Airtac PTB Single Acting Pen-Type Cylinder PTB12X40R
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X40R 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 PTB12X40R
The AirTAC PTB12X40R is a JIS pen-size single-acting pull cylinder with a 12 mm bore and 40 mm stroke. Air entering the single M5x0.8 port retracts the rod, while an internal spring pushes it back out. This provides a fail-safe extended state during air loss, ideal for holding parts or returning mechanisms to a safe home position. It delivers 33.1 N of net pull at 0.5 MPa and 51.8 N at 0.7 MPa.
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. A fixed TPU bumper decelerates the stroke ends. Because the powered motion acts on the 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 PTB12X40R Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X40R |
|---|---|
| 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 PTB12X40R
| 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 PTB12X40R Is Used
Hold-Down Clamping
Uses the spring-extended rod to keep a workpiece secured. Applying air retracts the clamp to load a new part.
Wire Belt Tensioner
Maintains steady tension on a belt or wire. The cylinder pulls back under air pressure and relaxes when exhaust.
Retract-To-Open Gate
Powers a small diverter gate closed by pulling it shut. The spring automatically opens the gate on air loss.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X40R the Right Cylinder?
This 12 mm bore provides 33.1 N net pull at 0.5 MPa. If your task needs less force, the 10 mm bore offers 23.5 N; stepping up to the 16 mm bore yields 65.0 N. The internal return spring requires a minimum 0.2 MPa pressure before the rod will move. Without live air, the spring reliably holds the rod extended.
This configuration includes the R axial inlet for inline plumbing and lacks a sensor magnet. The 40 mm stroke sits well within the 60 mm single-acting limit. Remember the thin Ø5 mm rod is built for coaxial thrust, so add an external guide if your setup involves off-axis loads over this distance.
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 PTB12X40R FAQ
The net pull force is 33.1 N at 0.5 MPa and 51.8 N at 0.7 MPa. The internal return spring sets a minimum pressure of 0.2 MPa before the rod moves. On air loss, the spring pushes the rod to the extended position.
A fixed TPU bumper decelerates the rod at the stroke ends but is not adjustable. At higher speeds with real tooling mass, meter-out the exhaust or add an external shock absorber. This specific model does not include a sensor magnet.
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Related AirTAC PTB Pen-Size Cylinders
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