Airtac PTB Single Acting Pen-Type Cylinder PTB12X50CB
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X50CB is a single acting, pull type (spring extend) pen-size mini cylinder with a Ø12mm bore and 50mm 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
- Stroke50 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 PTB12X50CB
The AirTAC PTB12X50CB is a JIS pen-size single-acting pull cylinder with a 12 mm bore and 50 mm 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, making it ideal for holding or return-to-home tasks. It yields 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 mini body, it saves space in tight jigs and light end-of-arm tooling. The CB double clevis back cover accommodates pivoting loads. A fixed TPU bumper cushions the end caps. Because the return spring counteracts the air stroke, the quoted forces are already net values—do not deduct the spring again.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X50CB Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X50CB |
|---|---|
| Series | PTB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 50 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 PTB12X50CB
| PTB | JIS pen-size single acting, pull type (spring extend) mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×50 | 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 PTB12X50CB Is Used
Pivoting Hold-Down Clamp
Uses the CB clevis to swing into position. Air retracts the rod to clamp, and the spring fails-safe extended to release the part if air drops.
Wire Belt Tensioner
Pulls a tensioning idler back against a belt. The single-acting spring keeps constant outward pressure when the air line vents.
Retract-to-Open Gate
Air pulls the 50 mm stroke to open a small diverter gate. Exhausting the port lets the spring push the gate closed automatically.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X50CB the Right Cylinder?
This 12 mm bore provides 33.1 N net pull at 0.5 MPa. If you need less force, the 10 mm bore yields 23.5 N; for heavier pulling, the 16 mm bore offers 65.0 N. The internal spring sets a 0.2 MPa minimum pressure before motion begins. Plan for a safe working load of about 20 N (roughly 60% of the 0.5 MPa rating) to account for seal friction.
The CB double clevis suits pivoting linkages. The Ø5 mm rod handles coaxial thrust, but over this 50 mm stroke you should add an external linear bearing if any off-axis load is present. The rod-end thread is M10x1.0. Confirm your solenoid matches the single air line requirement before ordering.
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 PTB12X50CB 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 requires a minimum of 0.2 MPa before the rod will move. Without air, the spring holds the rod fail-safe extended.
It uses a fixed TPU bumper at each end to decelerate the last few millimeters of travel. This bumper is not adjustable. At higher speeds with real tooling mass, you should meter-out the exhaust or add an external shock absorber to prevent bottoming out.
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