Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20 is a double-acting pen-size mini cylinder with a rear adjuster screw that shortens the retract end of the stroke. On a Ø16mm bore it gives a nominal 125mm stroke with a 20mm fine-adjustable window — settable from 105 to 125mm, so you set the end position without changing hardware.
- BoreØ16 mm
- Nominal stroke125 mm
- Adjust window20 mm
- Effective range105–125 mm
- Port sizeM5×0.8
- Acting typeDouble acting
About the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20
The AirTAC PBJ16X125-20 is a double-acting, single-rod pen-size mini cylinder with a 20mm adjustable stroke window. A rear adjuster screw (M5x0.8 thread) shortens the retract end, giving an effective stroke range of 105 to 125mm. The extend end remains fixed. Output force is identical to a standard PB cylinder, delivering about 100.5N push at 0.5MPa. The slim SUS304 stainless body saves space in tight jigs.
Air ports are M5x0.8 and the rod-end thread is M10x1.0. A fixed TPU bumper cushions each end. Because the stroke is long and the rod is a slender Ø5mm, use an external linear bearing for any off-axis loads. The adjuster is free of any force penalty, so you can tune the retract distance on the fly without downgrading thrust capacity.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20 Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20 |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø16 mm |
| Rod diameter | Ø5 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 20 mm (105–125 mm) |
| Adjuster thread | M5×0.8 |
| Port size | M5×0.8 |
|---|---|
| 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 200 mm |
The adjuster shortens only the retract end; the extend end is fixed. Force is unchanged from the standard PB double-acting cylinder. Confirm the set position 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 |
Adjusting the stroke does not change output force — these are the same values as the standard PB double-acting cylinder of the same bore. Size with a friction margin.
Model Code: Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 16 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -20 | Adjustable-stroke window in mm (10/20/30/40/50/75/100). |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
Fixed body — no separate back-cover code. Mounting accessories: LB, FA. Related PB-family variants: PB (fixed stroke), PBD (double rod), PBR (front-mount).
Where the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20 Is Used
Changeover Fixtures
Dial in the retract distance from 105 to 125mm during product changeovers to hit new stop positions without machining new hard stops.
Trial Insertion Stops
Fine-tune the back position for variable-depth press or insertion tasks, locking the nut once the exact depth is found.
End-of-Arm Tooling
Fit the slim 16mm stainless body into tight robotic grippers where a fixed length would fail to clear adjacent tooling.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20 the Right Cylinder?
This 16mm bore provides 100.5N push at 0.5MPa. If you need less force, the 12mm bore offers 56.5N push; if you need more, there is no larger bore in the pen series, so consider a standard profile cylinder. Remember that only the retract position is settable here—the extend end is fixed. After dialing in your 105-125mm range, re-tighten the lock nut so vibration does not drift the screw. Confirm your ordering essentials: 16mm bore, 125mm nominal stroke, 20mm window, no magnet, and your preferred mounting. Plan for a safe working load of about 60N (roughly 60% of the 0.5MPa figure) to account for seal friction.
Quick checklist
- ✓ Need to fine-tune the end position on site
- ✓ Retract end sits within 105–125 mm
- ✓ Force at your working pressure
- ✓ Magnet (S) for sensors?
- ✓ Access to the rear adjuster screw
- ✓ 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 Set the adjuster, then re-lock the check nut.
- check The adjuster shortens the retract end only.
- check Keep the load coaxial; avoid side load on the thin rod.
- check Do not dismantle the front or back cover.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20 FAQ
The effective stroke range is 105-125mm. Force is identical to a standard PB 16mm cylinder: 100.5N push and 90.7N pull at 0.5MPa, and 140.7N push and 126.9N pull at the 0.7MPa maximum. It uses an M5x0.8 air port.
A rear screw shortens only the retract end; the extend end is fixed. You set the length on the machine, then must re-tighten the lock nut to prevent vibration drift. This cylinder has no magnet, so it cannot support reed or electronic switches.
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Related AirTAC PBJ Pen-Size Cylinders
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