Airtac PTB Single Acting Pen-Type Cylinder PTB12X40SRFA
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X40SRFA is a single acting, pull type (spring extend) pen-size mini cylinder with a Ø12mm bore and 40mm stroke. A single air port drives the pull stroke; the built-in return spring resets the rod when air is released, so only one solenoid line is needed.
- BoreØ12 mm
- Stroke40 mm
- Port sizeM5×0.8
- Acting typePull, single acting
- Rod threadM10×1.0
- ReturnSpring
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac PTB Single Acting Pen-Type Cylinder PTB12X40SRFA
The AirTAC PTB12X40SRFA is a JIS pen-size single-acting pull cylinder where air entering the M5x0.8 port retracts the rod, and exhausting air lets the internal spring push it back out. This fail-safe extended behavior is ideal for hold-down or return-to-home tasks where losing pressure safely locks the tooling in the out position. It provides a net pull of 33.1 N at 0.5 MPa and 51.8 N at 0.7 MPa, with the return spring force already subtracted.
Built with a SUS304 stainless barrel and a slim 12 mm body, it saves space in tight jigs and end-of-arm tooling. This variant includes a built-in piston magnet for position sensing with reed or electronic switches, an R axial inlet, and an FA mounting bracket. A fixed TPU bumper cushions the stroke ends, and the M10x1.0 rod end thread handles tooling attachment. For practical sizing, plan for a safe working load of about 20 N (roughly 60 percent of the 0.5 MPa rating) to account for friction.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X40SRFA Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X40SRFA |
|---|---|
| Series | PTB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 40 mm |
| Acting type | Single acting, pull type (spring extend) |
| 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 (pull by air) |
| Max standard stroke | Up to 60 mm |
The spring holds the rod extended; applying air retracts it, and removing air lets the spring push the rod back out. Forces below are the NET spring-deducted values from the AirTAC thrust table. Confirm against the product label before installation.
Net Pull Force (Ø12mm)
| Pressure | Net pull force |
|---|---|
| 0.5 MPa | 33.1 N |
| 0.7 MPa (max) | 51.8 N |
These are the usable pull 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 PTB Single Acting Pen-Type Cylinder PTB12X40SRFA
| PTB | JIS pen-size single acting, pull type (spring extend) mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| R | Back cover: R axial inlet (bore-dependent). |
Mounting accessories: LB, FA, CJ. Related PB-family variants: PB (double acting), PSB (single-acting push), PBD (double rod), PBR (front-mount).
Where the Airtac PTB Single Acting Pen-Type Cylinder PTB12X40SRFA Is Used
Hold-Down Clamping
Uses the spring-extend fail-safe to keep a workpiece secured in the out position, retracting only when air is applied to release the part.
Wire Belt Tensioner
Maintains constant tension on a belt or wire by default, pulling back to slacken the line only when compressed air is supplied.
Retract-to-Open Gate
Holds a diverting gate closed via spring force on a conveyor line, using the 33.1 N pull to draw the gate open and clear the path.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X40SRFA the Right Cylinder?
When sizing this 12 mm bore, note the pull acts on the smaller rod-side area, making it lower than a matching push cylinder. If your task needs less force, the 10 mm bore yields 23.5 N net pull at 0.5 MPa; if you need more power, stepping up to the 16 mm bore provides 65.0 N at 0.5 MPa. The internal spring requires a minimum 0.2 MPa operating pressure before motion begins. Confirm your FA bracket orientation and the 40 mm stroke fit your envelope.
With a 40 mm stroke, the thin Ø5 mm rod is built for coaxial thrust rather than side loading. Over this length, adding an external guide or linear bearing prevents binding under off-axis loads. The fixed TPU bumper only decelerates the final few millimeters, so at mid-to-high speeds with real tooling mass, meter-out the exhaust or install an external shock absorber to prevent bottoming out.
Quick checklist
- ✓ Net pull force at your working pressure
- ✓ Only one air line / solenoid needed
- ✓ Fail-safe extend 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 PTB Single Acting Pen-Type Cylinder PTB12X40SRFA FAQ
The net pull force is 33.1 N at 0.5 MPa and 51.8 N at 0.7 MPa (maximum pressure). Because an internal spring holds the rod extended, a minimum pressure of 0.2 MPa is required before the rod begins to retract.
The -S suffix indicates a built-in piston magnet for use with reed or electronic switches. Cushioning is handled by a fixed TPU bumper at each end; it only decelerates the last few millimeters of travel, so for heavier tooling at higher speeds, external shock absorption is recommended.
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