Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-40
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-40 is a double-acting, double-rod pen-size mini cylinder whose rear rod carries a stroke adjuster. On a Ø12mm 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.
- BoreØ12 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 PBJ12X125-40
The AirTAC PBJ12X125-40 is a double-acting, double-rod pen-size mini cylinder with a 12mm bore and a 125mm nominal stroke. A rear adjuster screw lets you trim the retract end, yielding an effective stroke range of 85-125mm. The extend end is fixed.
Built with a SUS304 stainless barrel and rod, this slim unit saves space in tight jigs. The M5x0.8 air port and M10x1.0 rod-end thread simplify integration. A fixed TPU bumper cushions each end.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-40 Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-40 |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø12 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 (Ø12mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 46.7 N | 46.7 N |
| 0.7 MPa (max) | 65.4 N | 65.4 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 PBJ12X125-40
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 12 | 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 PBJ12X125-40 Is Used
Variable-Depth Insertion
Dial in exact press depths for different material thicknesses on a single head, using the rear screw to shift the retract position without swapping cylinders.
Quick Changeover Fixtures
Adapt pick-and-place end-of-arm tooling to new part geometries in seconds by tuning the 85-125mm stroke window directly on the machine.
Trial Stop Positioning
Set precise retract stops during prototype runs or testing sequences, locking the nut once the optimal travel length is found.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-40 the Right Cylinder?
The rear M5x0.8 adjuster screw only shortens the retract position; the extend end remains fixed. Always re-tighten the lock nut after setting your 85-125mm range to prevent vibration drift.
Confirm your ordering essentials: 12mm bore, 125mm stroke, -40mm window, and mounting options (blank, LB, or FA). The thin Ø5mm piston rod handles coaxial thrust well, but over this 125mm stroke you should add an external linear bearing for any off-axis loads. This unit ships without a sensor magnet.
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 PBJ12X125-40 FAQ
The effective stroke range is 85-125mm. Adjusting the stroke does not alter these forces.
A rear M5x0.8 adjuster screw shortens the retract end by up to 40mm, while the extend end remains fixed. You must re-tighten the lock nut after setting your position to prevent vibration drift. The cylinder does not hold position on air loss without an external stop.
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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