WENK Pneumatic SC/SU Series CB Double-ear rear cover
Dimension
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Bore | CC | CF | CE | CD | CP | CT | CR | S | T | CM | CN | CK |
| 32 | 19 | 9 | 12 | R10.5 | 16.3 | 32 | 6.5 | 45 | 33 | 39 | 32.8 | 12 | |
| 40 | 19 | 9 | 14 | R11.5 | 20.3 | 44 | 7.7 | 50 | 33 | 50 | 45 | 14 | |
| 50 | 19 | 10 | 14 | R12 | 20.3 | 52 | 7 | 62 | 47 | 60 | 52.5 | 14 | |
| 63 | 19 | 10 | 14 | R12.5 | 20.3 | 52 | 9 | 74 | 56 | 60 | 52.5 | 14 | |
| 80 | 32 | 14 | 20 | R16.5 | 32.3 | 64 | 10.5 | 93 | 70 | 73 | 64.7 | 20 | |
| 100 | 32 | 14 | 20 | R17 | 32.3 | 64 | 11 | 112 | 84 | 73 | 64.8 | 20 | |
| 125 | 47 | 15 | 25 | R20 | 72 | 116 | 12.5 | 140 | 110 | 131 | 118 | 25 | |
| 160 | 58 | 18 | 30 | R25 | 88 | 153 | 16.5 | 180 | 145 | 165 | 155 | 30 |
SC/SU Series CB Double Clevis User Guide

Product Overview
The CB double clevis from WENK Pneumatic is a robust and stable mounting accessory designed for SC/SU series standard cylinders. Featuring a dual-ear design, this accessory provides enhanced stability and load distribution compared to single clevis alternatives, making it ideal for applications requiring higher precision and reduced lateral loads.
Available in sizes ranging from 32mm to 160mm bore diameters, the CB double clevis offers broad compatibility with various cylinder models. Constructed from high-quality aluminum alloy, this mounting accessory delivers excellent strength-to-weight ratio and corrosion resistance, ensuring reliable performance in diverse industrial environments.
The double clevis configuration allows cylinders to swing within a limited angle range while maintaining optimal alignment, accommodating applications with slight misalignment. Its sturdy structure with dual pivot points and multiple mounting holes ensures secure attachment and easy installation, making it suitable for automated production lines, material handling systems, and precision machinery.
By distributing loads evenly across two pivot points, the CB double clevis effectively reduces stress on cylinder rods, extending the service life of pneumatic systems. Its compact yet robust design makes it an essential component for efficient, reliable, and high-performance cylinder mounting.

Product Specifications
Basic Parameters
- Model: CB Double Clevis
- Applicable Series: SC/SU series standard cylinders
- Applicable Bore Sizes: 32mm, 40mm, 50mm, 63mm, 80mm, 100mm, 125mm, 160mm
- Material: Aluminum alloy
- Surface Treatment: Anodized
- Swing Angle: ±5° (depending on specific application and load)
- Maximum Allowable Lateral Load: Within 1/20 of the cylinder's theoretical output force
- Operating Temperature Range: -5~70°C
- Mounting Method: Bolt fixing
- Connection Method: Dual pin connection

Installation Steps
-
Pre-installation Preparation
- Verify that the CB double clevis model matches the cylinder specifications
- Inspect the product for any external damage
- Clean the mounting surface, ensuring no impurities or burrs
- Prepare necessary installation tools and accessories (bolts, nuts, washers, etc.)
- Prepare appropriate pins and cotter pins
-
Mounting Position Selection
- Determine the double clevis mounting position based on cylinder movement requirements
- Ensure no obstacles within the swing range
- Reserve sufficient space for cylinder swinging
- Ensure the mounting surface has sufficient strength to withstand the load
-
Secure Installation
- Place the CB double clevis at the predetermined mounting position
- Fix the double clevis to the mounting surface using bolts
- Ensure secure installation without looseness
- Check that the double clevis is perpendicular to the mounting surface
-
Cylinder Connection
- Align the cylinder rear end cover with the double clevis
- Insert the pins through the pivot holes of the double clevis and cylinder end cover
- Secure the pins using cotter pins or nuts
- Check that the cylinder can swing freely without jamming
-
Adjustment and Testing
- Adjust the cylinder position to ensure the swing angle meets requirements
- Connect the air supply and test cylinder operation
- Check for smooth swinging and abnormal noise
- Verify proper cylinder movement throughout the entire stroke range
Pre-installation Preparation
- Verify that the CB double clevis model matches the cylinder specifications
- Inspect the product for any external damage
- Clean the mounting surface, ensuring no impurities or burrs
- Prepare necessary installation tools and accessories (bolts, nuts, washers, etc.)
- Prepare appropriate pins and cotter pins
Mounting Position Selection
- Determine the double clevis mounting position based on cylinder movement requirements
- Ensure no obstacles within the swing range
- Reserve sufficient space for cylinder swinging
- Ensure the mounting surface has sufficient strength to withstand the load
Secure Installation
- Place the CB double clevis at the predetermined mounting position
- Fix the double clevis to the mounting surface using bolts
- Ensure secure installation without looseness
- Check that the double clevis is perpendicular to the mounting surface
Cylinder Connection
- Align the cylinder rear end cover with the double clevis
- Insert the pins through the pivot holes of the double clevis and cylinder end cover
- Secure the pins using cotter pins or nuts
- Check that the cylinder can swing freely without jamming
Adjustment and Testing
- Adjust the cylinder position to ensure the swing angle meets requirements
- Connect the air supply and test cylinder operation
- Check for smooth swinging and abnormal noise
- Verify proper cylinder movement throughout the entire stroke range

