Air Cylinder, Double Acting CJ1 Series

Brand :
SMC
Caution
- See catalog for specification details.
- Product pictures are representations. CAD data is not supported for some model numbers.
Product Description
A double acting, compact type air cylinder.
[Features]
· A compact version of the 6‑mm-bore CJ2 double acting cylinder.
· Model: CJ1B4.
· Bore size: 4 mm.
· Standard stroke: 5 mm, 10 mm, 15 mm, 20 mm.
Air Cylinder, Double Acting CJ1 Series (Bore Size 4 mm) Specifications

CJ1 Series (Bore Size 4 mm) external appearance

Symbol (double acting / single rod, without cushion)

The piping direction on the rod cover side fitting can be moved freely within a range of ±90°
Specifications Table
| Operating method | Double acting, single rod |
|---|---|
| Applicable fluids | Air |
| Proof pressure | 1.05 MPa |
| Maximum operating pressure | 0.7 MPa |
| Minimum operating pressure | 0.2 MPa |
| Ambient temperature and working fluid temperature | -10°C to 70°C (no freezing) |
| Operating piston speed | 50 to 500 mm/s |
| Cushioning | None |
| Stroke length tolerance | +0.5 0 |
| Mounting style | Basic type |
| Lubrication | Not required (non-lube) |
Compatible Tubing
| Tubing type | Material | Size | Tube No. | ||
|---|---|---|---|---|---|
| O.D. | Bore size | ||||
| Metric size | Polyurethane | 4 mm | 2.5 mm | TU0425 | |
| Soft nylon | 4 mm | 2.5 mm | TS0425 | ||
Theoretical Output List
(Unit: N)
| Bore size (mm) | Rod diameter (mm) | Operating method | Piston area (mm2) | Operating pressure (MPa) | |||||
|---|---|---|---|---|---|---|---|---|---|
| 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | ||||
| 4 | 2 | OUT | 12.6 | 2.52 | 3.78 | 5.04 | 6.30 | 7.56 | 8.82 |
| IN | 9.4 | 1.88 | 2.82 | 3.76 | 4.70 | 5.64 | 6.58 | ||
Weight list
(Unit: g)
| Bore size (mm) | Cylinder stroke (mm) | Weight |
|---|---|---|
| 4 | 5 | 12.0 |
| 10 | 12.4 | |
| 15 | 12.8 | |
| 20 | 13.2 |
Structural drawing

CJ1 Series (Bore Size 4 mm) Structural Drawing
Component Parts
| Number | Description | Material | Note |
|---|---|---|---|
| 1 | Rod Cover | Brass | Electroless nickel plating |
| 2 | Cylinder tube | Brass | Electroless nickel plating |
| 3 | Piston | Stainless steel | - |
| 4 | Seal retainer | Brass | Electroless nickel plating |
| 5 | Fittings | Body: Brass | Electroless nickel plating |
| Gasket NBR + Stainless steel 304 | - | ||
| 6 | Rod Gasket | NBR | - |
| 7 | Piston Gasket | NBR | - |
| 8 | Tube gasket | NBR | - |
| 9 | Mounting nut | Iron | Nickel plating |
| 10 | Rod-end nut | Iron | Zinc chromate |
Dimensional Outline Drawing: Double Acting / Basic Style
(Unit: mm)

CJ1 Series (Bore Size 4 mm) dimensional outline drawing
Polyurethane tubing or soft nylon tubing with a bore size of 4 mm or 2.5 mm is used.
| Tube Internal Diameter (mm) | Symbol | |||||||
|---|---|---|---|---|---|---|---|---|
| S | Z | |||||||
| Stroke | ||||||||
| 5 | 10 | 15 | 20 | 5 | 10 | 15 | 20 | |
| 4 | 18 | 23 | 28 | 33 | 51 | 56 | 61 | 66 |
Precautions
- Piping: Do not force a connection in a way that lateral force is applied to the cylinder tube. This could cause the cylinder tube to slant and malfunction.
- Mounting: Do not install by directly grasping the cylinder tube. This could cause the tube to deform and malfunction. Do not install by directly grasping the piston rod with pliers, etc. Scratches on the piston rod will cause damage to the bearing or rod seal, resulting in malfunction and air leakage.
- See catalog for specification details.
- Product pictures are representations. CAD data is not supported for some model numbers.