
Auto switch type
Nil Without auto switch (built-in magnet)
Bore size
6
8
10
F8N
Stroke
The specifications are the same as those for the standard
double acting type. Refer to the standard stroke table on page 1.
∗Applicable auto switch part numbers are the same
as those for the standard double acting type.
Refer to page 1.
Without auto switch With auto switch
ABCABC
24 18 29 2311.5 16.5
6, 8, 10
Bore size
(mm)
(mm)
2-M3 x 0.5
(port size)
M3 x 0.5
(Relief port: 10–See above)
(Vacuum port: 11–See above)
3C +Stroke
B+ Stroke
A+ Stroke
3.5
11 3.5

5
Series CUJ
Construction
Double acting
Single acting
Without magnet
Rod end male thread
For ø4
Built-in magnet
Built-in magnetWithout magnet
!3 weq!1 ryoe
t
!2
uir y o ewieu !0
Replacement parts: Seal kits (double acting)
Kit no.
CUJB4-PS
CUJB6-PS
CUJB8-PS
CUJB10-PS
Bore size
4
6
8
10
Contents
Above numbers 11, 12, 13 and
an exclusive grease pack.
Replacement parts: Seal kits (single acting)
Kit no.
CUJB4-S-PS
CUJB6-S-PS
CUJB8-S-PS
CUJB10-S-PS
Bore size
4
6
8
10
Contents
Above number 11 and
an exclusive grease pack.
Parts list
No. Description
Cylinder tube
Rod cover
Piston
Piston rod
Seal retainer
Magnet retainer
Return spring
Bronze element
Magnet
Rod end nut
Piston seal
Rod seal
Tube gasket
Material
Aluminum alloy
Bronze alloy
Stainless steel
Aluminum alloy
Stainless steel
Stainless steel
Aluminum alloy
Piano wire
Sintered metal BC
––
Steel
NBR
NBR
NBR
Note
Hard anodized
Electroless nickel plated
Chromated
CUJB4 only
Chromated
Nickel plated
1
2
3
4
5
6
7
8
9
10
11
12
13
Without switch
With switch

6
Mini Free-mount Cylinder Series CUJ
Dimensions for ø4 Double Acting/Single Acting
Without magnet/CUJB4
12.5
7
6
1.6
ø2
M2 x 0.4
Width across flats 4
2.5
Element
Single acting
4.6
4
M2 x 0.4
1.6
Rod end nut part no.: NTJ-004
Rod end male thread
Note) The angular position of the width across flats is not fixed with respect to the tube.
10
5
15
2-ø2.8 through
18.5 + Stroke
13 + Stroke
63.5
7.5 + Stroke 2-ø2.8 through
Width across flats 5
2-M3 x 0.5
(bore size)
2.5
7.57.5
5
5
ø6h9
ø2
2.5
3

7
Series CUJ
Single acting
Single acting
Rod end nut part no.: NTJ-006A
Rod end male thread
Element
12.5
6.5
5.5
2.4
ø4
ø9h9
M3 x 0.5
Width across flats 5.5
Width across flats 3.5
2.5
5.5
6.4
M3 x 0.5
2.4
2-ø3.3 through 2-ø3.3 through
Width across flats 8
2-M3 x 0.5
(bore size)
13
7
3
19
M2.5 x 0.45 effective depth 5
19 + Stroke
13 + Stroke
6.5 + Stroke3
63.5
ø4
ø9h9
Width across flats 3.5
910
7
7
3
2.5
3
24 + Stroke
18 + Stroke
11.5 + Stroke
3
[5.3]
[Approx.24]
[Auto switch]
Element
Note) The angular position of the width across flats is not fixed with respect to the tube.
Dimensions for ø6 Double Acting/Single Acting
Without magnet/CUJB6
Built-in magnet/CDUJB6

