OEM Factory Direct CJPB Series Needle Pin Cylinder Manufacturer Miniature Single-Acting Pneumatic Micro Cylinder Compatible With SMC

Product Detailed Description：

Engineered for maximum space efficiency, the CJPB Series Pin Cylinder offers a streamlined solution for micro-linear motion. The cylinder body is crafted from high-quality brass (or aluminum) with a precision-ground stainless steel piston rod, ensuring a low-friction stroke and long service life.

Its unique "Pin" design allows the cylinder to be embedded directly into machine blocks or mounted through panels using the included hex nut, significantly reducing the overall footprint of your pneumatic system. This single-acting spring return model requires only one air port, simplifying your tubing and valve configurations.

Application Industries:

Watch & Precision Instrument Making,Optical & Lens Manufacturing,Printing & Coding,Food & Beverage (Small Machinery),Toy & Model Assembly,Aerospace & Defense Component Assembly,Jewelry & Accessories

Product Feature：

• Micro-Miniature Design: One of the smallest industrial cylinders available, perfect for high-density machine layouts.
• Integrated Panel Mounting: The fully threaded body allows for direct mounting into panels or custom-machined blocks.
• Single-Acting Spring Return: Simplifies control logic and piping by using air to extend and an internal spring to retract.
• High-Quality Materials: Stainless steel piston rod prevents corrosion and ensures smooth operation in high-frequency cycles.
• Easy Installation: Comes with mounting nuts for quick and secure setup.
• Optional Non-Rotating Versions: Available with specialized rod designs for applications requiring fixed orientation.

Specification：

Customization Options

Product Advantages

• Ultra-miniature footprint — fits where no other cylinder can. The CJPB 6 mm bore cylinder has a body diameter of just 10 mm — roughly the diameter of a pencil. Its overall length at 5 mm stroke is under 35 mm. For high-density machine layouts where multiple actuators must fit within a palm-sized space — SMT pick-and-place heads, micro-valve manifolds, lab-on-a-chip instruments — the CJPB is the only industrial-grade pneumatic option.

• Threaded body with panel mounting — instant integration. The entire cylinder body is precision-threaded from front to rear. Installation requires only a drilled and tapped hole in the mounting panel, plus the supplied hex lock nut. No brackets, no flanges, no additional hardware. The cylinder sits flush or near-flush with the panel surface — no protrusion to interfere with adjacent mechanisms. For multi-cylinder arrays (e.g., 8 or 16 CJPB units in a single test fixture), the threaded body design allows cylinders to be packed at center-to-center distances as tight as 12 mm.

• Single-acting spring return — half the plumbing, half the control cost. With only one air port, the CJPB requires a simple 3/2-way solenoid valve instead of the 5/2-way valve needed for double-acting cylinders. This halves the tubing, reduces the valve manifold size, and simplifies the electrical control scheme. The internal spring provides reliable retraction without a second air circuit — no need to route return air lines through tight machine frames.

• Stainless steel piston rod — corrosion resistance without plating. The piston rod is ground from stainless steel — not chrome-plated carbon steel. This eliminates the risk of chrome peeling, a common failure mode in high-cycle micro-cylinders where the thin chrome layer delaminates from the small-diameter rod. The solid stainless construction provides inherent corrosion resistance through the full rod cross-section, not just the surface.

• Brass body option — natural lubricity. For applications requiring extra-smooth operation or operating in mildly corrosive atmospheres where aluminum would oxidize, the CJPB brass body variant offers natural self-lubricating properties and superior chemical resistance. The brass-to-stainless material pair provides the lowest possible static friction for a metal-body cylinder in this size class.

• High cycle rate — engineered for speed. The CJPB's lightweight internal assembly (moving mass typically under 5 grams) combined with the short stroke (as little as 5 mm) enables cycle rates exceeding 15 Hz. This makes it the actuator of choice for high-speed sorting, counting, and ejection stations where every millisecond of cycle time matters. The spring return is tuned to match the piston's natural frequency, ensuring clean, bounce-free retraction.

• SMC CJPB 1:1 dimensional replacement. Body thread, overall length, rod diameter, port size, and panel nut specifications are manufactured to identical dimensions as SMC CJPB. Drop-in replacement — unthread the old cylinder, thread in the AIRWORK equivalent, reconnect the single air line, and the machine is back in production.

