Airtac PSB Single Acting Compact Cylinder PSB12X20CB
The AirTAC Airtac PSB Single Acting Compact Cylinder PSB12X20CB is a single acting, push type (spring return) pen-size mini cylinder with a Ø12mm bore and 20mm stroke. A single air port drives the push stroke; the built-in return spring resets the rod when air is released, so only one solenoid line is needed.
- BoreØ12 mm
- Stroke20 mm
- Port sizeM5×0.8
- Acting typePush, single acting
- Rod threadM10×1.0
- ReturnSpring
About the Airtac PSB Single Acting Compact Cylinder PSB12X20CB
The AirTAC PSB12X20CB is a JIS pen-size single-acting push cylinder with a 12mm bore and 20mm stroke. Air entering the single M5x0.8 port extends the Ø5 mm rod, while an internal spring retracts it upon exhaust. This fail-safe design ensures the rod returns home if air pressure drops. It delivers 42.9 N of net push at 0.5 MPa and 65.5 N at 0.7 MPa, with the return spring force already deducted.
Featuring a CB double clevis back cover, this unit is built for pivoting loads. The SUS304 stainless barrel and slim body fit easily into tight jigs. A fixed TPU bumper at each end decelerates the stroke, but because the rod is only Ø5 mm, you should use an external guide to prevent side loading. Plan for a safe working load of about 26 N, which is roughly 60 percent of the 0.5 MPa rating.
Airtac PSB Single Acting Compact Cylinder PSB12X20CB Technical Specifications
| Model | Airtac PSB Single Acting Compact Cylinder PSB12X20CB |
|---|---|
| Series | PSB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 20 mm |
| Acting type | Single acting, push type (spring return) |
| Port size | M5×0.8 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.2 – 0.7 MPa |
| Proof pressure | 1.2 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 800 mm/s |
| Return | Return spring (push by air) |
| Max standard stroke | Up to 60 mm |
The spring holds the rod retracted; applying air pushes the rod out, and removing air lets the spring return it. Forces below are the NET spring-deducted values from the AirTAC thrust table. Confirm against the product label before installation.
Net Push Force (Ø12mm)
| Pressure | Net push force |
|---|---|
| 0.5 MPa | 42.9 N |
| 0.7 MPa (max) | 65.5 N |
These are the usable push forces after the return spring is subtracted, taken directly from the AirTAC single-acting thrust table. Minimum operating pressure is set by the spring, so this model needs at least the lower pressure shown to move.
Model Code: Airtac PSB Single Acting Compact Cylinder PSB12X20CB
| PSB | JIS pen-size single acting, push type (spring return) mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×20 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| R / U / CB | Back cover: R axial inlet, U 90° side inlet, CB double clevis (bore-dependent). |
Mounting accessories: LB, FA, CJ. Related PB-family variants: PB (double acting), PTB (single-acting pull), PBD (double rod), PBR (front-mount).
Where the Airtac PSB Single Acting Compact Cylinder PSB12X20CB Is Used
Pivoting Part Ejector
Uses the CB double clevis to swing rejected parts off a conveyor belt, relying on the spring to safely retract the plunger when air stops.
Light Duty Clamp
Applies 42.9 N of net push at 0.5 MPa to hold thin material in a machining jig, releasing instantly on air loss.
Gate Diverter
Pushes a lightweight sorting gate into position on packaging lines, with the fail-safe retract preventing jams during power loss.
Is the Airtac PSB Single Acting Compact Cylinder PSB12X20CB the Right Cylinder?
Choose this 12mm bore model when your pivot mechanism needs a compact push force of 42.9 N at 0.5 MPa. If you require less force, the Ø10 variant provides 29.8 N; for heavier work, the Ø16 offers 74.8 N. The internal spring sets a 0.2 MPa minimum pressure before motion begins. Confirm your ordering essentials: 12mm bore, 20mm stroke, no magnet, CB double clevis back cover, and any mounting brackets.
Quick checklist
- ✓ Net push force at your working pressure
- ✓ Only one air line / solenoid needed
- ✓ Fail-safe retract on air loss
- ✓ Magnet (S) for sensors?
- ✓ Stroke ≤ 60 mm (single-acting limit)
- ✓ Keep the load coaxial — avoid side load
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.2 – 0.7 MPa operating pressure.
- check Allow for spring force in the stroke direction.
- check Do not add an external return mechanism.
- check Keep the load coaxial; avoid side load on the thin rod.
- check Do not dismantle the front or back cover.
Airtac PSB Single Acting Compact Cylinder PSB12X20CB FAQ
The net push force is 42.9 N at 0.5 MPa and 65.5 N at 0.7 MPa (maximum). Because the internal return spring opposes the air stroke, a minimum of 0.2 MPa is required before the rod moves. The spring automatically retracts the rod if air pressure is lost.
This 12mm bore model uses a fixed TPU bumper at each end to decelerate the stroke over the last few millimeters. It is not adjustable. At higher speeds with real tooling mass, you should meter-out the exhaust or add an external shock absorber to prevent the bumper from bottoming out.
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Standard models usually ship in 3-4 days.
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Related AirTAC PSB Pen-Size Cylinders
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