Operation Guide
-
Pre-start Check
- Verify that the double clevis is securely installed without looseness
- Check that the pin connections are safe and reliable
- Ensure no obstacles within the swing range
- Verify correct matching between the cylinder and double clevis
-
Basic Operation
- Cylinder Extension Action:
- Compressed air enters from the cylinder's rodless cavity
- The piston rod extends, driving the load movement
- The double clevis allows the cylinder to swing slightly during movement
- Cylinder Retraction Action:
- Compressed air enters from the cylinder's rod cavity
- The piston rod retracts, driving the load back
- The double clevis allows the cylinder to swing slightly during movement
-
Load Limitations
- Ensure the load does not exceed the double clevis's maximum load capacity
- Lateral loads should be controlled within 1/20 of the cylinder's theoretical output force
- Avoid exceeding the allowable swing angle range
- Adjust the working pressure according to actual application requirements
-
Swing Angle Control
- The swing angle is generally controlled within ±5°
- Avoid excessive swing angles to prevent increased lateral loads on the cylinder rod
- Adjust the swing angle according to specific application requirements
- The swing angle can be limited by adjusting the mounting position
-
Operational Precautions
- Avoid sudden loading or unloading during cylinder movement
- Do not exceed the double clevis's maximum allowable load
- Regularly check for smooth swinging
- Avoid excessive inertial forces caused by high-speed cylinder movement
Pre-start Check
- Verify that the double clevis is securely installed without looseness
- Check that the pin connections are safe and reliable
- Ensure no obstacles within the swing range
- Verify correct matching between the cylinder and double clevis
Basic Operation
- Cylinder Extension Action:
- Compressed air enters from the cylinder's rodless cavity
- The piston rod extends, driving the load movement
- The double clevis allows the cylinder to swing slightly during movement
- Cylinder Retraction Action:
- Compressed air enters from the cylinder's rod cavity
- The piston rod retracts, driving the load back
- The double clevis allows the cylinder to swing slightly during movement
Load Limitations
- Ensure the load does not exceed the double clevis's maximum load capacity
- Lateral loads should be controlled within 1/20 of the cylinder's theoretical output force
- Avoid exceeding the allowable swing angle range
- Adjust the working pressure according to actual application requirements
Swing Angle Control
- The swing angle is generally controlled within ±5°
- Avoid excessive swing angles to prevent increased lateral loads on the cylinder rod
- Adjust the swing angle according to specific application requirements
- The swing angle can be limited by adjusting the mounting position
Operational Precautions
- Avoid sudden loading or unloading during cylinder movement
- Do not exceed the double clevis's maximum allowable load
- Regularly check for smooth swinging
- Avoid excessive inertial forces caused by high-speed cylinder movement

Maintenance
-
Daily Inspection
- Check that the double clevis is securely installed
- Verify that the pin connections are safe and reliable
- Check for smooth swinging and abnormal noise
- Confirm no loose or damaged components
-
Regular Maintenance
- Every 3 months:
- Clean the double clevis surface
- Check for loose mounting bolts
- Lubricate the pin connections
- Every 6 months:
- Check for double clevis deformation or damage
- Inspect pin and cotter pin wear
- Perform functional tests
- Annually:
- Comprehensive inspection of double clevis structural integrity
- Check for corrosion or damage on the aluminum alloy surface
- Replace worn components if necessary
-
Lubrication
- Regularly add an appropriate amount of lubricating oil to the pin connections
- Use the recommended lubricant type (e.g., lithium-based grease)
- Avoid using excessive lubricant to prevent dust accumulation
- Keep lubrication points clean
-
Storage and Handling
- Store in a dry, clean environment away from direct sunlight
- Avoid storage temperatures below -5°C or above 70°C
- Avoid severe impact and vibration during handling
- Inspect the double clevis for damage before installation
Daily Inspection
- Check that the double clevis is securely installed
- Verify that the pin connections are safe and reliable
- Check for smooth swinging and abnormal noise
- Confirm no loose or damaged components
Regular Maintenance
- Every 3 months:
- Clean the double clevis surface
- Check for loose mounting bolts
- Lubricate the pin connections
- Every 6 months:
- Check for double clevis deformation or damage
- Inspect pin and cotter pin wear
- Perform functional tests
- Annually:
- Comprehensive inspection of double clevis structural integrity
- Check for corrosion or damage on the aluminum alloy surface
- Replace worn components if necessary
Lubrication
- Regularly add an appropriate amount of lubricating oil to the pin connections
- Use the recommended lubricant type (e.g., lithium-based grease)
- Avoid using excessive lubricant to prevent dust accumulation
- Keep lubrication points clean
Storage and Handling
- Store in a dry, clean environment away from direct sunlight
- Avoid storage temperatures below -5°C or above 70°C
- Avoid severe impact and vibration during handling
- Inspect the double clevis for damage before installation

Safety Precautions
- Read this user guide carefully before operation
- Ensure the double clevis model matches the cylinder specifications
- Cut off the air supply before installation and maintenance
- Avoid use in environments with corrosive gases, dust, or high temperatures unless specially treated
- Do not exceed the double clevis's rated load and swing angle
- Regularly inspect equipment condition to identify and address potential issues promptly
- Immediately stop use and inspect if abnormal conditions are found
- Avoid placing fingers or other body parts within the cylinder's movement range
- Use appropriate safety protection devices, such as protective covers or safety light curtains
- Release pressure from the cylinder before disassembly
- Do not disassemble or modify the double clevis to avoid affecting safety performance
- Use original accessories when replacing components













