Airtac PTB Single Acting Pen-Type Cylinder PTB12X20CB
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X20CB 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 PTB12X20CB
The AirTAC PTB12X20CB is a JIS pen-size mini cylinder configured for single-acting pull operation. Feeding air into 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, delivering 33.1 N of net pull at 0.5 MPa. The CB double clevis back cover accommodates pivoting loads.
Built with a SUS304 stainless barrel and a slim profile, it saves space on light end-of-arm tooling. The fixed TPU bumper decelerates motion at the stroke ends. Because pulling acts on the smaller rod-side area, this output is lower than a matching push cylinder. Plan for a safe working load of roughly 20 N, which accounts for seal friction at about sixty percent of the rated force.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X20CB Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X20CB |
|---|---|
| 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 PTB12X20CB
| 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 PTB12X20CB Is Used
Pivoting Hold-Down Clamp
Uses the CB clevis to swing clear of a part, pulling down to secure it for machining, then spring-extends to release safely.
Wire Belt Tensioner
Applies steady pulling tension on a conveyor belt or wire drive, automatically extending outward to maintain slack when air is removed.
Retract-to-Open Gate
Pulls a lightweight diverter gate closed during processing and relies on the spring to push the gate open if the air supply drops.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X20CB the Right Cylinder?
This 12 mm bore provides 33.1 N net pull at 0.5 MPa and 51.8 N at the 0.7 MPa maximum. If your pivoting jig needs less force, the 10 mm bore offers 23.5 N at 0.5 MPa; 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. A 20 mm stroke keeps the slender Ø5 mm rod stiff, but always support off-axis loads with an external linear bearing.
Ordering essentials confirm a double clevis mount and no sensor magnet. The rod-end thread is M10x1.0. For applications needing powered extension instead of retraction, select the PSB push series.
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 PTB12X20CB FAQ
The net pull force is 33.1 N at 0.5 MPa and 51.8 N at the 0.7 MPa maximum. Because the internal spring opposes the air stroke, a minimum 0.2 MPa pressure is required before the rod retracts. The spring holds the rod extended on air loss.
It uses a fixed TPU bumper at each end to decelerate the last few millimeters of travel. The bumper is not adjustable or a locking brake. At higher cycle speeds with real tooling mass, meter-out the exhaust or add an external shock absorber.
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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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