8
Mini Free-mount Cylinder Series CUJ
Dimensions for ø8 Double Acting/Single Acting
Without magnet/CUJB8
Built in magnet/CDUJB8
Note) The angular position of the width across flats is not fixed with respect to the tube.
Single acting
Rod end male thread
Single acting
Element
ø5
ø11h9
14.5
8.5 2.5
7
3.2
M4 x 0.7
Width across flats 7
Width across flats 4.5
Rod end nut part no.: NTJ-010A
3.2
7
8.1
M4 x 0.7
2-ø3.3 through 2-ø3.3 through
Width across flats 10
2-M3 x 0.5
(bore size)
M3 x 0.5 effective depth 6
Width across flats 4.5
13
7
3
21
19 + Stroke
13 + Stroke
6.5 + Stroke
3
63.5
ø5
ø11h9
1011
8
8
3
2.5
3
24 + Stroke
18 + Stroke
11.5 + Stroke3
[5.3]
[Approx.25]
[Auto switch]
Element

9
Series CUJ
Single acting
Single acting
Rod end nut part no.: NTJ-015A
Rod end male thread
Element
ø6
ø12h9
16.5
10.5
9
4
M5 x 0.8
Width across flats 8
Width across flats 5
4
8
9.2
M5 x 0.8
2-ø3.3 through 2-ø3.3 through
Width across flats 11
2-M3 x 0.5
(bore size)
M3 x 0.5 effective depth 6
Width across flats 5
13.5
7
3.2
22
19 + Stroke
13 + Stroke
6.5 + Stroke
3
63.5
ø6
ø12h9
10.511.5
8.5
8.5
33
24 + Stroke
18 + Stroke
11.5 + Stroke
3
[5.6]
[Approx.25.5]
[Auto switch]
Element
2.5
2.5
Dimensions for ø10 Double Acting/Single Acting
Without magnet/CUJB10
Built-in magnet/CDUJB10
Note) The angular position of the width across flats is not fixed with respect to the tube.

10
Mini Free-mount Cylinder Series CUJ
Proper Auto Switch Mounting Position for Stroke End Detection (ø6, ø8, ø10 common)
When Using Cylinders Adjacently
Auto Switch Mounting
D-F8N, F8P, F8B D-F9N, F9P, F9B
•When detecting extended stroke end •When detecting retracted stroke end
Note 2)
11 3
7 –Stroke length
in mm 3 + Stroke length
in mm 7
10mm or more
10mm or more
1. When cylinders with auto switches are adjacent to one another
as shown in the figure below, provide at least the amount of
space shown in the tables below between them.
If the space is not sufficient, the magnets in adjacent cylinders may
cause auto switches to malfunction.
∗ The space can be reduced by
attaching shielding plates (steel
plates 0.2 to 0.3mm thick) to the
sides of the cylinders facing each
other. In the case of bore size ø6,
be sure to attach a plate on
Cylinder A (on the surface opposite
to the switch groove).
2. In the case of bore size ø6 cylinders with auto switches,
keep the switch groove side surface at least 2.5mm away
from a magnetic substance.
If a magnetic substance is closer than 2.5mm, auto switches
may malfunction due to a drop in magnetic force.
∗ If this surface is to be used for mounting, a spacer composed of a non-
magnetic substance (aluminum, etc.) is required as shown in the figure
below.
L
d
Bore 19
6
ø619
6
ø819.5
6
ø10
L
d
Cylinder BCylinder A
Auto switch
Without shielding plate
L
d
Bore 16
3
ø613.5
0.5
ø814
0.5
ø10
With shielding plate
Auto switch
Non-magnetic spacer of
2.5mm or more
CUJ cylinder
Magnetic
substance
Set screw
Watchmakers screw driver
Note 1) Solid state switch:D-F9includes one auto switch.
Note 2) To prevent interference caused by the lead wire, provide a clearance of 10mm
or more in addition to the dimensions stated above.Negative numbers indicate
recess, positive numbers indicate protrusion.
•When tightening an auto switch mounting screw, use a watchmakers
screw driver with a handle of approximately 5 to 6mm in diameter.
•Use a tightening torque of approximately 0.10 to 0.20N⋅m.

