SMC CDM2B20-250-H7B-50 Round Body Cylinder Double Acting 145PSI 1.0MPA

( Brand: Smc ), ( Manufacturer Part Number: CDM2B20-250-H7B-50 ), ( Part Type: Cylinder ), ( Suitable Media: Compressed Air ), ( Cylinder Type: Single-rod Cylinder ), ( Cylinder Action: Double-acting ), ( Country Of Origin: Japan )

Review SMC Round Body Cylinder Double Acting 145psi

The **SMC CDM2B20-250-H7B-50** is a high-performance, double-acting pneumatic cylinder designed for precision control and reliable operation in demanding industrial applications. Part of SMC s renowned **CDM2 series**, this round-body cylinder features a robust, compact yet durable construction optimized for efficiency and longevity. With a **bore size of 20 mm (0.787 inches)** and a **stroke length of 250 mm (9.84 inches)**, it delivers a powerful yet controlled linear motion ideal for automation, packaging, assembly lines, and material handling systems where consistent force and positioning are critical. The cylinder operates at a maximum working pressure of **145 psi (1.0 MPa)**, ensuring robust performance across a wide range of tasks while maintaining energy efficiency. Its **double-acting design** allows for bidirectional force, enabling precise control in both extension and retraction phases, making it versatile for applications requiring bidirectional motion, such as clamping, indexing, or pushing/pulling operations.

The **H7B-50** designation indicates a **standard rod diameter of 10 mm (0.394 inches)** with a **50 mm (1.97 inches) rod length**, providing a balanced stroke-to-rod ratio for smooth operation and reduced wear. Constructed from high-quality materials, including a **galvanized steel body** for corrosion resistance and a **chrome-plated rod** to enhance durability and reduce friction, this cylinder is built to withstand frequent cycling and harsh environments. The **round body design** offers a sleek, space-efficient profile, making it suitable for installations where compactness is a priority without compromising performance. Additionally, the cylinder incorporates **SMC s advanced sealing technology**, featuring high-performance elastomers that ensure minimal air leakage, consistent force output, and extended service life even under fluctuating load conditions.

For enhanced reliability, the **CDM2B20-250-H7B-50** is equipped with **SMC s proprietary cushioning system**, which can be adjusted to dampen impact at the end of stroke, reducing noise and mechanical stress on both the cylinder and connected machinery. This feature is particularly beneficial in high-speed applications where abrupt stops could lead to operational inefficiencies or damage. The cylinder also supports **quick-connect fittings**, simplifying installation, maintenance, and disassembly, while its **standardized mounting options** ensure compatibility with a variety of frame and guide systems. Whether integrated into a CNC machine, robotic arm, or automated conveyor system, this cylinder delivers **consistent, repeatable motion** with minimal maintenance, making it an excellent choice for manufacturers seeking a balance of performance, durability, and ease of use. With SMC s reputation for precision engineering and reliability, the **CDM2B20-250-H7B-50** is a dependable workhorse for industries demanding high-performance pneumatic actuation.

### **Analysis of SMC CDM2B20-250-H7B-50 Round Body Cylinder (Double Acting, 145psi/1.0MPa)**

#### **Overview**

The **SMC CDM2B20-250-H7B-50** is a double-acting hydraulic cylinder designed for industrial applications, offering a **20mm bore (20mm ), 250mm stroke, and a working pressure of 1.0MPa (145psi)**. It features a **round body construction**, a **H7B tolerance fit**, and a **50mm rod diameter**. This cylinder is commonly used in automation, material handling, and light-duty hydraulic systems.

---

### **Pros**

1. **Reliability and Brand Reputation**

- SMC is a well-established manufacturer in hydraulic and pneumatic automation, known for durable, precision-engineered components. Their cylinders undergo rigorous quality control, reducing the risk of premature failure.

2. **Double-Acting Design**

- Provides **bidirectional force**, meaning it can extend and retract under hydraulic pressure, making it versatile for applications requiring controlled movement in both directions (e.g., clamping, positioning, or pushing/pulling).

