Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75 is a double-acting pen-size mini cylinder with a rear adjuster screw that shortens the retract end of the stroke. 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
About the Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75
The AirTAC PBJ12X125-75 is a double-acting, single-rod pen-size mini cylinder with a 75 mm adjustable window. A rear M5x0.8 adjuster screw shortens the retract end, yielding an effective stroke range of 50-125 mm from the 125 mm nominal length. The extend end remains fixed. Output force matches a standard PB series bore 12 cylinder, delivering 56.5 N push at 0.5 MPa without any penalty for the tuning feature.
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. For practical sizing, plan for a safe working load of roughly 34 N at 0.5 MPa, accounting for seal friction and smooth travel. The Ø5 mm piston rod handles coaxial thrust well, but over this long stroke add an external guide if the load is off-axis.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75 Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75 |
|---|---|
| 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 |
The adjuster shortens only the retract end; the extend end is fixed. Force is unchanged from the standard PB double-acting cylinder. Confirm the set position against the product label before installation.
Theoretical Output Force (Ø12mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 56.5 N | 46.7 N |
| 0.7 MPa (max) | 79.1 N | 65.4 N |
Adjusting the stroke does not change output force — these are the same values as the standard PB double-acting cylinder of the same bore. Size with a friction margin.
Model Code: Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75
| 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 PBJ12X125-75 Is Used
Variable-Depth Insertion
Dial in exact insertion depth for delicate electronics. The rear screw tunes the retract from 50 to 125 mm, letting operators change part profiles without swapping cylinders.
Quick Changeover Fixtures
Adapt test stands rapidly between product variants. The on-machine adjuster eliminates the need to reorder hardware for slightly different stroke lengths.
Trial Stop Positioning
Set precise end-of-stroke stops during prototype runs. Lock the nut once the ideal position is found to maintain repeatability across cycles.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ12X125-75 the Right Cylinder?
This 12 mm bore provides 56.5 N push at 0.5 MPa. Stepping down to a 10 mm bore yields 39.3 N push, while stepping up to a 16 mm bore offers 100.5 N push. Select this model when your fixture needs field-tuning within the 50-125 mm range. Remember that only the back position is adjustable; the extend end is fixed. Re-tighten the lock nut after setting to prevent vibration drift. Confirm your ordering essentials: bore, stroke, window, and mount.
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 The adjuster shortens the retract end only.
- 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 PBJ12X125-75 FAQ
The effective stroke range is 50-125 mm. Force is identical to a standard PB bore 12: push is 56.5 N and pull is 46.7 N at 0.5 MPa. At the 0.7 MPa maximum, push is 79.1 N and pull is 65.4 N. Adjusting the stroke does not alter these force figures.
A rear M5x0.8 screw shortens only the retract end; the extend end is fixed. You must re-tighten the lock nut after setting to prevent vibration drift. A plain cylinder does not hold position on air loss—the piston drifts, and the fixed TPU bumper only decelerates near stroke end. Use an external stop for a fail-safe hold.
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Related AirTAC PBJ Pen-Size Cylinders
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