Airtac PSB Single Acting Compact Cylinder PSB12X25SU
The AirTAC Airtac PSB Single Acting Compact Cylinder PSB12X25SU is a single acting, push type (spring return) pen-size mini cylinder with a Ø12mm bore and 25mm 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
- Stroke25 mm
- Port sizeM5×0.8
- Acting typePush, single acting
- Rod threadM10×1.0
- ReturnSpring
About the Airtac PSB Single Acting Compact Cylinder PSB12X25SU
The AirTAC PSB12X25SU is a JIS pen-size single-acting push cylinder that extends via air pressure and retracts via an internal spring. It yields 42.9 N of net push at 0.5 MPa and 65.5 N at 0.7 MPa. The U suffix indicates a 90-degree side air inlet for flat plumbing. A single solenoid line drives the extension, simplifying tubing and lowering valving costs compared to double-acting units.
Built with a SUS304 stainless rod and barrel, this slim mini body fits tight jigs and damp environments. The internal spring ensures the rod fails safe to the retracted position on air loss, which is ideal for clamp-release or part-eject duties. It includes a fixed TPU bumper at each end to decelerate motion during the final few millimeters of travel.
Airtac PSB Single Acting Compact Cylinder PSB12X25SU Technical Specifications
| Model | Airtac PSB Single Acting Compact Cylinder PSB12X25SU |
|---|---|
| Series | PSB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 25 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 PSB12X25SU
| PSB | JIS pen-size single acting, push type (spring return) mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×25 | 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 PSB12X25SU Is Used
Part Ejector
Pushes machined aluminum parts off a lathe chuck; the spring safely pulls the rod back if compressed air drops unexpectedly.
Diverter Gate
Extends to deflect packages on a sorting line and retracts to let standard cartons pass without needing a second air line.
Clamp Release
Holds a cardboard carton stationary during sealing, then vents to retract the pin out of the way for the next cycle.
Is the Airtac PSB Single Acting Compact Cylinder PSB12X25SU the Right Cylinder?
This 12mm bore provides 42.9 N net push at 0.5 MPa. Stepping down to the Ø10 bore yields 29.8 N, while stepping up to the Ø16 bore provides 74.8 N. The internal spring sets a 0.2 MPa minimum pressure before motion begins. Plan for a safe working load of about 26 N (roughly 60 percent of the 0.5 MPa rating) to account for seal friction. When ordering, confirm the bore, stroke, S magnet, U side inlet, and mounting bracket.
The Ø5 mm rod is designed for coaxial thrust, so over long strokes or off-axis loads add an external guide or linear bearing to prevent side loading. The fixed TPU bumper only decelerates the last few millimeters; above mid speed with real tooling mass it bottoms out, so meter-out the exhaust or fit an external shock absorber.
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 PSB12X25SU FAQ
The net push force is 42.9 N at 0.5 MPa and 65.5 N at 0.7 MPa. Because an internal spring opposes the air stroke, a minimum pressure of 0.2 MPa is required before the rod moves. The spring also ensures the rod fails safe to the retracted position on air loss.
The S suffix means a built-in piston magnet is included for position sensing with AirTAC reed or electronic switches. This Ø12 unit uses a fixed TPU bumper at each end that decelerates the last few millimeters of travel; it is not an adjustable cushion or an external lock.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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