Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-30S
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-30S 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 30mm fine-adjustable window — settable from 95 to 125mm, so you set the end position without changing hardware.
- BoreØ12 mm
- Nominal stroke125 mm
- Adjust window30 mm
- Effective range95–125 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 PBJ12X125-30S
The AirTAC PBJ12X125-30S is a double-acting, double-rod pen-size mini cylinder with a 12 mm bore and a built-in magnet for reed or electronic switches. A rear adjuster screw with an M5x0.8 thread shortens the retract end, giving an effective stroke range of 95-125 mm from the 125 mm nominal length. The extend end remains fixed. The slim SUS304 stainless body saves space in tight jigs.
Air ports are M5x0.8 and the rod-end thread is M10x1.0. A fixed TPU bumper cushions each end. For real-world sizing, plan for about 34 N of work at 0.5 MPa, which is roughly 60 percent of the theoretical push. The Ø5 mm rod handles coaxial thrust; over this 125 mm stroke, add an external guide for off-axis loads. The bumper only decelerates the last few mm, so meter-out the exhaust or add a shock absorber for heavy tooling.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-30S Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-30S |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 30 mm (95–125 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 PBJ12X125-30S
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -30 | 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 PBJ12X125-30S Is Used
Changeover Fixtures
Dial in the retract stop during product changeovers to accommodate different part heights without swapping out cylinder hardware.
Trial Insertion Stops
Fine-tune the insertion depth on test assemblies by adjusting the back position screw on the fly to find the optimal depth.
Variable Depth Pressing
Set exact pressing distances for varied components using the rear adjuster, ensuring precise end positions for each task.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-30S the Right Cylinder?
Remember that only the retract position is field-adjustable; the extend end is fixed. After setting your 95-125 mm range, re-tighten the lock nut because vibration can drift an unlocked screw. Confirm your ordering essentials: 12 mm bore, 125 mm nominal stroke, 30 mm window, S magnet, and any LB or FA mount.
Quick checklist
- ✓ Need to fine-tune the end position on site
- ✓ Retract end sits within 95–125 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 PBJ12X125-30S FAQ
The effective stroke range is 95-125 mm. At 0.5 MPa, push force is 56.5 N and pull is 46.7 N. At the maximum 0.7 MPa pressure, push is 79.1 N and pull is 65.4 N. Adjusting the stroke does not change these force figures.
The rear screw shortens the retract end only; the extend end is fixed. You must re-tighten the lock nut after setting to prevent vibration drift. A plain cylinder does not hold its load on air loss or a centered valve—the piston drifts and the fixed TPU bumper only decelerates near stroke end. Use an external stop or rod lock for fail-safe holding.
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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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