Airtac PTB Single Acting Pen-Type Cylinder PTB12X25R
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X25R is a single acting, pull type (spring extend) pen-size mini cylinder with a Ø12mm bore and 25mm 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
- Stroke25 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 PTB12X25R
The AirTAC PTB12X25R is a JIS pen-size single-acting pull cylinder where air entering the single M5x0.8 port retracts the rod, and an internal spring pushes it back out upon exhaust. This fail-safe extended state is ideal for holding parts securely when pneumatic pressure drops. It yields 33.1 N of net pull at 0.5 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. The Ø5 mm piston rod features an M10x1.0 end thread. Because pulling acts on the smaller rod-side area, this output is lower than a matching push cylinder. A fixed TPU bumper cushions the end strokes, and the R axial inlet keeps plumbing perfectly in-line.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X25R Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X25R |
|---|---|
| Series | PTB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 25 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 PTB12X25R
| PTB | JIS pen-size single acting, pull type (spring extend) 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 | 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 PTB12X25R Is Used
Hold-Down Clamping
Uses the fail-safe extended spring to keep a workpiece clamped during machining, retracting only when air is applied to release the part.
Wire Belt Tensioner
Maintains constant tension on a conveyor belt or wire feed, pulling back to slacken the line when pressurized for maintenance access.
Retract-To-Open Gate
Pulls a lightweight diverter gate open on command and lets the spring snap it closed to block product flow when the air supply stops.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X25R the Right Cylinder?
Selecting this 12 mm bore gives 33.1 N net pull at 0.5 MPa and 51.8 N at 0.7 MPa. If your jig needs less force, the 10 mm bore offers 23.5 N at 0.5 MPa. For heavier pulling, step up to the 16 mm bore providing 65.0 N at 0.5 MPa. The internal spring requires a minimum 0.2 MPa pressure before motion begins.
For sizing your work, plan for a safe working load of about 20 N, which is roughly 60 percent of the 0.5 MPa rating, ensuring smooth travel against seal friction. In a vertical lift setup, it holds or pulls about 1.7 kg with a sane 2:1 safety margin. Confirm your stroke needs 25 mm of retraction and that the R axial inlet matches your tubing orientation.
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 PTB12X25R FAQ
The net pull force is 33.1 N at 0.5 MPa and 51.8 N at the 0.7 MPa maximum. The internal return spring dictates a minimum pressure of 0.2 MPa before the rod can move. Without air, the spring holds the rod in the fail-safe extended position.
It uses a fixed TPU bumper at each end to decelerate the stroke over the last few millimeters. The cushioning is not adjustable. At higher cycle speeds with heavy tooling mass, you should meter-out the exhaust or add an external shock absorber to prevent bottoming out.
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Related AirTAC PTB Pen-Size Cylinders
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