Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50 is a double-acting pen-size mini cylinder with a rear adjuster screw that shortens the retract end of the stroke. On a Ø16mm 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.
- BoreØ16 mm
- Nominal stroke125 mm
- Adjust window50 mm
- Effective range75–125 mm
- Port sizeM5×0.8
- Acting typeDouble acting
About the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50
The AirTAC PBJ16X125-50 is a double-acting, single-rod pen-size mini cylinder with a 50 mm adjustable-stroke window. A rear adjuster screw and lock nut let you shorten the retract end, giving an effective stroke range of 75-125 mm. The extend end remains fixed. Output force matches a standard PB body of the same bore, delivering 100.5 N push at 0.5 MPa, so tuning the length imposes zero force penalty.
This slim SUS304 stainless build features a fixed TPU bumper at each end and an M5x0.8 air port. The Ø5 mm piston rod carries an M10x1.0 rod-end thread. For practical sizing at 0.5 MPa, plan for a safe working load of about 60 N (roughly 60% of theoretical) to account for seal friction. This equates to lifting around 5.1 kg vertically with a sane 2:1 safety margin.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50 Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50 |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø16 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 |
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 (Ø16mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 100.5 N | 90.7 N |
| 0.7 MPa (max) | 140.7 N | 126.9 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 PBJ16X125-50
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 16 | 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 PBJ16X125-50 Is Used
Variable-Depth Insertion
Dial in precise retract stops for pressing pins or plugs to different depths on a single fixture without swapping hardware.
Quick Changeover Jigs
Adjust the 75-125 mm effective stroke rapidly during product changeovers to accommodate new part heights.
Trial Positioning Stops
Fine-tune the back position during machine commissioning to find the exact travel needed before final lockdown.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50 the Right Cylinder?
When sizing, note the neighbouring bores: a 12 mm PB pushes 56.5 N, while a 16 mm pushes 100.5 N at 0.5 MPa. This PBJ16X125-50 provides substantial force for tight jigs. Remember that only the retract position is field-settable; the extend end is fixed. Always re-tighten the lock nut after setting the M5x0.8 adjuster screw, as vibration can drift an unlocked mechanism.
Confirm your ordering essentials: 16 mm bore, 125 mm nominal stroke, 50 mm window, no magnet, and mounting choice. The thin Ø5 mm rod is built for coaxial thrust; over this 125 mm stroke or with off-axis loads, add an external guide or linear bearing to prevent side-load damage.
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 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 PBJ16X125-50 FAQ
The effective stroke range is 75-125 mm. At 0.5 MPa, push is 100.5 N and pull is 90.7 N. At the maximum 0.7 MPa operating pressure, push is 140.7 N and pull is 126.9 N. These figures match a standard PB cylinder of the same bore.
A rear M5x0.8 adjuster screw shortens the retract end, while the extend end stays fixed; re-tighten the lock nut after setting. 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 or rod lock for fail-safe holding.
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