Description

CDU Series: High-Performance Free Mount Cylinder

Precision Linear Motion with Versatile Mounting Configurations

The CDU Series is an ultra-compact, double-acting single-rod pneumatic cylinder designed for maximum installation flexibility in space-constrained automation environments. Its unique “free mount” body allows for direct installation from multiple directions without the need for additional brackets. This series is available in specialized configurations, including low-particle generation and copper/fluorine-free models, making it ideal for cleanroom and sensitive manufacturing applications.

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Technical Specifications

The CDU series is engineered for high-repetition accuracy and durability under standard and cleanroom conditions.

Feature	Specification Details	Source
Bore Sizes (mm)	6, 10, 16, 20, 25
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

Minimum Operating Pressure by Bore Size

ø6: 0.12 MPa
ø10, ø16: 0.06 MPa
ø20, ø25: 0.05 MPa

Operating Temperature Range

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

Bore Size (mm)	Standard Strokes (mm)	Source
6, 10	5, 10, 15, 20, 25, 30
16	5, 10, 15, 20, 25, 30, 40, 50
20, 25	5, 10, 15, 20, 25, 30, 40, 50

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Clean Room and Specialized Models

The CDU series offers four distinct variations for controlled environments, focusing on low particle generation and material purity.

Relief Type (Series 10- & 21-): Features specific grease types to meet Grade 2 (Series 10) or Grade 3 (Series 21) particle generation standards.
Vacuum Suction Type (Series 11- & 22-): Designed for Grade 1 cleanroom environments, utilizing a suction flow rate to eliminate internal particles.
Material Standards: Series 21 and 22 are classified as Copper, Fluorine, and Silicon-free, ensuring compatibility with sensitive electronics and battery manufacturing.

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Auto Switch Integration

All CDU cylinders are equipped with a built-in magnet as standard for position sensing. The body features longitudinal grooves for flush mounting of the following switch types:

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

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Installation and Maintenance Guidelines

Proper Tightening Torque

To ensure the integrity of the free-mount body, bolts must be tightened according to the following specifications:

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

Operational Precautions

Condensation: When using auto switches, ensure the environment remains dry to prevent condensation, which can lead to switch malfunction.
Mounting Position: For stroke end detection, adjust the auto switch position confirm accurate operation, noting that switch dimensions for the D-A93 type vary slightly from solid-state models.
Cleanliness: For vacuum suction models, refer to the suction flow rate reference values (e.g., 6 to 12 l/min ANR) to maintain proper particle containment