Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40 is a double-acting, double-rod pen-size mini cylinder whose rear rod carries a stroke adjuster. On a Ø16mm bore it gives a nominal 125mm stroke with a 40mm fine-adjustable window — settable from 85 to 125mm, so you set the end position without changing hardware.
- BoreØ16 mm
- Nominal stroke125 mm
- Adjust window40 mm
- Effective range85–125 mm
- Port sizeM5×0.8
- Acting typeDouble acting
- 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 PBJ Adjustable Pen-Type Cylinder PBJ16X125-40
The AirTAC PBJ16X125-40 is a double-acting, double-rod pen-size mini cylinder featuring a 40mm adjustable window. By turning the rear M5x0.8 adjuster screw, you set the effective stroke anywhere from 85mm up to the 125mm maximum.
Built with a SUS304 stainless rod and barrel, this slim 16mm bore unit integrates a fixed TPU bumper at each end. The air port is M5x0.8, and the rod-end thread measures M10x1.0. Because the piston rod is just Ø5mm, use an external guide or linear bearing for off-axis loads over long strokes, as the thin rod is built for coaxial thrust rather than side loading.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40 Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40 |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø16 mm |
| Rod diameter | Ø5 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 40 mm (85–125 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 |
PBJ is a double-rod cylinder: the rear rod carries the stroke adjuster, which sets the stroke end within the adjustable window. Confirm the set position against the product label before installation.
Theoretical Output Force (Ø16mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 90.7 N | 90.7 N |
| 0.7 MPa (max) | 126.9 N | 126.9 N |
The rear rod passes through the rear cover, so both piston faces lose rod area: push is shown at the annular-area value (conservative), lower than a single-rod PB push of the same bore. Size with a friction margin.
Model Code: Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 16 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -40 | 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 PBJ16X125-40 Is Used
Changeover Fixtures
Dial in the 85-125mm retract length on the fly for product family changeovers without machining new hard stops.
Trial Stops
Set precise intermediate positions during testing and lock the M5x0.8 adjuster nut to prevent drift.
Variable-Depth Insertion
Tune the extend end depth for different part heights, relying on the fixed TPU bumper for end-of-stroke cushioning.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40 the Right Cylinder?
Remember that only the retract end is adjustable; the extend position is fixed. Always re-tighten the lock nut after setting your range to prevent vibration drift. Confirm your ordering essentials: 16mm bore, 125mm stroke, 40mm window, no magnet, and your preferred mounting option.
Note that a plain cylinder does not hold position on air loss; the piston drifts, and the fixed TPU bumper only decelerates the last few millimeters.
Quick checklist
- ✓ Need to fine-tune the end position on site
- ✓ Retract end sits within 85–125 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 Double rod: the rear rod carries the stroke adjuster.
- 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 PBJ16X125-40 FAQ
The effective stroke range is 85-125mm. At 0.5 MPa, push force is 100.5N and pull force is 90.7N. At the maximum 0.7 MPa operating pressure, push is 140.7N and pull is 126.9N. These figures match a standard PB cylinder of the same bore.
The rear M5x0.8 screw shortens only the retract end of the stroke, while the extend end remains fixed. You must re-tighten the lock nut after setting the desired length to prevent vibration drift. This model does not include a sensor magnet.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC PBJ Pen-Size Cylinders
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