Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-100S
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-100S 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 100mm fine-adjustable window — settable from 25 to 125mm, so you set the end position without changing hardware.
- BoreØ16 mm
- Nominal stroke125 mm
- Adjust window100 mm
- Effective range25–125 mm
- Port sizeM5×0.8
- Acting typeDouble acting
About the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-100S
The AirTAC PBJ16X125-100S is a double-acting, single-rod pen-size mini cylinder with a 100mm adjustable-stroke window. A rear adjuster screw and lock nut shorten the retract end, giving an effective stroke range of 25-125mm. This allows on-machine stroke tuning without ordering new hardware. The extend end remains fixed. Output force matches a standard PB cylinder of the same bore, delivering 100.5N push and 90.7N pull at 0.5MPa. The adjuster carries zero force penalty.
Built with a SUS304 stainless steel barrel and a slim 16mm body, it saves space in tight jigs and end-of-arm tooling. The Ø5mm piston rod uses an M10x1.0 rod-end thread, and the air port is M5x0.8. A fixed TPU bumper decelerates the last few millimeters of travel. Because the rod is only 5mm thick, use an external guide or linear bearing for off-axis loads over long strokes to prevent side-load damage. The built-in magnet works with reed or electronic switches.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-100S Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-100S |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø16 mm |
| Rod diameter | Ø5 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 100 mm (25–125 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 PBJ16X125-100S
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 16 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -100 | 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 PBJ16X125-100S Is Used
Changeover Fixtures
Quickly dial in the retract stop from 25 to 125mm during product changeovers, eliminating the need to swap physical spacers on the fly.
Trial Insertion Stops
Fine-tune insertion depths on prototype tooling by adjusting the rear screw, finding the exact position before locking the nut.
Variable Depth Pressing
Set precise pressing depths for different parts using the rear adjuster, relying on the 100.5N push force at 0.5MPa.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-100S the Right Cylinder?
When sizing this 16mm bore cylinder, consider the 100.5N push force at 0.5MPa. Good practice loads a cylinder to roughly 60-70% of theoretical force for smooth travel, yielding a safe working load of about 60N. For vertical lifts, this translates to lifting about 5.1kg with a 2:1 safety margin. If your application needs less force, dropping to a 12mm bore provides 56.5N push; if you need more, moving up is required. Remember that only the retract end is adjustable. After setting your 25-125mm range, re-tighten the lock nut so vibration does not drift the screw. Confirm your ordering essentials: 16mm bore, 125mm nominal stroke, 100mm window, S magnet, and any LB or FA mounts.
Quick checklist
- ✓ Need to fine-tune the end position on site
- ✓ Retract end sits within 25–125 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 PBJ16X125-100S FAQ
The effective stroke range is 25-125mm. At 0.5MPa, push force is 100.5N and pull force is 90.7N. At the maximum 0.7MPa operating pressure, push is 140.7N and pull is 126.9N. The air port is M5x0.8.
A rear M5x0.8 adjuster screw shortens the retract end, while the extend end remains fixed. You must re-tighten the lock nut after setting to prevent vibration drift. The cylinder does not hold position on air loss; the piston drifts and the fixed TPU bumper only decelerates near stroke end, so an external rod lock is needed for fail-safe holding.
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