Airtac PTB Single Acting Pen-Type Cylinder PTB12X20R
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X20R is a single acting, pull type (spring extend) pen-size mini cylinder with a Ø12mm bore and 20mm 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
- Stroke20 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 PTB12X20R
The AirTAC PTB12X20R is a JIS pen-size single-acting pull cylinder where air entering the M5x0.8 port retracts the rod, while an internal spring pushes it back out. It delivers 33.1 N of net pull at 0.5 MPa (51.8 N at the 0.7 MPa maximum). Because the powered stroke acts on the smaller rod-side area, this usable force is lower than a matching push-type unit, making correct sizing essential.
The SUS304 stainless build and slim body fit tight jigs, while the fixed TPU bumper decelerates the rod at stroke ends. If air pressure drops, the spring ensures the rod fails safely in the extended position. Plan for a safe working load of roughly 20 N, which accounts for seal friction and smooth travel.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X20R Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X20R |
|---|---|
| Series | PTB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 20 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 PTB12X20R
| PTB | JIS pen-size single acting, pull type (spring extend) mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×20 | 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 PTB12X20R Is Used
Hold-Down Clamping
Uses spring pressure to keep a workpiece extended safely, applying air only to retract and release the part.
Belt Tensioner
Maintains steady pulling tension on a belt or wire, automatically returning to the extended home position if air fails.
Return Actuator
Pulls a lightweight mechanism out of the way and relies on the spring to push it back into the default working spot.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X20R the Right Cylinder?
This 12 mm bore provides 33.1 N net pull at 0.5 MPa. If your task requires 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 sets a 0.2 MPa minimum pressure before motion begins, and the rod stays extended automatically upon air loss.
This configuration includes the R axial inlet for inline plumbing and a 20 mm stroke. The Ø5 mm rod is designed for coaxial thrust, so add an external guide if your setup involves off-axis loads. No magnetic sensor is installed on this variant.
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 PTB12X20R FAQ
It provides 33.1 N net pull at 0.5 MPa and 51.8 N at 0.7 MPa maximum. The internal spring requires a minimum of 0.2 MPa before the rod moves, and the cylinder fails safely extended upon air loss.
A fixed TPU bumper decelerates the rod over the last few millimeters of travel. Because it is non-adjustable, you should meter-out the exhaust or add an external shock absorber when cycling real tooling mass at higher speeds.
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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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