Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SCB
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SCB 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 PTB12X20SCB
The AirTAC PTB12X20SCB 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 provides 33.1 N of net pull at 0.5 MPa and 51.8 N at 0.7 MPa. Because the return spring constantly pushes outward, the rod achieves a fail-safe extended state if air pressure drops.
This variant includes a built-in piston magnet for position sensing and a CB double clevis back cover for pivoting mounts. The slim SUS304 stainless body saves space in tight jigs, and a fixed TPU bumper cushions the stroke ends. Plan for a safe working load of about 20 N, which is roughly 60 percent of the rated force, to account for friction.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SCB Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SCB |
|---|---|
| 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 PTB12X20SCB
| 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 PTB12X20SCB Is Used
Pivoting Hold-Down Clamp
Uses the CB clevis to swing into position, applying 33.1 N of pull to secure light panels while the spring safely retracts the clamp on air loss.
Wire Belt Tensioner
Maintains steady tension on conveyor belts, letting the spring hold the rod extended while air retracts it to slacken the line for maintenance.
Retract-to-Open Gate
Pulls a lightweight diverter gate closed during operation, with the fail-safe extended position pushing the gate open to clear jams automatically.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SCB the Right Cylinder?
Choosing this 12 mm bore gives 33.1 N of usable pull at 0.5 MPa. If your task requires less force, the 10 mm bore yields 23.5 N, whereas stepping up to the 16 mm bore provides 65.0 N. Remember the internal spring sets a 0.2 MPa minimum pressure before motion begins, and the rod stays extended by default during air loss.
The CB double clevis suits articulated mechanisms requiring angular alignment. Featuring a 20 mm stroke, an M10x1.0 rod-end thread, and a 5 mm rod, verify your pivot geometry to avoid side loading. The integrated magnet supports reed or electronic switches for end-of-stroke confirmation.
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 PTB12X20SCB FAQ
It delivers a net pull of 33.1 N at 0.5 MPa and 51.8 N at 0.7 MPa. Because the internal spring opposes the air stroke, a minimum pressure of 0.2 MPa is required before the rod retracts. The spring automatically extends the rod if air is lost.
The 5 mm rod is designed for coaxial thrust, so add an external guide for off-axis loads. The fixed TPU bumper only decelerates the last few millimeters of travel; for high speeds with real tooling mass, meter-out the exhaust or add an external shock absorber.
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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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