Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75S
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75S 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 75mm fine-adjustable window — settable from 50 to 125mm, so you set the end position without changing hardware.
- BoreØ12 mm
- Nominal stroke125 mm
- Adjust window75 mm
- Effective range50–125 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 PBJ12X125-75S
The AirTAC PBJ12X125-75S is a double-acting, double-rod pen-size mini cylinder with a 75mm adjustment window. A rear screw and lock nut shorten the retract end, giving an effective stroke range of 50-125mm. You set the exact length on the machine without ordering new hardware. The extend end remains fixed.
The SUS304 stainless build includes a fixed TPU bumper and a built-in magnet for reed or electronic switches. The M5x0.8 port and Ø5mm rod handle coaxial thrust, while the M10x1.0 rod-end thread simplifies fixture mounting.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75S Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75S |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø12 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 |
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 PBJ12X125-75S
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 12 | 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 PBJ12X125-75S Is Used
Changeover Fixtures
Adapt pick-and-place jigs to new part lengths instantly by dialing the retract end back from 125mm to 50mm without swapping cylinders.
Trial Stops
Fine-tune the stopping position of a light assembly carriage during prototype runs, locking the nut once the optimal window is found.
Variable-Depth Press
Insert pins or probes to varying depths on a single station by adjusting the back-position screw within the 50-125mm range.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75S the Right Cylinder?
Remember that only the retract position is adjustable—extend remains fixed. After setting your 50-125mm range, re-tighten the lock nut so vibration does not drift the screw. Confirm your ordering essentials: bore, stroke, window, magnet S, and mount.
The Ø5mm rod handles coaxial thrust well, but over long strokes add an external guide to prevent side load. The fixed TPU bumper only decelerates the last few millimeters; above mid-speed with real tooling mass, meter-out the exhaust or add an external shock absorber.
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 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 PBJ12X125-75S FAQ
The effective stroke range is 50-125mm. Adjusting the stroke does not change these force figures.
A rear M5x0.8 adjuster screw shortens the retract end only; the extend end is fixed. You must re-tighten the lock nut after setting to prevent vibration drift. The S suffix indicates a built-in piston magnet for position sensing with reed or electronic switches.
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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