Mini Free Mount Cylinder, ø12, ø16, ø20, CUJ Series (Part Numbers - CAD Download)

An air cylinder manufactured by SMC.
[Features]
· Miniature body.
· Concentrates wiring and piping on one side.
· With counterbore for mounting.

(i)Remark

See catalog for specification details.
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Product specification
Part Numbers
Catalog

Mini Free Mount Cylinder ø12, ø16, ø20, CUJ Series Specifications

How to Order

Specifications

Bore size (mm)		12	20
Action		Double acting; Single acting, spring return
Fluid		Air
Proof pressure		1.05 MPa
Minimum operating pressure	Double acting	0.07 MPa	0.05 MPa
Minimum operating pressure	Single acting, spring return	0.25 MPa	0.18 MPa
Maximum operating pressure		0.7 MPa
Ambient and fluid temperature		Without auto switch: -10 to 70℃ (No freezing) With auto switch: -10 to 60℃ (No freezing)
Cushion		Rubber bumper
Lubrication		Non-lube
Piston speed		50 to 500 mm/s∗
Stroke length tolerance		0 to +1.0
Mounting		CUJB: Through-hole (lateral, axial direction: 2 locations each) CUJS: Through-hole (axial direction: 2 locations)

∗ Depending on the circuit condition, the piston speed may not reach the maximum speed.

Symbol

Double acting, single rod, rubber bumper

Single acting, spring return, rubber bumper

Standard Stroke

Bore size (mm)	Operating direction	Standard stroke (mm)
12	Double acting	5, 10, 15, 20, 25, 30, 35, 40, 45, 50
16		5, 10, 15, 20, 25, 30, 35, 40, 45, 50
20		5, 10, 15, 20, 25, 30, 35, 40, 45, 50
12	Single acting, spring return	5, 10
16
20

Construction

Double Acting

Single Acting, Spring Return

Component Parts

No.	Description	Material	Note
1	Cylinder tube	Aluminum alloy	Hard anodized
2	Piston	Aluminum alloy	Trivalent chromated
3	Piston rod	Stainless steel
4	Collar	Aluminum alloy	Hard anodized
5	Magnet holder	Aluminum alloy	Trivalent chromated
6	Retaining ring	Steel for special applications	Phosphate coated
7	Magnet	-
8	Return spring	Steel wire	Zinc trivalent chromated
9	Element	Bronze casted	(for ø12, ø16)
9	Plug with fixed restrictor	Structural steel	Nickel plated (for ø20)
10	Damper A	Resin
11	Damper B	Resin
12	Rod end nut	Steel wire	Chromated
13	Piston seal	NBR
14	Rod seal	NBR
15	O-ring	NBR

Replacement Parts: Seal Kit
Double Acting

Bore size (mm)	Kit no.	Contents
12	CUJB12-PS	Set of ⑬⑭⑮ and grease pack.
16	CUJB16-PS
20	CUJB20-PS

∗ Seal kit ⑬ to ⑮comes as a set. Use the kit number for each bore size.
Single Acting, Spring Return

Bore size (mm)	Kit no.	Contents
12	CUJB12-S-PS	Set of ⑬ and grease pack.
16	CUJB16-S-PS
20	CUJB20-S-PS

∗ Use the following part number for ordering a grease pack only.
Grease part no.: GR-L-005 (5 g)

Dimensions: ø12, ø16, ø20 Double Acting; Single Acting, Spring Return

Part no.	Bore size (mm)	d	H₁	B₁	C₁
NTJ-015A	12	M5 x 0.8	4	8	9.2
NT-015A	16	M6 x 1	5	10	11.5
NT-02	20	M8 x 1.25	5	13	15

Bore size (mm)	A	B	C	D	E	GB	H	J	K	L	MM	NN	N	P	Q
12	3.5	17	26.5	6	6	4	11	15.5	11	8	M5 x 0.8	M3 x 0.5 effective depth of thread 6	3.5	M3 x 0.5	4.4 through
16	3.5	21	29.5	8	6	4	12.5	17	12.5	11.5	M6 x 1	M4 x 0.7 effective depth of thread 8	5.5	M3 x 0.5	4.4 through
20	4.5	25	36	10	7	5.5	15.5	21	15	13.5	M8 x 1.25	M5 x 0.8 effective depth of thread 7	7	M5 x 0.8	5.5 through

Bore size (mm)	QA	R	T	T'	U	V	W	Without magnet				Built-in magnet
Bore size (mm)	QA	R	T	T'	U	V	W	F	GA	S	Z	F	GA	S	Z
12	7.5 depth, depth of counterbore 7	11	9	10.5	14	5	26	3.5 (5)	7.5	15.5 (17)	19 (20.5)	7.5 (9)	7.5	19.5 (21)	23 (24.5)
16	7.5 depth, depth of counterbore 7	12.5	10	12	15.5	6	27.5	4	8.5	16.5	20	8.5	9	21	24.5
20	9.5 depth, depth of counterbore 9	15.5	12	14	18.5	8	30	5.5	8.5	19.5	24	9.5	8.5	23.5	28

