Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-50
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-50 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 50mm fine-adjustable window — settable from 75 to 125mm, so you set the end position without changing hardware.
- BoreØ12 mm
- Nominal stroke125 mm
- Adjust window50 mm
- Effective range75–125 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 PBJ12X125-50
The AirTAC PBJ12X125-50 is a double-acting, double-rod pen-size mini cylinder with a 50 mm adjustable window. A rear adjuster screw (M5x0.8 thread) shortens the retract end, giving an effective stroke range of 75-125 mm from a 125 mm nominal length. The extend end remains fixed.
The slim SUS304 stainless body saves space in tight jigs. It uses an M5x0.8 air port and a fixed TPU bumper at each end. The Ø5 mm piston rod handles coaxial thrust; over long strokes or with off-axis loads, add an external guide to prevent side-load wear.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-50 Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-50 |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 50 mm (75–125 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 PBJ12X125-50
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -50 | 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 PBJ12X125-50 Is Used
Changeover Fixtures
Dial in the exact retract distance during product changeovers without machining new hard stops.
Trial Insertion Stops
Fine-tune insertion depth on prototype assemblies directly at the machine until the fit is perfect.
Variable Depth Pressing
Set precise pressing depths for different height components using the rear adjuster screw.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-50 the Right Cylinder?
Remember that adjusting the rear screw only alters the back position—the extend end is fixed. Always re-tighten the lock nut after setting your 75-125 mm range to prevent vibration drift. Confirm your ordering essentials: 12 mm bore, 125 mm nominal stroke, 50 mm window, and any required mounting brackets.
Quick checklist
- ✓ Need to fine-tune the end position on site
- ✓ Retract end sits within 75–125 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 PBJ12X125-50 FAQ
The effective stroke range is 75-125 mm.
The rear M5x0.8 adjuster screw shortens only the retract end; the extend end is fixed. After setting your desired length, re-tighten the lock nut to prevent vibration drift.
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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