Application：

• Electronics & Semiconductor Manufacturing：

In the world of SMT (Surface Mount Technology), space is at a premium. The CJPB cylinder is widely used as a precision ejector in tape-and-reel feeders to push microscopic components into position. Its miniature profile allows it to be integrated into high-density test fixtures, where it acts as a micro-probe to verify PCB connectivity or as a delicate locator to align flexible circuits before laser welding. The short stroke ensures high-speed cycles, keeping throughput at maximum levels.

• Medical & Laboratory Automation：

Precision and cleanliness are paramount in medical devices. The CJPB series is ideal for automated liquid handling systems, such as micro-pipettes and blood analyzers, where it controls the opening and closing of micro-valves or the clamping of test tubes. Because it can be panel-mounted, it is often embedded within the chassis of diagnostic instruments to operate small-scale mechanical gates or to trigger sample ejection without adding bulk to the machine’s footprint.

• Textile & High-Speed Sewing Machinery ：

For industrial sewing machines, the CJPB cylinder is the go-to component for automatic thread cutting and tensioning. Its tiny diameter allows it to be placed directly beneath the needle plate or inside the sewing head to drive the trimmer mechanism. The single-acting spring return design ensures that the thread is cut with a crisp, repeatable action at thousands of cycles per hour, significantly reducing manual labor and increasing seam consistency.

Installation and Usage：

• Panel Mounting: Drill a hole matching the body thread size (e.g., M10 for 6mm bore). Insert the cylinder and secure it using the provided hex nut.
• Piping: Connect a 4mm or 6mm tube to the single air port. Use a 3-way solenoid valve (3/2-way) to control the extension and exhaustion.
• Lubrication: The cylinder is pre-lubricated. If an airline lubricator is used, use ISO VG32 turbine oil.
• Side Load Prevention: Avoid applying lateral loads to the micro-rod. Ensure the load is aligned axially to prevent seal wear or rod bending.
• Spring Tension: Note that the retraction force is provided by an internal spring; ensure your load does not exceed the spring’s return force (refer to catalog data).

FAQ

Q1. Is this CJPB cylinder compatible with SMC brand products?

A1.Yes, our CJPB series is manufactured to the exact same dimensional and performance standards as the SMC CJPB series. It is a 1:1 drop-in replacement.

Q2.Can I get a double-acting version of this pin cylinder?

A2.The standard CJPB is single-acting (spring return) to keep the size minimal. If you require double-acting functionality in a small size, we recommend looking at our CJ2 or CJ1 series micro-cylinders.

Q3.What is the benefit of the threaded body design?

A3. The threaded body allows for "Panel Mounting." You can screw the cylinder directly into a plate or machine frame, which saves space compared to traditional foot or flange mounts.

Q4.Can the rod be customized with a different thread or length?

A4. We offer customization for bulk orders, including special rod end shapes or extended strokes. Please contact our sales team with your specific drawing.

Q5. Is it possible to mount a magnetic sensor on the CJPB series?

A5. Due to its ultra-miniature design, the standard CJPB does not support integrated magnetic sensors. For position sensing, we recommend using external proximity or optical sensors.

Q6. What happens if the air pressure is too low?

A6. The cylinder requires a minimum pressure (typically 0.2 MPa) to overcome the internal spring resistance. If the pressure is too low, the rod may not extend fully or smoothly.

Q7.Is the CJPB suitable for high-speed operations?

A7.Yes, the lightweight piston and short stroke allow for very high cycle rates, making it excellent for high-speed sorting and assembly tasks.

Q8. What is the expected lifespan of the internal spring?

A8. Our springs are made from high-fatigue-resistant alloy steel, designed for millions of cycles. However, ensure the environment is within the rated temperature range to maintain spring tension.

Q9.CJPB vs. 24N2A or MA — how to choose?

A9.CJPB: single-acting, threaded body, max 15 mm bore / 30 mm stroke, smallest footprint. 24N2A/MA: double-acting, larger bore (16–25 mm), longer stroke, nose mount, magnetic sensor support. Choose CJPB when space is the absolute priority.

Factory Advantages and Certifications

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Certification