Airtac PSB Single Acting Compact Cylinder PSB12X20SR
The AirTAC Airtac PSB Single Acting Compact Cylinder PSB12X20SR 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 PSB12X20SR
The AirTAC PSB12X20SR 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 Ø5mm rod, while an internal spring ensures fail-safe retraction upon exhaust. You get 42.9 N of net push at 0.5 MPa and 65.5 N at 0.7 MPa, with the return spring force already subtracted from these usable figures.
This slim SUS304 stainless body integrates an S-series piston magnet for position sensing and an R axial inlet for in-line plumbing. A fixed TPU bumper cushions the stroke ends. For practical sizing, plan for a safe working load of roughly 26 N (about 60 percent of the 0.5 MPa rating) to account for friction, which equates to lifting a 2.2 kg part vertically with a sane 2:1 margin.
Airtac PSB Single Acting Compact Cylinder PSB12X20SR Technical Specifications
| Model | Airtac PSB Single Acting Compact Cylinder PSB12X20SR |
|---|---|
| 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 PSB12X20SR
| 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 PSB12X20SR Is Used
Part Ejection Arm
Pushes machined aluminum rings out of a lathe chuck; the spring-return design guarantees the ejector clears the workspace if the air supply suddenly fails.
Diverter Gate
Extends a lightweight deflector plate to route small plastic bottles on a packaging line, relying on single-line solenoid valving to simplify tubing.
Carton Flap Tucker
Folds corrugated flaps before tape sealing, using the 26 N safe working load to consistently press light cardboard without stalling.
Is the Airtac PSB Single Acting Compact Cylinder PSB12X20SR the Right Cylinder?
Comparing neighbors: the Ø10 bore yields 29.8 N at 0.5 MPa, while the Ø16 provides 74.8 N. This Ø12 hits a balanced 42.9 N at 0.5 MPa. Remember the internal spring sets a 0.2 MPa minimum pressure before motion begins, and the rod stays safely retracted if air pressure drops. The Ø5mm rod is built for coaxial thrust, so add an external linear bearing if your jig imposes side loads.
When ordering, confirm the 12mm bore, 20mm stroke, S magnet for electronic or reed switches, R axial back cover, and your preferred mounting bracket. The fixed TPU bumper only decelerates the final few millimeters, so meter-out the exhaust or add an external shock absorber when cycling heavy tooling at mid to high speeds.
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 PSB12X20SR FAQ
The net push force is 42.9 N at 0.5 MPa and 65.5 N at 0.7 MPa (maximum pressure). Because the internal return spring opposes the air stroke, a minimum of 0.2 MPa is required before the rod extends. The rod fail-safe retracts when air is exhausted.
Yes, the S suffix denotes a built-in piston magnet compatible with both reed and solid-state electronic switches. The cylinder uses a fixed TPU bumper at each end that decelerates the stroke over the last few millimeters; it is not adjustable, so use meter-out flow controls for heavier tooling masses.
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