Pneumatic cylinder
CM2 Pneumatic cylinder
CM2 Air Cylinder
Specifications
- Material
- Aluminum alloy
- Operation pressure
- 0.1-0.9Mpa
- Working Medium
- Air
- Working temperature range
- -5-60 degree
CM2 Series Round-Body Pneumatic Cylinder
The CM2 Series is a compact round-body pneumatic cylinder designed to provide reliable linear motion in industrial automation, assembly equipment, packaging machinery and material-handling systems.
Available with 20 mm, 25 mm, 32 mm and 40 mm bore sizes, the CM2 cylinder combines a slim barrel, double-acting operation and stroke options up to 1000 mm. Standard models use rubber bumpers to absorb end-of-stroke impact, while optional air-cushion versions are available for applications requiring smoother deceleration.
Customers can choose between the standard CM2BÂ cylinder and the CDM2BÂ magnetic version for external piston-position detection.
Key Features
Compact Round-Body Design
The slim cylindrical barrel provides a smaller external profile than many square or tie-rod cylinders. It is suitable for machines with limited installation space.
Double-Acting Operation
Compressed air powers both extension and retraction, providing controlled force and movement in two directions.
Double-acting operation is suitable for:
- Pushing
- Pulling
- Clamping
- Positioning
- Lifting
- Stopping
- Opening and closing mechanisms
Four Bore Sizes
The series is available with:
- 20 mm bore
- 25 mm bore
- 32 mm bore
- 40 mm bore
The different bore sizes allow the cylinder output force to be matched to the machine load and available air pressure.
Stroke Range up to 1000 mm
The catalog specifies a stroke range of 0–1000 mm. This wide range allows the CM2 cylinder to be used for both compact movements and longer linear travel.
Long-stroke applications require careful evaluation of:
- Piston-rod buckling
- Side load
- Installation alignment
- Operating speed
- Moving mass
- External guide requirements
Standard Rubber Buffer
The standard CM2 cylinder uses rubber bumpers to reduce direct mechanical impact at the end of the piston stroke.
Optional Air Cushion
An air-cushioned version can be selected for applications involving higher speed, a larger moving mass or repeated cycling.
Pneumatic cushioning helps decelerate the piston before it reaches the end cover, reducing:
- End impact
- Operating noise
- Mechanical shock
- Vibration
- Wear on connected equipment
Magnetic-Sensing Option
The CDM2B version includes a magnetic piston for use with an external auto switch.
Magnetic position detection can provide:
- Extended-position confirmation
- Retracted-position confirmation
- PLC feedback
- Cycle monitoring
- Machine interlocking
- Fault detection
The exact auto-switch model, electrical configuration and mounting hardware should be confirmed separately.
Wide Operating-Speed Range
The specified piston-speed range is 50–750 mm/s, providing flexibility for both moderate-speed positioning and faster repetitive movements.
Technical Specifications
Item | Specification |
Product series | CM2 |
Cylinder type | Compact round-body pneumatic cylinder |
Acting type | Double acting |
Bore sizes | 20, 25, 32 and 40 mm |
Stroke range | 0–1000 mm |
Working medium | Compressed air |
Proof pressure | 1.5 MPa |
Approximate proof pressure | 15.3 kgf/cm² |
Maximum operating pressure | 1.0 MPa |
Approximate maximum pressure | 10.2 kgf/cm² |
Minimum operating pressure | 0.05 MPa |
Approximate minimum pressure | 0.5 kgf/cm² |
Operating-temperature range | -10°C to +70°C |
Operating-speed range | 50–750 mm/s |
Standard cushioning | Rubber buffer |
Optional cushioning | Air cushion |
Stroke-length tolerance | +1.4/0 mm |
Port size, 20 mm bore | G1/8 |
Port size, 25 mm bore | G1/8 |
Port size, 32 mm bore | G1/8 |
Port size, 40 mm bore | G1/4 |
Magnetic piston | Available with CDM2B version |
Motion type | Linear reciprocating motion |
The proof-pressure rating is used for product verification and must not be treated as the normal continuous operating pressure.
Bore Size and Port Selection
Bore Size | Port Size |
20 mm | G1/8 |
25 mm | G1/8 |
32 mm | G1/8 |
40 mm | G1/4 |
Always confirm that the pneumatic fittings use the correct G parallel-thread standard.
A fitting with an incompatible thread type may damage the cylinder port or fail to seal correctly.
Internal Structure
The supplied drawing identifies the following principal components:
No. | Component |
1 | Front cover |
2 | Back cover |
3 | Cylinder barrel |
4 | Piston |
5 | Piston rod |
6 | Oiled bearing |
7 | Front-cover seal ring |
8 | Anti-crash cushion |
9 | Piston seal |
10 | Wear ring |
Frequently Asked Questions
Is the CM2 cylinder double acting?
Yes. The supplied specification identifies the CM2 Series as double acting.
What bore sizes are available?
The standard bore sizes are 20, 25, 32 and 40 mm.
What is the available stroke range?
The catalog specifies strokes from 0 to 1000 mm.
What is the maximum operating pressure?
The maximum normal operating pressure is 1.0 MPa.
What is the proof pressure?
The proof pressure is 1.5 MPa. This is a test rating rather than the recommended continuous operating pressure.
What is the minimum operating pressure?
The specified minimum operating pressure is 0.05 MPa.
What is the operating-speed range?
The piston-speed range is 50–750 mm/s.
What is the operating-temperature range?
The specified range is -10°C to +70°C.
Does the CM2 cylinder have cushioning?
The standard version uses rubber buffers. An optional air-cushion version can be ordered with the A code.
What is the difference between CM2B and CDM2B?
CM2B is the normal version. CDM2B includes a magnetic piston for use with an external position sensor.
Are magnetic switches included?
The drawing identifies a magnetic-cylinder version but does not specify the switch model or whether it is included. Confirm the required switch, cable length and electrical configuration when ordering.
What air-port threads are used?
The 20, 25 and 32 mm bore models use G1/8 ports. The 40 mm bore model uses G1/4 ports.
Can the cylinder be used vertically?
Yes, provided the cylinder is correctly sized for the load and installed with appropriate guidance and safety measures. Consider the effect of gravity during both extension and retraction.
Can the CM2 cylinder support a side load?
Significant side load should not be applied directly to the piston rod. Use an external guide or suitable floating connection.
Can it be used with water, oil or other gases?
The specified working medium is compressed air. Other media require confirmation of seal, lubricant and material compatibility.

