Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-40
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-40 is a double-acting pen-size mini cylinder with a rear adjuster screw that shortens the retract end of the stroke. On a Ø10mm 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.
- BoreØ10 mm
- Nominal stroke125 mm
- Adjust window40 mm
- Effective range85–125 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 PBJ10X125-40
The AirTAC PBJ10X125-40 is a double-acting, single-rod pen-size mini cylinder featuring a 40mm adjustable stroke window. A rear adjuster screw with an M4x0.7 thread shortens the retract end, yielding an effective stroke range of 85-125mm. You can tune the length on the machine without swapping hardware. The extend end remains fixed. A 125mm stroke exceeds the 100mm max standard for this 10mm bore, so this unit is non-standard and made-to-order.
Output force matches a standard PB cylinder of the same bore, meaning the adjuster carries zero force penalty. It delivers 39.3N push and 33N pull at 0.5MPa. The slim SUS304 stainless body and fixed TPU bumper suit tight jigs. Because the rod is a slender 4mm, add an external guide or linear bearing over this long stroke to prevent side-load damage. The air port is M5x0.8.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-40 Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-40 |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø10 mm |
| Rod diameter | Ø4 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 40 mm (85–125 mm) |
| Adjuster thread | M4×0.7 |
| 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 100 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 (Ø10mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 39.3 N | 33.0 N |
| 0.7 MPa (max) | 55.0 N | 46.2 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 PBJ10X125-40
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 10 | 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 PBJ10X125-40 Is Used
Changeover Fixtures
Dial in the retract end from 85 to 125mm during product changeovers to set new stop positions without machining new pins or ordering different cylinders.
Trial Stops
Prototyping jigs benefit from the 40mm adjustment window, letting engineers test various retracted positions rapidly before locking the M4x0.7 nut.
Variable-Depth Insert
Press or insert operations requiring a tunable 85-125mm stroke can fine-tune the tooling depth on the fly while retaining the full 39.3N push at 0.5MPa.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-40 the Right Cylinder?
For sizing context, a neighbouring 12mm bore yields 56.5N push at 0.5MPa, whereas a smaller bore offers less. This 10mm bore gives 39.3N push at 0.5MPa. Good practice loads a cylinder to roughly 60-70% of theoretical force for smooth travel, so plan for about 24N of real work at 0.5MPa. Vertically, it lifts about 2kg with a sane 2:1 margin.
Remember that only the retract end is adjustable; the extend position is fixed. Re-tighten the lock nut after setting the rear screw to prevent vibration drift. When ordering, confirm the bore, stroke, 40mm window, and mounting accessories (LB/FA). No magnet is specified here.
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 PBJ10X125-40 FAQ
The effective stroke range is 85-125mm (nominal 125mm minus up to 40mm). Force is identical to a standard PB 10mm bore: 39.3N push and 33N pull at 0.5MPa, and 55N push and 46.2N pull at the 0.7MPa maximum. The air port is M5x0.8.
The rear M4x0.7 screw shortens only the retract end; the extend end is fixed. You must re-tighten the lock nut after setting to prevent vibration drift. Also, a plain PB-type cylinder does not hold its load on air loss, so an external stop or rod lock is required for fail-safe holding.
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Related AirTAC PBJ Pen-Size Cylinders
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