CUJS12-10DM: SMC CUJ Series Compact Free Mounting Air Cylinder (Bore 12 mm, Stroke 10 mm, Double-Acting, Rod End External Thread, with Built-in Magnet)

2026-01-22 By xyj2024 0

The CUJS12-10DM is a model from SMC Corporation Japan’s CUJ Series of compact, free mounting air cylinders. It features a bore of 12 mm, a stroke of 10 mm, double-acting operation, a rod end with external thread, and a built-in magnet. It is suitable for short-stroke clamping, pushing, positioning, and other actions in space-constrained industrial automation equipment, representing a typical example of a compact pneumatic actuator.

I. Model Number Interpretation (According to SMC CUJ Series Naming Rules)

CUJ: CUJ Series compact free mounting air cylinder, bore sizes 4–20 mm, free mounting structure.
S: Mounting direction code. S indicates axial mounting (Basic mounting type).
12: Bore size code. 12 indicates a 12 mm bore.
10: Stroke code. 10 indicates a 10 mm stroke.
D: Action type code. D indicates double-acting (rod extension and retraction are both air-driven).
M: Rod end thread form code. M indicates rod end external thread.

II. Main Technical Specifications

Parameter	Specification	Description
Series	CUJ	Compact free mounting cylinder series, bore 4–20 mm, free mounting structure.
Bore Size	12 mm	Cylinder inner diameter, determining output force.
Stroke	10 mm	Distance the piston rod travels, suitable for short-stroke applications.
Action Type	Double-Acting	Piston rod extension and retraction are both driven by compressed air.
Mounting Style	Axial Mounting (Basic)	Fixed via mounting holes on the cylinder body, suitable for various mounting situations.
Cushion Type	Cushion	Both ends feature rubber bumpers to reduce end impact.
Built-in Magnet	Yes	For magnetic switch detection of piston position, facilitating electrical control.
Rod End Thread Form	Rod End External Thread	Facilitates connection of load or accessories.
Applicable Fluid	Air	Working medium, suitable for pneumatic systems.
Operating Pressure Range	0.07–0.7 MPa	Recommended working pressure range for proper cylinder operation.
Proof Pressure	1.05 MPa	Pressure test rating for verifying cylinder pressure resistance.
Fluid Temperature Range	-10 to 60 °C	Fluid temperature range for proper seal function.
Ambient Temperature Range	-10 to 60 °C	Environmental temperature range for proper cylinder operation.
Lubrication Requirement	Non-lubricated	Does not require oil mist lubrication, simplifying the pneumatic circuit.
Piston Speed Range	50–500 mm/s	Recommended piston speed range for optimal cylinder life and performance.
Port Size	M3×0.5	Air port thread specification for piping connection.
Piston Rod Diameter	6 mm	Piston rod diameter, determining anti-bending capability and output force.
Theoretical Thrust IN (at 0.3 MPa)	25 N	Theoretical thrust at 0.3 MPa supply pressure.
Theoretical Thrust IN (at 0.5 MPa)	42 N	Theoretical thrust at 0.5 MPa supply pressure.

III. Structure and Working Principle

1. Structural Composition

The CUJS12-10DM employs a compact, free mounting cylinder structure, primarily consisting of:

Cylinder Body: Aluminum alloy, surface anodized for corrosion and wear resistance. Features mounting holes for versatile installation.
Piston: Aluminum alloy, includes piston seals and wear rings for improved guidance and durability.
Piston Rod: Stainless steel, hard chrome-plated for corrosion and wear resistance. Rod end features external threads for easy load connection.
End Covers: Aluminum alloy, incorporate rubber bumpers and seals. The rod end cover includes a rod bushing for improved guidance accuracy.
Bumpers: Rubber bumpers on both ends absorb impact to reduce end shock.
Seals: Made of materials like polyurethane, ensuring reliable sealing performance.
Mounting Holes: Holes on the cylinder body facilitate axial mounting in various applications.

