Airtac PTB Single Acting Pen-Type Cylinder PTB12X45R
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X45R is a single acting, pull type (spring extend) pen-size mini cylinder with a Ø12mm bore and 45mm 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
- Stroke45 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 PTB12X45R
The AirTAC PTB12X45R is a JIS pen-size single-acting pull cylinder, meaning air entering the single M5x0.8 port retracts the rod while an internal spring pushes it back out. This fail-safe extended state is ideal for holding parts secure when air pressure drops. With a 12 mm bore and 45 mm stroke, it provides 33.1 N of net pull at 0.5 MPa and 51.8 N at 0.7 MPa.
Because pulling acts on the smaller rod-side annular area, this output is naturally lower than a matching push cylinder. The SUS304 stainless body includes a fixed TPU bumper at each end to soften end-of-stroke impacts. For practical sizing, plan for a safe working load of about 20 N, which accounts for friction and smooth travel.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X45R Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X45R |
|---|---|
| Series | PTB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 45 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 PTB12X45R
| PTB | JIS pen-size single acting, pull type (spring extend) mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×45 | 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 PTB12X45R Is Used
Hold-Down Clamping
Uses spring pressure to keep a workpiece extended and secure, retracting only when air is applied to release the part.
Wire Belt Tensioner
Maintains steady pulling tension on a belt or wire assembly by default, relaxing the pull stroke via a single solenoid valve.
Retract-to-Open Gate
Holds a diverter gate closed via spring force, pulling it open pneumatically only when a product needs routing.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X45R the Right Cylinder?
When sizing this 12 mm bore model, consider the neighboring options. Dropping to a 10 mm bore yields 23.5 N net pull at 0.5 MPa, while stepping up to a 16 mm bore provides 65.0 N at the same pressure. The internal return spring requires a minimum 0.2 MPa operating pressure before the rod will move. This PTB12X45R configuration includes an R axial inlet for inline plumbing and lacks a sensor magnet.
Keep in mind the Ø5 mm piston rod is designed for coaxial thrust rather than side loading. Over this 45 mm stroke, adding an external guide or linear bearing helps prevent binding if your tooling generates off-axis forces. The fixed TPU bumper only decelerates the final few millimeters, so meter-out the exhaust if moving heavier masses at mid-to-high speeds.
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 PTB12X45R FAQ
This cylinder provides a net pull of 33.1 N at 0.5 MPa and 51.8 N at 0.7 MPa. Because the internal spring opposes motion, a minimum pressure of 0.2 MPa is required before the rod begins to retract.
The cylinder uses a fixed TPU bumper at each end to decelerate the last few millimeters of travel; it is not an adjustable cushion or a locking brake. This specific model does not include a sensor magnet.
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Related AirTAC PTB Pen-Size Cylinders
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