Auto Switch Common Specifications
Lead Wire Lengths
Type
Operating time
Impact resistance
Insulation resistance
Withstand voltage
Ambient temperature
Enclosure
Solid state switch
1ms or less
1000m/s²
1000VAC for 1min.
(between lead wire and case)
50MΩ or more at 500VDC (between lead wire and case)
–10 to 60°C
IEC529 standard IP67,
JISC0920 watertight construction
Series CUJ
Auto Switch Common Specifications
Lead Wire Color Changes
D
-
F9P

How to specify lead wire length
(Example)
Nil
L
Z
0.5m
3m
5m
L
D
-
F9PL
-
 Flexible specification
(Example) 61
Output (+)
Output (–)
Old
Red
Black
New
Brown
Blue
2 wire 3 wire
Power supply (+)
Power supply GND
Output
Old
Red
Black
White
New
Brown
Blue
Black
Lead wire colors of SMC auto switches have been changed as shown in the
tables below starting from production in September 1996, in order to meet the
IEC947-5-2 standard.
Take special care regarding wire polarity during the time when the old colors still
coexist with the new colors.
11
Lead wire length
Note 1) Lead wire length Z: Auto switch applicable to 5m length
Solid state switches: All models produced upon receipt of order (standard procedure).
Note 2) For solid state with flexible wire specification, add "-61" after the lead wire length.

Basic Wiring
Solid state 3-wire, NPN
Sink input specifications
2-wire
Source input specifications
2-wire with 2-switch AND connection 2-wire with 2-switch OR connection
2-wire 2-wire
Solid state 3-wire, PNP
Example: Power supply is 24VDC
Internal voltage drop in switch is 4V Example: Load impedance is 3kΩ
Leakage current from switch is 1mA
(Power supplies for switch and load are separate.)
Connection Examples for AND (Series) and OR (Parallel)
Examples of Connection to PLC
Connect according to the applicable
PLC input specifications, as the con-
nection method will vary depending
on the PLC input specifications.
When two switches are
connected in series, a load
may malfunction because
the load voltage will drop
when in the ON state.
The indicator lights will
light up if both of the
switches are in the ON
state.
<Solid state>
When two switches
are connected in
parallel, malfunction
may occur because
the load voltage will
increase when in
the OFF state.
Blue
[Black]
Main
switch
circuit Load
Brown
[Red]
Black
[White]
Main
switch
circuit
Brown
[Red]
Load
Blue
[Black]
Black
[White]
Main
switch
circuit
Load
Blue
[Black]
Brown
[Red]
Main
switch
circuit
Load
Blue
[Black]
Brown
[Red]
Main
switch
circuit
Load
Brown
[Red]
Blue
[Black]
Black
[White]
PLC internal circuit
COM
Switch
Input
Black
[White]
Brown
[Red]
Blue
[Black]
PLC internal circuit
COM
Switch
Input
Brown
[Red]
Blue
[Black] PLC internal circuit
Switch
Input
COM
Blue
[Black]
Brown
[Red]
PLC internal circuit
COM
Switch
Input
Black
[White]
Brown
[Red]
Blue
[Black]
Switch 1
Switch 2
Load
Blue
[Black]
Brown
[Red]
Blue
[Black]Brown
[Red]
Switch 1
Switch 2
Load
Brown
[Red]
Blue
[Black]
Brown
[Red]
Blue
[Black]
3-wire OR connection for NPN output
Switch 1
Switch 2
Load
Switch 1
Brown
[Red]
Switch 2
Black
[White]
Blue
[Black]
Relay
Relay
Black
[White]
Load
Relay
contact
AND connection for NPN output
(using relays)
Switch 1
Brown
[Red]
Switch 2
Load
Brown
[Red]
AND connection for NPN output
(performed with switches only)
The indicator lights will light up when
both switches are turned ON.
<Solid state>
3-wire, NPN 3-wire, PNP
Brown [Red]
Blue
[Black]
Blue
[Black]
Black
[White]
Black
[White]
Blue
[Black]
Brown
[Red]
Blue
[Black]
Black
[White]
Blue
[Black]
Black
[White]
Brown
[Red]
Load voltage at ON = –x 2 pcs.
= 24V –4V x 2 pcs.
= 16V
Power supply
voltage Internal
voltage
drop Leakage
current Load
impedance
Load voltage at OFF = x 2 pcs. x
= 1mA x 2 pcs. x 3kΩ
= 6V
Note) Lead wire colors inside [ ] are those prior
to conformity with IEC standards.
Series CUJ
Auto Switch Wiring Connections
and Examples
12