3. **Compact and Round Body Construction**

- The **round body design** allows for easier integration into tight spaces or custom mounting solutions. This is advantageous in applications with limited installation room.

- The **H7B tolerance** ensures a snug fit with minimal play, improving stability and reducing vibration during operation.

4. **Standardized and Compatible**

- Fits within SMC s modular system, making it easy to pair with other SMC components (e.g., valves, pumps, and fittings). This simplifies system design and reduces compatibility issues.

- Common **1.0MPa (145psi) working pressure** aligns with many standard hydraulic systems, avoiding the need for pressure adjustments.

5. **Lightweight and Cost-Effective**

- Compared to larger or more heavy-duty cylinders, this model is relatively lightweight, which can reduce installation and operational costs (e.g., lower energy consumption for movement).

- As a mid-range cylinder, it offers a balance between performance and affordability for light to medium-duty tasks.

6. **Maintenance-Friendly**

- SMC cylinders are designed for easy maintenance, with accessible seals and ports for lubrication or replacement. This extends the cylinder s lifespan with minimal downtime.

7. **Precision Engineering**

- The **20mm bore** and **50mm rod** provide a good balance of force and stroke length for applications requiring moderate power. The cylinder s internal components (e.g., piston seals, rod guides) are designed to minimize friction and wear.

8. **Safety Features**

- Double-acting cylinders inherently provide **controlled retraction**, reducing the risk of sudden movements that could cause accidents. This is safer than single-acting cylinders relying on springs or gravity.

---

### **Cons**

1. **Limited Force Output**

- With a **20mm bore and 1.0MPa pressure**, the maximum force generated is relatively low ( 314N of extension force, assuming 100% efficiency). This may be insufficient for **heavy-duty lifting, high-force applications, or tasks requiring significant resistance**.

- Example: Moving heavy loads (e.g., >50kg) or overcoming high friction may require a larger cylinder (e.g., 32mm or 40mm bore).

2. **Stroke Length Constraints**

- The **250mm stroke** is adequate for many applications but may be too short for tasks requiring longer linear movement (e.g., large-scale material handling or extended positioning).

- For longer strokes, a cylinder with a **greater stroke length (e.g., 500mm or 1m)** would be necessary.

3. **Pressure Limitations**

- While 1.0MPa is standard for many systems, some applications (e.g., high-pressure hydraulic systems or those requiring burst resistance) may need cylinders rated for **higher pressures (e.g., 2.5MPa or 3.5MPa)**.

- Operating at the maximum pressure continuously can accelerate wear on seals and internal components.

4. **Environmental Sensitivity**

- Like all hydraulic cylinders, this model is vulnerable to **contamination** (e.g., dirt, moisture, or debris in the hydraulic fluid). Poor fluid quality can lead to **seal failure, corrosion, or reduced performance**.

- If used in **harsh environments** (e.g., outdoor, high-temperature, or corrosive settings), additional protection (e.g., seals, coatings, or enclosures) may be required.

5. **Rod Deflection Under Load**

- The **50mm rod diameter** is relatively small, which may lead to **rod deflection** under heavy loads or off-center forces. This can affect precision in applications requiring exact positioning.

- For high-precision tasks, a **larger rod diameter or a tie-rod design** might be preferable.

6. **Limited Customization**

- Different mounting styles (e.g., clevis, trunnion, or flange mounts).

- Special coatings (e.g., corrosion-resistant or wear-resistant finishes).

- Integrated sensors or feedback mechanisms for position monitoring.

- Customization would require additional lead time and cost.

7. **Potential for Leakage**

- Over time, **seal wear** can cause internal or external leakage, especially if the hydraulic fluid is contaminated or the cylinder is overloaded. Regular maintenance is essential to mitigate this risk.

8. **Compatibility with Non-SMC Systems**

- While SMC components are highly compatible with each other, integrating this cylinder into a **non-SMC hydraulic system** may require **adapters, custom fittings, or pressure regulators**, adding complexity and cost.