2. Working Principle

The CUJS12-10DM operates as a compact double-acting cylinder:

Extension: Compressed air enters the blind side (rodless side), pushing the piston forward, extending the rod and producing thrust.
Retraction: Compressed air enters the rod side, pushing the piston backward, retracting the rod and producing pull force.
Cushioning: As the piston approaches the end of its stroke, the rubber bumper absorbs the impact, reducing shock.

IV. Features

Compact Size: 12 mm bore and 10 mm stroke provide a very compact design for space-limited applications.
Free Mounting Type: Mounting holes on the cylinder body allow for versatile axial mounting in various configurations.
Double-Acting: Provides reliable bi-directional movement (extension and retraction) driven by compressed air.
Bumper Cushioning: Rubber bumpers on both ends reduce end-impact, extending service life.
Built-in Magnet: Allows for easy installation of magnetic switches for position detection and electrical control.
Rod End External Thread: Facilitates connection of loads or accessories, improving installation convenience.
Non-lubricated Design: Eliminates the need for an air line lubricator, suitable for clean environments and simpler circuits.

V. Typical Application Scenarios

Compact Fixtures: Clamping and positioning mechanisms in welding/assembly fixtures for rapid, small-scale workpiece handling.
Material Handling: Pushing, lifting, and stopping actions for lightweight workpieces on conveyors in short-stroke applications.
Testing Equipment: Short-stroke actuation for positioning mechanisms and test fixtures in multi-station testing cycles.
Packaging Machinery: Clamping and positioning units in small sealing machines, labelers, adapting to very compact equipment layouts.
Automated Production Lines: Clamping, pushing, lifting actions on automated lines for lightweight, short-stroke applications.

VI. Installation and Usage Precautions

Mounting Location: Mount the cylinder on a sufficiently rigid base to avoid vibration and shock. Mounting surfaces should be machined for mounting screws to ensure secure installation. For applications involving impact from stoppers, etc., ensure thread engagement depth is at least 2 times the screw diameter.
Alignment & Load: When connecting the piston rod to a load, ensure good alignment to avoid eccentric or side loads. Side loads on the piston rod are limited. Exceeding permissible values can cause abnormal seal wear, seizure between cylinder and piston, or abnormal bushing wear. Ensure loads remain within catalog specified limits.
Speed Control: Install speed control valves (one-way flow control valves) at the cylinder’s inlet and/or outlet ports to achieve smooth speed adjustment. Recommended piston speed is 50–500 mm/s; avoid speeds outside this range to prevent reduced service life.
Air Preparation: The air supply should be filtered (5 μm or finer) and dried to ensure clean, dry compressed air. Use clean air free from deteriorating compressor oil to prevent contamination.
Maintenance & Inspection: Regularly inspect air lines for leaks and the piston rod for wear. If operation is abnormal, first check air pressure, piping, and flow control valve settings. Replace seals or the cylinder if necessary.

VII. Selection and Alternative Suggestions

For different strokes, select other CUJ models, e.g., CUJS12-5DM (5 mm stroke), CUJS12-15DM (15 mm stroke), CUJS12-20DM (20 mm stroke).
For different bore sizes, consider CUJS8-10DM (8 mm bore), CUJS16-10DM (16 mm bore), CUJS20-10DM (20 mm bore).
For single-acting operation, consider models like CUJS12-10SM (single-acting, spring return).

Summary: The CUJS12-10DM is a compact and reliable small free mounting air cylinder. Its design, featuring “12 mm bore + 10 mm stroke + double-acting + bumper cushioning + built-in magnet + rod end external thread + free mounting type,” provides lightweight, short-stroke actuation for industrial automation systems. It is an ideal choice for compact applications such as small fixtures, material handling, and testing equipment.

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CUJS12-10DM: SMC CUJ Series Compact Free Mounting Air Cylinder (Bore 12 mm, Stroke 10 mm, Double-Acting, Rod End External Thread, with Built-in Magnet)

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