Airtac PB Pen-type Cylinder PB16X125U
The AirTAC Airtac PB Pen-type Cylinder PB16X125U is a double-acting pen-size (mini) air cylinder with a Ø16mm 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.
- BoreØ16 mm
- Stroke125 mm
- Port sizeM5×0.8
- Acting typeDouble acting
- Rod threadM10×1.0
- CushionElastic bumper (both ends)
About the Airtac PB Pen-type Cylinder PB16X125U
The AirTAC PB16X125U is a double-acting JIS pen-size mini cylinder featuring a 16mm bore and 125mm stroke. It delivers a robust 100.5 N push and 90.7 N pull at 0.5 MPa, making it the highest force class in this slim stainless steel family. The U suffix designates a 90-degree side air inlet, allowing flat plumbing in confined spaces.
Built with a SUS304 stainless steel piston rod and barrel, it resists damp and mildly corrosive environments. The M5x0.8 port and M10x1.0 rod-end thread simplify load coupling. Operating at speeds up to 800 mm/s, it relies on a fixed TPU bumper at each end to decelerate the last few millimeters of travel. Because the bumper is not adjustable, adding an external shock absorber is recommended when moving real tooling mass at high velocities.
Airtac PB Pen-type Cylinder PB16X125U Technical Specifications
| Model | Airtac PB Pen-type Cylinder PB16X125U |
|---|---|
| Series | PB JIS pen-size mini cylinder |
| Bore size | Ø16 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 (Ø16mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 100.5 N | 90.7 N |
| 0.7 MPa (max) | 140.7 N | 126.9 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 PB16X125U
| PB | JIS pen-size double-acting mini-cylinder series. |
|---|---|
| 16 | 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 PB16X125U Is Used
Package Diverting Flap
Actuates a lightweight routing flap on a packaging conveyor, using the 90-degree side inlet to keep air lines flush against the machine frame.
Textile Yarn Guide
Shifts a thread guide across a weaving loom, leveraging the SUS304 stainless barrel to withstand humid manufacturing conditions.
Small Parts Ejector
Pushes molded plastic parts out of a die cavity, relying on the 100.5 N extend force to overcome minor release friction.
Is the Airtac PB Pen-type Cylinder PB16X125U the Right Cylinder?
This 16mm bore provides the maximum thrust available in the PB series. If you need slightly less force, stepping down to the 12mm bore yields 56.5 N push at 0.5 MPa. Since 16mm is the largest standard pen-size option, moving beyond this requires a different body style. For this specific model, plan for a safe working load of about 60 N, which is roughly 60% of the 100.5 N theoretical output at 0.5 MPa. This equates to lifting about 5.1 kg vertically with a sane 2:1 safety margin.
When ordering, confirm the 125mm stroke, M5x0.8 port, and the U-type 90-degree side inlet. Note that a plain PB cylinder does not hold its position if air pressure is lost or the valve is centered; the piston will drift. If your application requires fail-safe load holding, you must specify an external stop or rod lock. The thin Ø5 mm rod is designed for coaxial thrust, so over this 125mm stroke, use an external guide or linear bearing to prevent off-axis side loading.
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 PB16X125U FAQ
At 0.5 MPa, the push force is 100.5 N and the pull force is 90.7 N. At the maximum operating pressure of 0.7 MPa, the push is 140.7 N and the pull is 126.9 N. The operating pressure range is 0.15-0.7 MPa, with a speed range of 50-800 mm/s.
The U suffix indicates a 90-degree perpendicular side air inlet for flat plumbing in tight spaces. The cylinder uses a fixed TPU bumper at both ends to decelerate the piston near stroke end. This bumper is not adjustable and does not act as a brake, so for high-speed loads you should meter-out the exhaust or add an external shock absorber.
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