Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SR
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SR 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 PTB12X20SR
The AirTAC PTB12X20SR is a JIS pen-size single-acting pull cylinder where air entering one M5x0.8 port retracts the rod, and 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 resists the air stroke, these figures already reflect the usable force after spring deduction.
This 12 mm bore model includes a built-in piston magnet for position sensing and an R axial inlet for in-line plumbing. The SUS304 stainless build and slim body save space in tight jigs. If air pressure drops, the spring forces the rod into the extended position, creating a fail-safe out state for hold-down or tensioning tasks. Plan for a safe working load of about 20 N, which is roughly 60 percent of the 0.5 MPa rating, to account for seal friction.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SR Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SR |
|---|---|
| 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 PTB12X20SR
| 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 PTB12X20SR Is Used
Hold-Down Clamping
Uses spring pressure to keep a workpiece extended and clamped, retracting only when air is applied to release the part.
Wire Belt Tensioner
Maintains steady pulling tension on a belt or wire, automatically pulling back to the safe extended home state if air loss occurs.
Retract-To-Open Gate
Pulls a lightweight diverter gate open on command and relies on the spring to close it securely during normal operation.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X20SR the Right Cylinder?
Select this 12 mm bore actuator when you need 33.1 N of net pull at 0.5 MPa. If your task requires less force, the 10 mm bore version offers 23.5 N at the same pressure. For heavier pulling, stepping up to the 16 mm bore yields 65.0 N. Keep in mind the internal spring sets a 0.2 MPa minimum pressure before motion begins. The fixed TPU bumper decelerates the rod only over the last few millimeters, so meter-out the exhaust or add an external shock absorber when cycling real tooling mass at mid to high speeds.
Confirm your ordering essentials: this configuration includes the S magnet for reed or electronic switches and the R back cover for axial plumbing. The Ø5 mm rod handles coaxial thrust well, but over long strokes or off-axis loads you should add an external guide or linear bearing to prevent side-load damage.
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 PTB12X20SR FAQ
The net pull force is 33.1 N at 0.5 MPa and 51.8 N at the 0.7 MPa maximum. Because an internal spring holds the rod extended, a minimum pressure of 0.2 MPa is required before the rod begins to retract.
The S suffix indicates a built-in piston magnet compatible with reed or electronic switches. Cushioning relies on a fixed TPU bumper that absorbs energy only in the final few millimeters of travel, so external shock absorption may be needed for heavy tooling.
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Related AirTAC PTB Pen-Size Cylinders
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