∗ ( ): Single acting, spring return

Part no.	Bore size (mm)	d	H₁	B₁	C₁
NTJ-015A	12	M5 x 0.8	4	8	9.2
NT-015A	16	M6 x 1	5	10	11.5
NT-02	20	M8 x 1.25	5	13	15

Bore size (mm)	A	B	C	D	GB	H	J	K	L	MM	NN	N	P	Q	QA
12	3.5	17	26.5	6	4	11	15.5	11	8	M5 x 0.8	M3 x 0.5 effective depth of thread 6	3.5	M3 x 0.5	4.4 through	7.5 depth, depth of counterbore 5.5
16	3.5	21	29.5	8	4	12.5	17	12.5	11.5	M6 x 1	M4 x 0.7 effective depth of thread 8	5.5	M3 x 0.5	4.4 through	7.5 depth, depth of counterbore 5.5
20	4.5	25	36	10	5.5	15.5	21	15	13.5	M8 x 1.25	M5 x 0.8 effective depth of thread 7	7	M5 x 0.8	5.5 through	9.5 depth, depth of counterbore 6.5

Bore size (mm)	R	T	T'	U	V	W	Without magnet			Built-in magnet
Bore size (mm)	R	T	T'	U	V	W	GA	S	Z	GA	S	Z
12	11	9	10.5	14	5	26	7.5	15.5 (17)	19 (20.5)	7.5	19.5 (21)	23 (24.5)
16	12.5	10	12	15.5	6	27.5	8.5	16.5	20	9	21	24.5
20	15.5	12	14	18.5	8	30	8.5	19.5	24	8.5	23.5	28

∗ ( ): Single acting, spring return

Data to be displayed: 30; 45; 60

Part Number
CUJS20-25DM
CUJS20-30D
CUJS20-30DM
CUJS20-35D
CUJS20-35DM
CUJS20-40D
CUJS20-40DM
CUJS20-45D
CUJS20-45DM
CUJS20-50D
CUJS20-50DM

Standard Unit Price	Minimum order quantity	Standard Shipping Days ?	Cylinder Operation Method	Cylinder (Tube) Inner Diameter (Ø)	Stroke (mm)	Operating Temperature (℃)	Operating Pressure (MPa)	Auto Switch	Lead Wire Length (m)	Number of Switches	Rod Tip Shape	Lock unit magnet	Mount Type
36.90 €	1	4 Days	[Double Acting] Double Acting	20	25	-10～70	-	None	-	-	Male rod end	Without magnet	Axial mounting
36.11 €	1	22 Days	[Double Acting] Double Acting	20	30	-10～70	-	None	-	-	Female rod end	Without magnet	Axial mounting
36.90 €	1	4 Days	[Double Acting] Double Acting	20	30	-10～70	-	None	-	-	Male rod end	Without magnet	Axial mounting
36.90 €	1	26 Days	[Double Acting] Double Acting	20	35	-10～70	-	None	-	-	Female rod end	Without magnet	Axial mounting
37.69 €	1	4 Days	[Double Acting] Double Acting	20	35	-10～70	-	None	-	-	Male rod end	Without magnet	Axial mounting
36.90 €	1	4 Days	[Double Acting] Double Acting	20	40	-10～70	-	None	-	-	Female rod end	Without magnet	Axial mounting
37.69 €	1	4 Days	[Double Acting] Double Acting	20	40	-10～70	-	None	-	-	Male rod end	Without magnet	Axial mounting
37.63 €	1	26 Days	[Double Acting] Double Acting	20	45	-10～70	-	None	-	-	Female rod end	Without magnet	Axial mounting
38.40 €	1	26 Days	[Double Acting] Double Acting	20	45	-10～70	-	None	-	-	Male rod end	Without magnet	Axial mounting
37.63 €	1	4 Days	[Double Acting] Double Acting	20	50	-10～70	-	None	-	-	Female rod end	Without magnet	Axial mounting
38.40 €	1	26 Days	[Double Acting] Double Acting	20	50	-10～70	-	None	-	-	Male rod end	Without magnet	Axial mounting

Basic information

Rod Operation Method	Single Rods	Main Body Shape	Plate Cylinder	Additional Function	Standard
Environment, Applications	Standard	End Locking	NA	Valves	NA
Cushion	Rubber cushion	Custom-made Specifications	None

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Basic Attributes

Cylinder Operation Method
- Double Acting
  - Double Acting
  - With Return Spring
- Single Acting (Extruded)
Clear
Cylinder (Tube) Inner Diameter(Ø)
12

16

20
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Stroke(mm)
5

10

15

20

25

30

35

40

45

50
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Auto Switch
F8B

F8N

F8P

M9B

M9N

None
Clear
Lead Wire Length(m)
- 0.5
- 1
- 3
- 5
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Number of Switches
1 pc.

2 pcs.
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Rod Tip Shape
- Female rod end
- Male rod end
Clear
Lock unit magnet
- Built-in magnet
- Without magnet
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Mount Type
- Axial mounting
- Lateral mounting
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Type
- CDUJB
- CDUJS
- CUJB
- CUJS
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Product images may be representative images.
The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .