Airtac PTB Single Acting Pen-Type Cylinder PTB12X50R
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X50R is a single acting, pull type (spring extend) pen-size mini cylinder with a Ø12mm bore and 50mm 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
- Stroke50 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 PTB12X50R
The AirTAC PTB12X50R is a JIS pen-size single-acting pull cylinder, meaning air entering the M5x0.8 port retracts the rod while an internal spring pushes it back out. It provides 33.1 N of net pull at 0.5 MPa and 51.8 N at 0.7 MPa. The R suffix designates an axial inline air inlet for streamlined plumbing in tight spaces.
Built with a SUS304 stainless barrel and a slim 12 mm body, this actuator saves space on light end-of-arm tooling. A fixed TPU bumper cushions the stroke ends. Because the return spring constantly opposes the air stroke, a minimum 0.2 MPa is required before motion begins. Plan for a safe working load of roughly 20 N to account for seal friction and smooth travel.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X50R Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X50R |
|---|---|
| Series | PTB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 50 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 PTB12X50R
| PTB | JIS pen-size single acting, pull type (spring extend) mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×50 | 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 PTB12X50R Is Used
Hold-Down Clamp
Uses spring pressure to keep a part extended, then retracts to release the workpiece when air is applied.
Belt Tensioner
Maintains steady pulling tension on a belt or wire via the spring, using air only to slacken the line.
Retract-to-Open Gate
Spring holds the gate closed by default; energizing the single port pulls the actuator back to allow passage.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X50R the Right Cylinder?
This 12 mm bore generates 33.1 N of usable pull at 0.5 MPa. If your jig needs less force, the 10 mm bore offers 23.5 N; stepping up to the 16 mm bore yields 65.0 N for heavier tensioning. The 50 mm stroke sits well within the 60 mm single-acting limit, but the slender Ø5 mm rod requires an external guide if you encounter any off-axis loads over this distance.
Remember that without live air the spring holds the rod fully extended, making it a fail-safe option for return-to-home tasks. This specific configuration includes an R axial back cover and no magnet sensor.
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 PTB12X50R FAQ
It delivers 33.1 N of net pull at 0.5 MPa and 51.8 N at 0.7 MPa. Because an internal spring constantly opposes the air stroke, a minimum pressure of 0.2 MPa is required before the rod will move.
A fixed TPU bumper decelerates the rod over the last few millimeters of travel. The internal spring automatically extends the rod when air is exhausted, providing a fail-safe extended state. At higher speeds with heavy tooling mass, meter-out the exhaust or add an external shock absorber.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Related AirTAC PTB Pen-Size Cylinders
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