Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40S
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40S 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 40mm fine-adjustable window — settable from 85 to 125mm, so you set the end position without changing hardware.
- BoreØ16 mm
- Nominal stroke125 mm
- Adjust window40 mm
- Effective range85–125 mm
- Port sizeM5×0.8
- Acting typeDouble acting
About the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40S
The AirTAC PBJ16X125-40S is a double-acting, single-rod pen-size mini cylinder with a 40mm adjustable window. A rear adjuster screw and lock nut shorten the retract end, yielding an effective stroke range of 85mm to 125mm. The extend end remains fixed. Output force matches the standard PB series of the same bore, giving 100.5N push and 90.7N pull at 0.5MPa.
The Ø5mm stainless rod and barrel suit tight jigs and light end-of-arm tooling. Air connects via an M5x0.8 port, and the rod-end thread is M10x1.0. A fixed TPU bumper cushions each end. The built-in magnet works with reed or electronic switches. Good practice loads a cylinder to roughly 60% of theoretical force, so plan for about 60N of real work at 0.5MPa. With a 2:1 margin, this lifts about 5.1kg vertically.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40S Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40S |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø16 mm |
| Rod diameter | Ø5 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 40 mm (85–125 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 PBJ16X125-40S
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 16 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -40 | 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 PBJ16X125-40S Is Used
Changeover Fixtures
Set the exact retract length on the machine during product changeovers without swapping hardware.
Trial Stops
Dial in a precise end position for prototyping and trial stops before finalizing a mechanical layout.
Variable-Depth Insert
Adjust insertion depth on the fly for different part heights using the 85-125mm effective range.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-40S the Right Cylinder?
This 16mm bore provides 100.5N push at 0.5MPa. Stepping down to a 12mm bore yields 56.5N push, while a larger 16mm bore offers the same 100.5N. When sizing, remember the rear screw only alters the back position; the extend end is fixed. Always re-tighten the lock nut after setting your 85-125mm range, as vibration can drift an unlocked screw. Confirm your ordering essentials: bore, stroke, window, magnet S, and mount.
Quick checklist
- ✓ Need to fine-tune the end position on site
- ✓ Retract end sits within 85–125 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 PBJ16X125-40S FAQ
The effective stroke range is 85-125mm. At 0.5MPa, push is 100.5N and pull is 90.7N. At the 0.7MPa maximum, push is 140.7N and pull is 126.9N. Adjusting the stroke does not change these forces.
The rear screw shortens the retract end only; the extend end is fixed. You must re-tighten the lock nut after setting your desired length to prevent vibration drift. The adjuster thread is M5x0.8.
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Related AirTAC PBJ Pen-Size Cylinders
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