13
Auto Switch Internal Circuits
D-F9N
D-F9B
D-F9P
Grommet Auto Switch Specifications
Auto SwitchWeights
Auto Switch Dimensions
D-F9(with indicator light )
Auto switch part no.
Electrical entry direction
Wiring type
Output type
Applicable load
Power supply voltage
Current consumption
Load voltage
Load current
Internal voltage drop
Leakage current
Indicator light
Model
Lead wire length 0.5m
Lead wire length 3m
D-F9N
7
37
D-F9P
7
37
D-F9B
6
31
D-F9N, D-F9P, D-F9B
1.5V or less
(0.8V or less at a load
current of 10mA)
Red LED lights when ON
100µA or less at 24VDC
OUT
Black
[White]
DC (+)
Brown
[Red]
DC (–)
Blue
[Black]
DC (+)
Brown
[Red]
DC (–)
Blue
[Black]
OUT
Black
[White]
OUT (+)
Brown
[Red]
OUT (–)
Blue
[Black]
(g)
Solid State Auto Switches/Direct Mount Type
D-F9N, D-F9P, D-F9B
D-F9N
In-line
NPN
28VDC or less
40mA or less
D-F9P
In-line
PNP
––
80mA or less
0.8V or less
D-F9B
In-line
2 wire
––
24VDC relay, PLC
––
––
24VDC (10 to 28VDC)
5 to 40mA
4V or less
0.8mA or less
Main
switch circuit
Main
switch circuit
Main
switch circuit
10mA or less
3 wire
IC circuit, Relay, PLC
5, 12, 24VDC (4.5 to 28VDC)
• Lead wires —Heavy duty oil resistant vinyl cord, ø2.7, 0.5m
D-F9N, D-F9P 0.15mm² x 3 wire (Brown, Black, Blue [Red, White, Black])
D-F9B 0.18mm²x 2 wire (Brown, Blue [Red, Black])
Note 1) Refer to page 11 for solid state switch common specifications.
Note 2) Refer to page 11 for lead wire lengths.
Lead wire colors inside [ ] are those prior to
conforming with IEC standards.

D-F8N
D-F8B
D-F8P
Auto Switch Specifications
Auto Switch Weights
Auto Switch Dimensions
Auto switch part no.
Electrical entry direction
Wiring type
Output type
Applicable load
Power supply voltage
Current consumption
Load voltage
Load current
Internal voltage drop
Leakage current
Indicator light
Model
Lead wire length 0.5m
Lead wire length 3m 7
32
D-F8N D-F8P D-F8B
D-F8N
Perpendicular
NPN
28VDC or less
40mA or less
D-F8B
Perpendicular
2 wire
—
24VDC relay, PLC
—
—
24VDC (10 to 28VDC)
2.5 to 40mA
4V or less
0.8mA or less at 24VDC
D-F8P
Perpendicular
PNP
—
80mA or less
0.8V or less
D-F8N, D-F8P, D-F8B
1.5V or less
(0.8V or less at a load
current of 10mA)
Red LED lights when ON
100µA or less at 24VDC
OUT
Black
[White]
DC (+)
Brown
[Red]
DC (–)
Blue
[Black]
Main switch
circuit
DC (+)
Brown
[Red]
DC (–)
Blue
[Black]
OUT
Black
[White]
Main switch
circuit
Main switch
circuit
OUT (+)
Brown
[Red]
OUT (–)
Blue
[Black]
(g)
3 wire
IC circuit, 24VDC relay, PLC
5, 12, 24VDC (4.5 to 28VDC)
10mA or less
Grommet D-F8(with indicator light)
Auto Switch Internal Circuits
Lead wire colors inside [ ] are those
prior to conformity with IEC standards.
14
10
4.6
2.8
2
4.3
ø2.7
4
3.1 10.9 3
8
Mounting screw M2.5 x 4l
Slotted set screw
Indicator light
Most sensitive position
Solid State Auto Switches/Direct Mount Type
D-F8N, D-F8P, D-F8B
•Lead wires –– Heavy duty oil resistant vinyl cord, ø2.7, 0.5m
D-F8N, D-F8P 0.15mm²x 3 wire (Brown, Black, Blue [Red, White, Black])
D-F8B 0.18mm²x 2 wire (Brown, Blue [Red, Black])
Note 1) Refer to page 11 for auto switch common specifications.
Note 2) Refer to page 11 for lead wire lengths.

