Airtac PTB Single Acting Pen-Type Cylinder PTB12X25SR
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X25SR 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 PTB12X25SR
The AirTAC PTB12X25SR is a JIS pen-size single-acting pull cylinder where air entering the single M5x0.8 port retracts the rod, while an internal spring pushes it back out upon exhaust. This provides a fail-safe extended state, ensuring the rod safely returns home if air pressure drops. Delivering 33.1 N of net pull at 0.5 MPa, it uses a slim SUS304 stainless body with a fixed TPU bumper to save space in tight jigs.
Because the powered stroke pulls against the rod-side area, the output is lower than a matching push cylinder. The built-in magnet (-S) supports reed or electronic switches for position sensing, and the axial R inlet keeps plumbing perfectly in-line. Plan for a safe working load of about 20 N (roughly 60% of the rated force) to account for seal friction and smooth travel.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X25SR Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X25SR |
|---|---|
| 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 PTB12X25SR
| 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 PTB12X25SR Is Used
Hold-Down Clamping
Keeps a workpiece clamped under tension during machining, using the spring to safely release the part outward when air is removed.
Wire Belt Tensioner
Maintains steady pulling force on a moving belt or wire, automatically extending back out to preserve tension on air loss.
Retract-To-Open Gate
Pulls a lightweight diverter gate shut on command and lets the spring push it open to a safe home position for line clearance.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X25SR the Right Cylinder?
This 12 mm bore provides 33.1 N net pull at 0.5 MPa and 51.8 N at 0.7 MPa. If your jig needs less force, stepping down to the 10 mm bore yields 23.5 N at 0.5 MPa; moving up to the 16 mm bore provides 65.0 N. The internal return spring requires a minimum 0.2 MPa pressure before the rod will move, and the unit fails safe in the extended position.
The Ø5 mm rod handles coaxial thrust well, but over the 25 mm stroke or under off-axis loads you should add an external linear bearing to prevent binding. The fixed TPU bumper only decelerates the last few millimeters, so meter-out the exhaust if moving real tooling mass at mid-to-high speeds. Confirm your porting matches the M5x0.8 thread and M10x1.0 rod-end thread.
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 PTB12X25SR FAQ
It delivers 33.1 N of net pull at 0.5 MPa and 51.8 N at 0.7 MPa maximum. The internal spring requires at least 0.2 MPa to overcome the return mechanism and move the rod.
The fixed TPU bumper absorbs impact only in the final few millimeters of travel; add an external shock absorber for heavy high-speed loads. The built-in magnet works with reed or electronic switches for precise position detection.
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1-Year Warranty
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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Most inquiries answered within 7-8 hours.
Related AirTAC PTB Pen-Size Cylinders
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