---

### **Key Considerations Before Purchase**

1. **Force Requirements**

**Force (N) Pressure (Pa) Area (m )**

For this cylinder: **Area (0.02m) / 4 0.000314 m **

**Max Force 1,000,000 Pa 0.000314 m 314N**

If your load exceeds this, consider a larger cylinder (e.g., CDM2B32 or CDM2B40).

2. **Stroke Length Adequacy**

- Ensure the **250mm stroke** meets your application s requirements. If longer movement is needed, a different model (e.g., CDM2B20-500) may be necessary.

3. **Hydraulic System Compatibility**

- Verify that your **hydraulic pump and valve system** can handle the **1.0MPa pressure** and flow rate required for this cylinder. Insufficient flow can lead to slow or jerky movement.

4. **Environmental Conditions**

- Assess whether the cylinder will be exposed to **dust, moisture, or extreme temperatures**. If so, consider additional protection (e.g., seals, dust covers, or heated enclosures).

5. **Maintenance Accessibility**

- Ensure the cylinder s **mounting position** allows for easy access to ports, seals, and fittings for maintenance. Poor accessibility can increase downtime.

6. **Budget and Lead Time**

- While this cylinder is cost-effective for its class, **larger or custom cylinders** may incur higher upfront costs. Factor in **spare parts, maintenance, and potential downtime** when evaluating total cost of ownership.

---

### **Conclusion**

The **SMC CDM2B20-250-H7B-50** is a **well-suited, reliable choice** for **light to medium-duty hydraulic applications** requiring **controlled bidirectional movement, compact installation, and standard 1.0MPa operation**. Its **double-acting design, precision engineering, and compatibility with SMC s ecosystem** make it a practical option for automation, material handling, and general industrial tasks where force and stroke requirements are modest.

- **High force output** (e.g., heavy lifting or high-resistance tasks).

- **Extended stroke lengths** (e.g., >250mm).

- **Harsh or contaminated environments** without additional protection.

- **Ultra-precise positioning** (due to potential rod deflection).

For most **standard automation tasks** where the cylinder s specifications align with the application s needs, this model offers a **cost-effective, durable, and low-maintenance solution**.

---

### **Recommendation**

- Your application requires **bidirectional force** (e.g., clamping, pushing/pulling).

- The **force needed ( 314N) and stroke (250mm) match your requirements**.

- You are using a **compatible SMC hydraulic system** or can easily integrate it with standard fittings.

- The **environment is controlled** (minimal contamination, moderate temperatures).

- You prioritize **reliability, compact design, and ease of maintenance**.

- You need **higher force** Upgrade to a **larger bore** (e.g., CD

Details:

The SMC CDM2B20-250-H7B-50 Round Body Cylinder is a high-quality, double-acting cylinder designed for use with compressed air. With a maximum pressure of 145PSI 1.0MPa, this cylinder is suitable for variety industrial and business applications. Featuring a single-rod design, this cylinder from SMC is reliable and efficient, making it valuable addition to any hydraulic or pneumatic system. Please refer to the photos.

part #: cdm2b20250h7b50 prices

• $39.99-$149.98

specifications hydraulicylind:

• brand: Smc
• mpn: Cdm2b20-250-h7b-50
• part type: Cylinder
• suitable media: Compressed Air
• cylinder type: Single-rod Cylinder
• cylinder action: Double-acting
• country of origin: Japan

shipping hydraulicylind:

• type: Fixed
• class: Standard
• transit: 4-9 Days
• cost: $0.00
• service: Standard

payments hydraulicylind:

• other
• credit card: Diners-club
• wallet: Paypal

offer hydraulicylind:

• best offers: True
• quantity: 1
• started: April 12, 2026
• availability: In Stock
• sold: 0
• options: Ship-to-home

general hydraulicylind:

• Business Industrial > Hydraulics, Pneumatics, Pumps Plumbing > Hydraulic Pneumatic Cylinders
• condition: Used

returns hydraulicylind:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller
• method: Money back

seller hydraulicylind:

• # reviews: 9316
• rating: 99.5%
• city: Garfield, New Jersey

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