Series CUJ
Safety Instructions
Note 1) ISO 4414: Pneumatic fluid power –– Recommendations for the application of equipment to transmission
and control systems
Note 2) JIS B 8370: General Rules for Pneumatic Equipment
Warning
Caution : Operator error could result in injury or equipment damage.
Warning : Operator error could result in serious injury or loss of life.
Danger : In extreme conditions, there is a possible result of serious injury or loss of life.
These safety instructions are intended to prevent a hazardous situation and/or
equipment damage. These instructions indicate the level of potential hazard by a
label of "Caution", "Warning" or "Danger". To ensure safety, be sure to observe
ISO 4414
Note 1),JIS B 8370 Note 2) and other safety practices.
1. The compatibility of pneumatic equipment is the responsibility of the person
who designs the pneumatic system or decides its specifications.
Since the products specified here are used in various operating conditions, their compatibility for the
specific pneumatic system must be based on specifications or after analysis and/or tests to meet your
specific requirements.
2. Only trained personnel should operate pneumatically operated machinery and
equipment.
Compressed air can be dangerous if handled incorrectly. Assembly, handling or repair of pneumatic
systems should be performed by trained and experienced operators.
3. Do not service machinery/equipment or attempt to remove components until
safety is confirmed.
1. Inspection and maintenance of machinery/equipment should only be performed after confirmation of
safe locked-out control positions.
2. When equipment is to be removed, confirm the safety process as mentioned above. Cut the supply
pressure for this equipment and exhaust all residual compressed air in the system.
3. Before machinery/equipment is restarted, take measures to prevent shooting-out of cylinder piston
rod, etc. (Bleed air into the system gradually to create back pressure.)
4. Contact SMC if the product is to be used in any of the following conditions:
1. Conditions and environments beyond the given specifications, or if product is used outdoors.
2. Installation on equipment in conjunction with atomic energy, railway, air navigation, vehicles, medical
equipment, food and beverages, recreation equipment, emergency stop circuits, press applications, or
safety equipment.
3. An application which has the possibility of having negative effects on people, property, or animals,
requiring special safety analysis.
15
Series CUJ
Safety Instructions
Note 1) ISO 4414: Pneumatic fluid power –– Recommendations for the application of equipment to transmission
and control systems
Note 2) JIS B 8370: General Rules for Pneumatic Equipment
Warning
Caution : Operator error could result in injury or equipment damage.
Warning : Operator error could result in serious injury or loss of life.
Danger : In extreme conditions, there is a possible result of serious injury or loss of life.
These safety instructions are intended to prevent a hazardous situation and/or
equipment damage. These instructions indicate the level of potential hazard by a
label of "Caution", "Warning" or "Danger". To ensure safety, be sure to observe
ISO 4414
Note 1),JIS B 8370 Note 2) and other safety practices.
1. The compatibility of pneumatic equipment is the responsibility of the person
who designs the pneumatic system or decides its specifications.
Since the products specified here are used in various operating conditions, their compatibility for the
specific pneumatic system must be based on specifications or after analysis and/or tests to meet your
specific requirements.
2. Only trained personnel should operate pneumatically operated machinery and
equipment.
Compressed air can be dangerous if handled incorrectly. Assembly, handling or repair of pneumatic
systems should be performed by trained and experienced operators.
3. Do not service machinery/equipment or attempt to remove components until
safety is confirmed.
1. Inspection and maintenance of machinery/equipment should only be performed after confirmation of
safe locked-out control positions.
2. When equipment is to be removed, confirm the safety process as mentioned above. Cut the supply
pressure for this equipment and exhaust all residual compressed air in the system.
3. Before machinery/equipment is restarted, take measures to prevent shooting-out of cylinder piston
rod, etc. (Bleed air into the system gradually to create back pressure.)
4. Contact SMC if the product is to be used in any of the following conditions:
1. Conditions and environments beyond the given specifications, or if product is used outdoors.
2. Installation on equipment in conjunction with atomic energy, railway, air navigation, vehicles, medical
equipment, food and beverages, recreation equipment, emergency stop circuits, press applications, or
safety equipment.
3. An application which has the possibility of having negative effects on people, property, or animals,
requiring special safety analysis.
15

