Description

CDU Series: Integrated Free-Mount Pneumatic Cylinder

Precision Linear Motion with Multi-Directional Installation Flexibility

The CDU Series is a space-saving, double-acting single-rod cylinder designed for versatile integration into compact automation systems. Its rectangular “free-mount” body allows for direct installation from multiple faces without the need for additional brackets, ensuring a high degree of mounting rigidity and spatial efficiency.

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Technical Specifications

Engineered for high-repetition accuracy, the CDU series maintains stable performance across a broad range of operating conditions.

Feature	Specification Details	Source
Bore Sizes (mm)	ø6, ø10, ø16, ø20, ø25
Action	Double Acting, Single Rod
Fluid	Air
Proof Pressure	1.05 MPa
Max. Operating Pressure	0.7 MPa
Piston Speed	50 to 400 mm/s
Cushion	Rubber Bumper
Lubrication	Non-lube (Factory pre-lubricated)
Stroke Tolerance	+1.0 / 0 mm
Port Size	M5 x 0.8

Operating Thresholds

Minimum Operating Pressure: 0.12 MPa (ø6); 0.06 MPa (ø10, ø16); 0.05 MPa (ø20, ø25).
Ambient & Fluid Temperature:
- Without Auto Switch: -10°C to 70°C (no freezing).
- With Auto Switch: -10°C to 60°C (no condensation).

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Standard Stroke Availability (mm)

Available in standardized increments to suit diverse application requirements:

Bore Size	Standard Strokes (mm)
ø6, ø10	5, 10, 15, 20, 25, 30
ø16, ø20, ø25	5, 10, 15, 20, 25, 30, 40, 50

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Specialized Variations for Controlled Environments

The series includes specific models optimized for cleanroom and sensitive manufacturing sectors.

Relief Type (Series 10- & 21-): Designed for low particle generation; classified as Grade 2 (Series 10) or Grade 3 (Series 21).
Vacuum Suction Type (Series 11- & 22-): Achieves Grade 1 cleanliness through integrated vacuum suction ports.
Material Purity (Series 21- & 22-): Classified as Copper, Fluorine, and Silicon-free, utilizing Lithium soap base grease for compatibility with sensitive electronic and battery production processes.

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Sensing and Automation Integration

All units are equipped with a built-in magnet for position sensing. The body features longitudinal slots for flush-mounting the following auto switch types:

Reed Switch (D-A93): 24 VDC load voltage; 5 to 40mA load current.
Solid State Switch (D-M9B / D-M9N): 2-wire or 3-wire (NPN) types; 24 VDC (10 to 28 VDC) load voltage.

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Installation Torque Guidelines

To ensure structural integrity and prevent damage to the threaded mounting holes, the following tightening torques must be observed:

Bore Size	Hex Bolt Size	Appropriate Torque (N·m)
ø6, ø10	M3	1.08 ±10%
ø16	M4	2.45 ±10%
ø20, ø25	M5	5.10 ±10%

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Engineering Precautions

Auto Switch Adjustment: Mounting positions should be fine-tuned during actual operation to ensure reliable stroke-end detection, particularly for short-stroke applications (5mm to 10mm).
Environmental Stability: For cleanroom vacuum models, refer to reference suction flow rates (e.g., 6 to 12 l/min ANR) to maintain particle containment.
Filtration: Clean air must be used to protect internal seals and prevent contamination in relief-type models