What is Cylinder Bore? How to Choose the Right Size

What is Cylinder Bore?

Cylinder bore refers to the diameter of the piston inside a pneumatic cylinder

. It is one of the most important parameters because it directly affects:

1. Cylinder force
2. Overall cylinder size
3. Air consumption
4. Load capacity

Examples:

1. 32mm bore
2. 50mm bore
3. 63mm bore
4. 100mm bore

👉 The larger the bore, the greater the output force.

How Does Bore Affect a Pneumatic Cylinder?

Cylinder Force

A larger bore means:

1. Larger piston area
2. Higher pushing force

For example:

1. Bore 32 → light-duty applications
2. Bore 63 → medium-duty applications
3. Bore 100 → heavy-duty applications

Air Consumption

Larger bore cylinders:

1. Consume more compressed air
2. Require larger air compressors

👉 This is one of the most common mistakes when selecting a pneumatic cylinder.

Size and Weight

Larger bore cylinders are:

1. Bigger
2. Heavier
3. More demanding in installation space

How to Calculate Cylinder Force from Bore

Cylinder force mainly depends on:

1. Air pressure
2. Piston area

Basic formula:

F=P×AF = P \times AF=P×A

Where:

1. F = force
2. P = pressure
3. A = piston area

👉 A larger bore creates a larger piston area, resulting in higher force output.

Common Pneumatic Cylinder Bore Sizes

Common bore sizes used in industrial applications include:

How to Choose the Right Bore Size

Choose Based on Load

Choose Based on Application

Packaging Machines

1. Usually use small to medium bore cylinders

Conveyor Systems

1. Commonly use 50–63 bore cylinders

Heavy Clamping or Pressing

1. Larger bore cylinders are recommended

👉 The key point:

1. Choosing a bore too small → insufficient force
2. Choosing a bore too large → unnecessary air consumption

Common Mistakes When Choosing Cylinder Bore

Choosing a Bore That Is Too Small

1. Insufficient force
2. Weak operation
3. Reduced lifespan

Choosing a Bore That Is Too Large

1. Excessive air consumption
2. Higher cost
3. Bulky system design

👉 This is why load calculation is important before selecting a cylinder.

Bore vs Stroke: What’s the Difference?

Many people confuse:

1. Bore
2. Stroke

However:

1. Bore = piston diameter
2. Stroke = travel distance

👉 Bore determines force

👉 Stroke determines movement distance

Conclusion

Bore is one of the most critical parameters when selecting a pneumatic cylinder. Choosing the correct bore helps:

1. Ensure sufficient force
2. Reduce air consumption
3. Improve system durability
4. Optimize operating costs

👉 If you are unsure which size to choose, consider:

1. Load requirements
2. Air pressure
3. Installation space
4. Real-world application needs