Airtac PTB Single Acting Pen-Type Cylinder PTB12X25CB
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X25CB 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 PTB12X25CB
The AirTAC PTB12X25CB is a JIS pen-size single-acting pull cylinder with a 12mm bore and 25mm stroke. Air entering the single M5x0.8 port retracts the rod, while an internal spring pushes it back out upon exhaust release. This provides a fail-safe extended state during air loss, delivering 33.1 N of net pull at 0.5 MPa. The CB double clevis back cover accommodates pivoting loads.
Built with a SUS304 stainless barrel and a slim 5mm rod, this mini actuator saves space in tight jigs. The fixed TPU bumper decelerates motion at stroke ends. Because the powered stroke acts on the smaller rod-side area, this pull force is lower than a matching push cylinder. Plan for a safe working load of about 20 N, which accounts for seal friction and smooth travel.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X25CB Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X25CB |
|---|---|
| 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 PTB12X25CB
| 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 PTB12X25CB Is Used
Pivoting Hold-Down Clamp
Uses the CB clevis to swing into place and pull 33.1 N at 0.5 MPa, releasing automatically to a safe extended position on air loss.
Wire Belt Tensioner
Maintains steady tension via the spring-extend design while the air line retracts the arm to slacken the belt for maintenance.
Retract-To-Open Gate
Air retracts the 5mm rod to open a small diversion gate; exhaust springs it shut, ensuring the lane closes if pneumatic pressure drops.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X25CB the Right Cylinder?
This 12mm bore provides 33.1 N net pull at 0.5 MPa and 51.8 N at the 0.7 MPa maximum. If you need less force, the 10mm bore yields 23.5 N at 0.5 MPa; for heavier pulling, step up to the 16mm bore for 65.0 N. The internal return spring requires a minimum 0.2 MPa pressure before motion begins. Without live air, the spring holds the rod safely extended.
Confirm your pivot requirements suit the CB double clevis. The rod-end thread is M10x1.0. Remember the 5mm rod is for coaxial thrust; over the 25mm stroke or under off-axis loads, add an external guide to prevent side loading.
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 PTB12X25CB FAQ
The net pull force is 33.1 N at 0.5 MPa and 51.8 N at 0.7 MPa (maximum pressure). The internal spring sets a 0.2 MPa minimum pressure before the rod moves. On air loss, the spring fail-safely holds the rod extended.
It uses a fixed TPU bumper at each end to decelerate the last few millimeters of travel. Because it is not adjustable, metering out the exhaust or adding an external shock absorber is recommended when cycling real tooling mass at higher speeds.
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