Series CUJ
Actuator Precautions 1
Be sure to read before handling.
Design
Warning
1. There is a danger of sudden action by air
cylinders if sliding parts of machinery are
twisted, etc., and changes in forces occur.
In such cases, human injury may occur; e.g., by catching
hands or feet in the machinery, or damage to the machinery
itself may occur. Therefore, the machine should be designed
to avoid such dangers.
2. A protective cover is recommended to minimize
the risk of human injury.
If a driven object and moving parts of a cylinder pose a danger
of human injury, design the structure to avoid contact with the
human body.
3. Securely tighten all stationary parts and
connected parts so that they will not be-
come loose.
Especially when a cylinder operates with high frequency or is
installed where there is a lot of vibration, ensure that all parts
remain secure.
4. A deceleration circuit or shock absorber may be
required.
When a driven object is operated at high speed or the load is
heavy, a cylinder’s cushion will not be sufficient to absorb the
impact. Install a deceleration circuit to reduce the speed
before cushioning, or install an external shock absorber to
relieve the impact. In this case, the rigidity of the machinery
should also be examined.
5. Consider a possible drop in circuit pressure
due to a power outage, etc.
When a cylinder is used in a clamping mechanism, there is a
danger of work pieces dropping if there is a decrease in
clamping force due to a drop in circuit pressure caused by a
power outage, etc. Therefore, safety equipment should be
installed to prevent damage to machinery and human injury.
Suspension mechanisms and lifting devices also require
consideration for drop prevention.
6. Consider a possible loss of power source.
Measures should be taken to protect against human injury and
equipment damage in the event that there is a loss of power to
equipment controlled by pneumatics, electricity or hydraulics,
etc.
7. Design circuitry to prevent sudden lurching
of driven objects.
When a cylinder is driven by an exhaust center type
directional control valve or when starting up after residual
pressure is exhausted from the circuit, etc., the piston and its
driven object will lurch at high speed if pressure is applied to
one side of the cylinder because of the absence of air
pressure inside the cylinder. Therefore, equipment should be
selected and circuits designed to prevent sudden lurching,
because there is a danger of human injury and/or damage to
equipment when this occurs.
8. Consider emergency stops.
Design so that human injury and/or damage to machinery and
equipment will not be caused when machinery is stopped by a
safety device under abnormal conditions, such as a power
outage or a manual emergency stop.
Design
Warning
9. Consider the action when operation is re-
started after an emergency stop or abnormal
stop.
Design the machinery so that human injury or equipment
damage will not occur upon restart of operation.
When the cylinder has to be reset at the starting position,
install safe manual control equipment.
Selection
Caution
Warning
1. Confirm the specifications.
The products included in this catalog are designed according
to use in industrial compressed air systems. If the products
are used in conditions where pressure and/or temperature
are out of specification, damage and/or malfunction may be
caused. Do not use in these conditions. (Refer to
specifications.)
Consult SMC if you use a fluid other than compressed air.
2. Intermediate stops
When intermediate stopping of a cylinder piston is performed
with a 3 position closed center type directional control valve, it
is difficult to achieve stopping positions as accurate and
precise as with hydraulic pressure due to the compressibility
of air.
Furthermore, since valves and cylinders are not guaranteed
for zero air leakage, it may not be possible to hold a stopped
position for an extended period of time. Contact SMC in case
it is necessary to hold a stopped position for an extended
period.
1. Operate within the limits of the maximum
usable stroke.
The piston rod will be damaged when operated with a stroke
exceeding the maximum stroke range. Refer to the air
cylinder selection procedures regarding the maximum usable
stroke.
2. Operate the piston within a range such that
collision damage will not occur at the end of
the stroke.
Operate within a range such that damage will not occur when
the piston having inertial force stops by striking the cover at
the stroke end. Refer to the cylinder selection procedures for
the range within which damage will not occur.
3. Use a speed controller to adjust the cylinder
drive speed, gradually increasing from a low
speed to the desired speed setting.
4. Provide an intermediate support for a
cylinder with a long stroke.
If the cylinder has a long stroke, provide an intermediate
support to prevent the rod from sagging and the tube from
bending, as well as to prevent damage to the rod due to
vibrations or external loads.
16

