CUJ Series Mini Free Mount Cylinder, Bore Size 12 mm / 16 mm / 20 mm

Brand :

SMC

Caution

■ SMC Product Line
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Product Description

Mini free mount series of compact air cylinders.
[Features]
· Space-saving cylinder that reduces the overall length by up to 64% and reduces the volume by up to 70% compared with the same manufacturer's CU Series cylinders.
· With magnet: Shortened by up to approx. 20%, volume reduced by up to approx. 45%. (Compared with the same manufacturer's double acting type CQS cylinder with magnet.)
· Without magnet: Shortened by up to approx. 64%, volume reduced by up to approx. 70%. (Compared with the same manufacturer's double acting type CU cylinder without magnet.)
· With auto switch.

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

Dimensions (Without Magnet)

Tube inner diameter	A (a)	B (b)	C (c)
12	17 (−)	26.5 (−)	15.5 (−)
16	21 (20)	29.5 (32)	16.5 (30)
20	25 (26)	36 (40)	19.5 (36)

(Units: mm)

(): Dimensions of the same manufacturer's CU cylinder.

Dimensions: CUJ (A × B × C + stroke) CU (a × b × c + stroke)

Specifications

With counterbore for mounting
There is no protrusion for a mounting bolt.

Easy seal replacement
Seals can be replaced easily by just removing the retaining ring.

Bumper equipment as standard

Bore size mm		12	20
Action		Double acting / Single acting, spring return
Fluid		Air
Proof Pressure		1.05 MPa
Minimum operating pressure	Double-acting type	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 Working Fluid Temperature		Without auto switch: -10°C to 70°C (no freezing) With auto switch: -10°C to 60°C (no freezing)
Cushioning		Rubber cushion
Lubrication		Not required
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)

Standard Stroke

JIS symbol
Double acting, single rod, rubber bumper

Single acting, spring return, rubber bumper

Tube Inner Diameter (mm)	Action	Standard Stroke (mm)
12	Double-acting type	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

Spring Reaction Force: Single Acting, Spring Return

Spring in pre-loaded condition: When the spring is set in the cylinder

Spring in loaded condition: When the spring is contracted by applying air

Tube inner diameter (mm)	Spring condition	Stroke (mm)
Tube inner diameter (mm)	Spring condition	5	10
12	Pre-loaded	6	3.5
12	Loaded	9.5	9.5
16	Pre-loaded	7.5	4.5
16	Loaded	11	11
20	Pre-loaded	10.5	5.5
20	Loaded	16.5	16.5

(Unit: N)

*Moving the load with the thrust (spring response) on the spring return side will cause a poor stroke.

Weight Table

(Unit: g)

Tube inner diameter (mm)	Standard Stroke (mm)										Additional weight
Tube inner diameter (mm)	5	10	15	20	25	30	35	40	45	50	Built-in magnet	Rod end male thread
CUJ□12	21	26	31	35	40	45	50	55	60	65	6	4
CUJ□16	32	39	46	53	60	67	74	81	88	95	9	8
CUJ□20	52	62	72	82	92	102	112	122	132	142	12	13

Double-acting type

(Unit: g)

Tube inner diameter (mm)	Standard Stroke (mm)		Additional weight
Tube inner diameter (mm)	5	10	Built-in magnet	Rod end male thread
CUJ□12	23	28	6	4
CUJ□16	34	41	9	8
CUJ□20	53	63	11	13

Single acting, spring return