Airtac PB Pen-type Cylinder PB12X125SR
The AirTAC Airtac PB Pen-type Cylinder PB12X125SR is a double-acting pen-size (mini) air cylinder with a Ø12mm bore and 125mm stroke. Its slim round barrel and back cover are stainless steel, the M5×0.8 ports keep plumbing compact, and the fast, low-friction piston suits high-cycle small-part handling.
- BoreØ12 mm
- Stroke125 mm
- Port sizeM5×0.8
- Acting typeDouble acting
- Rod threadM10×1.0
- CushionElastic bumper (both ends)
- 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 PB Pen-type Cylinder PB12X125SR
The AirTAC PB12X125SR is a JIS pen-size double-acting single-rod mini cylinder engineered for compact, high-frequency motion. It features a slim SUS304 stainless steel barrel and piston rod, offering excellent durability in damp or mildly corrosive environments while keeping weight low for end-of-arm tooling. Delivering 56.5 N of push force at 0.5 MPa, this 12mm bore unit is paired with a 125mm stroke.
This model includes an R axial air inlet for in-line plumbing and a built-in piston magnet (-S) for position sensing using AirTAC reed or electronic switches. Air connects via an M5x0.8 port, and the rod-end features an M10x1.0 thread.
Airtac PB Pen-type Cylinder PB12X125SR Technical Specifications
| Model | Airtac PB Pen-type Cylinder PB12X125SR |
|---|---|
| Series | PB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | M5×0.8 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 0.7 MPa |
| Proof pressure | 1.2 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 800 mm/s |
| Cushion | Elastic bumper (both ends) |
| Max standard stroke | Up to 300 mm |
Specifications follow the official AirTAC PB pen-size datasheet. Piston rod and barrel are stainless steel. Confirm bore, stroke and back-cover option against the product label before installation.
Theoretical Output Force (Ø12mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 56.5 N | 46.7 N |
| 0.7 MPa (max) | 79.1 N | 65.4 N |
Values are taken from the AirTAC PB thrust table. Because pull acts on the rod-side annular area, pull force is always lower than push. Actual usable force is reduced by friction — size with a margin.
Model Code: Airtac PB Pen-type Cylinder PB12X125SR
| PB | JIS pen-size double-acting mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| CB / U / R | Back cover: CB double clevis, U 90° side inlet, R axial inlet (bore-dependent). |
Mounting accessories: LB, FA, CJ. Related PB-family variants: PSB (single-acting push), PTB (single-acting pull), PBD (double rod), PBJ (adjustable stroke), PBR (front-mount).
Where the Airtac PB Pen-type Cylinder PB12X125SR Is Used
Carton Flap Folder
Tucks the minor flaps on small pharmaceutical cartons moving through a packaging conveyor, where the slim stainless body resists washdown chemicals and the 125mm stroke clears the product path.
Lab Sample Dispenser
Actuates a small pipetting head to aspirate reagents, relying on the built-in magnet for precise position confirmation and the compact profile to fit inside crowded diagnostic equipment.
Is the Airtac PB Pen-type Cylinder PB12X125SR the Right Cylinder?
When sizing this 12mm bore actuator, consider stepping down to the Ø10 variant if your payload is lighter, which provides 39.3 N push at 0.5 MPa. If you need more thrust, the Ø16 version steps up significantly to 100.5 N push at 0.5 MPa. For this PB12X125SR configuration, confirm your requirements for the 12mm bore, 125mm stroke, M5x0.8 port, S magnet, and R axial inlet.
Keep in mind that a plain pen-size body does not hold its position if air pressure drops or the valve is centered; the piston will drift, and the fixed bumper only decelerates near the end of travel. If your application requires a fail-safe hold under load, you must incorporate an external stop or a dedicated rod lock. Additionally, the Ø5 mm rod is designed for coaxial thrust, so over this 125mm stroke, use an external guide or linear bearing to prevent side-loading damage.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Slim pen body vs. a standard round cylinder
- ✓ Back cover: CB / U / R inlet direction
- ✓ Magnet (S) for sensors?
- ✓ Mounting: LB / FA / CJ or front thread
- ✓ Keep the load coaxial — avoid side load
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 0.7 MPa operating pressure.
- check Keep the load coaxial; avoid side load on the thin rod.
- check Do not dismantle the front or back cover.
- check Fit dust caps to ports during long-term storage.
- check Installation by qualified personnel per AirTAC docs.
Airtac PB Pen-type Cylinder PB12X125SR FAQ
This double-acting cylinder generates 56.5 N push and 46.7 N pull at 0.5 MPa. At the maximum operating pressure of 0.7 MPa, it produces 79.1 N push and 65.4 N pull. It operates between 0.15-0.7 MPa, runs at speeds of 50-800 mm/s, and has a proof pressure of 1.2 MPa.
It uses a fixed TPU bumper at each end to absorb impact over the final few millimeters, which is not adjustable or field-tunable. For higher speeds with real tooling mass, you should meter-out the exhaust or add an external shock absorber. The built-in magnet allows you to track position using AirTAC reed or electronic switches.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
Related AirTAC PB Pen-Size Cylinders
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