Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-75
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-75 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 75mm fine-adjustable window — settable from 50 to 125mm, so you set the end position without changing hardware.
- BoreØ16 mm
- Nominal stroke125 mm
- Adjust window75 mm
- Effective range50–125 mm
- Port sizeM5×0.8
- Acting typeDouble acting
About the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-75
The AirTAC PBJ16X125-75 is a double-acting, single-rod pen-size mini cylinder with a 75mm adjustable window, yielding an effective stroke range of 50-125mm. A rear adjuster screw and lock nut shorten the retract end so you can tune the stroke directly on the machine. The extend end remains fixed. Force is identical to a standard PB cylinder of this bore, delivering 100.5N push and 90.7N pull at 0.5MPa.
Built with a SUS304 stainless barrel and slim body, it saves space in tight jigs and end-of-arm tooling. The M5x0.8 air port and M10x1.0 rod-end thread match standard 16mm bore hardware. A fixed TPU bumper decelerates the last few mm of travel. Because the Ø5mm rod is slender, use an external guide for off-axis loads over this long stroke.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-75 Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-75 |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø16 mm |
| Rod diameter | Ø5 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 75 mm (50–125 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 PBJ16X125-75
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 16 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -75 | 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 PBJ16X125-75 Is Used
Changeover Fixtures
Dial in the retract stop from 50 to 125mm during product changeovers without machining new hard stops.
Trial Insertion Depths
Set variable insertion depths on test jigs by turning the rear screw, locking the nut once the depth is proven.
Variable Press Stops
Adjust the retract position on light-duty assembly presses to accommodate different part heights on the fly.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-75 the Right Cylinder?
This 16mm bore provides 100.5N push at 0.5MPa. Stepping down to a 12mm bore yields 56.5N push, while moving up is required for heavier loads. Plan for a safe working load of about 60N, which is roughly 60% of the theoretical 0.5MPa force to account for seal friction. For vertical lifts, expect to raise about 5.1kg with a 2:1 safety margin.
Remember that only the retract position is settable; the extend end is fixed. After dialing in the 50-125mm range, re-tighten the lock nut to prevent vibration drift. Confirm your ordering essentials: 16mm bore, 125mm nominal stroke, 75mm window, no magnet, and mounting choice.
Quick checklist
- ✓ Need to fine-tune the end position on site
- ✓ Retract end sits within 50–125 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 PBJ16X125-75 FAQ
The effective stroke range is 50-125mm. 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.
A rear screw shortens the retract end while the extend end stays 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 use an external stop for fail-safe holding.
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Related AirTAC PBJ Pen-Size Cylinders
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