Series CUJ
Actuator Precautions 2
Be sure to read before handling.
Caution
Warning
Caution
Piping
Caution
1. Preparation before piping
Before piping is connected, it should be thoroughly blown out
with air (flushing) or washed to remove chips, cutting oil and
other debris from inside the pipe.
2.Wrapping of sealant tape
When screwing together pipes and fittings, etc., be certain
that chips from the pipe threads and sealing material do not
get inside the piping.
Also, when sealant tape is used, leave 1.5 to 2 thread ridges
exposed at the end of the threads.
Wrapping direction
Sealant tape
Expose approx. 2 threads
17
1. Lubrication of non-lube type cylinder
The cylinder is lubricated at the factory and can be used
without any further lubrication.
However, in the event that it will be lubricated, use class 1
turbine oil (with no additives) ISOVG32.
Stopping lubrication later may lead to malfunction due to the
loss of the original lubricant. Therefore, lubrication must be
continued once it has been started.
Lubrication
Caution
Air Supply
1. Use clean air.
Do not use compressed air that includes chemicals, synthetic
oils containing organic solvents, salt or corrosive gases, etc.,
as it can cause damage or malfunction.
1. Install air filters.
Install air filters at the upstream side of valves. The filtration
degree should be 5µm or finer.
2. Install an air dryer, after-cooler or water
separator, etc.
Air that includes excessive drainage may cause malfunction
of valves and other pneumatic equipment. To prevent this,
install an air dryer, after-cooler or water separator, etc.
3. Use the product within the specified range
of fluid and ambient temperature.
At temperatures of 5°C or lower, take measures to prevent
freezing, since moisture in circuits may be frozen and this can
cause damage to seals and lead to malfunction.
Refer to SMC’s “Air Cleaning Equipment”catalog for further
details on compressed air quality.
Mounting
1. Be sure to connect so that the rod axis is
aligned with the load and movement direction.
If they are not aligned, stress could be applied to the rod and
the tube, causing the inner surface of the tube, the bushing, the
rod surface, and the seals to wear and to become damaged.
2. Do not scratch or gouge the sliding parts of
the cylinder tube or piston rod by striking or
grasping them with other objects.
Cylinder bores are manufactured to precise tolerances, so that
even a slight deformation may cause malfunction.
Also, scratches or gouges in the piston rod may lead to
damaged seals and cause air leakage.
3. Do not use until you verify that equipment
can operate properly.
Following mounting, repair or conversions, verify correct
mounting by suitable function and leakage tests after
compressed air and power are connected.
4. Instruction manual
The product should be mounted and operated after thoroughly
reading the manual and understanding its contents.
Keep the instruction manual where it can be referred to as
needed.