Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-20S
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-20S 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 20mm fine-adjustable window — settable from 105 to 125mm, so you set the end position without changing hardware.
- BoreØ10 mm
- Nominal stroke125 mm
- Adjust window20 mm
- Effective range105–125 mm
- Port sizeM5×0.8
- Acting typeDouble acting
About the Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-20S
The AirTAC PBJ10X125-20S is a double-acting pen-size mini cylinder with a 20 mm adjustable stroke window, yielding an effective range of 105 to 125 mm. A rear adjuster screw shortens the retract end so you can fine-tune travel on the machine. The extend end remains fixed. This 125 mm stroke exceeds the 100 mm standard maximum for this 10 mm bore, making it a non-standard, made-to-order item.
Force is identical to a standard PB cylinder of the same bore, delivering 39.3 N push and 33 N pull at 0.5 MPa. The slim SUS304 stainless body includes a fixed TPU bumper at each end and a built-in piston magnet for reed or electronic switches. The M5x0.8 air port and Ø4 mm rod keep the profile compact for tight jigs.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-20S Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-20S |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø10 mm |
| Rod diameter | Ø4 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 20 mm (105–125 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 PBJ10X125-20S
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 10 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -20 | 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 PBJ10X125-20S Is Used
Changeover Fixtures
Dial in the retract stop on the fly when swapping product families, eliminating the need to physically swap cylinders for each new part height.
Trial Stops
Iterate extend-and-retract positioning during prototype runs to find the exact travel distance before locking the lock nut for production.
Variable-Depth Insert
Regulate the back position for different press-in depths on a single head, keeping the fixed extend end as a hard mechanical reference.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ10X125-20S the Right Cylinder?
At 0.5 MPa this 10 mm bore yields 39.3 N push, so plan a safe working load of roughly 24 N (about 60 percent of theoretical) to account for seal friction. For heavier cycles, step up to the 12 mm bore (56.5 N push) or drop to a fixed-stroke PB if field tuning is unnecessary. Remember the rear screw only alters the retract position; the extend stroke is fixed.
After setting your travel, re-tighten the lock nut to prevent vibration drift. The Ø4 mm rod is slender over a 125 mm stroke, so add an external guide for off-axis loads. Confirm your ordering essentials: 10 mm bore, 125 mm stroke, 20 mm window, S magnet, and mounting.
Quick checklist
- ✓ Need to fine-tune the end position on site
- ✓ Retract end sits within 105–125 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 PBJ10X125-20S FAQ
The effective stroke range is 105 to 125 mm. At 0.5 MPa it provides 39.3 N push and 33 N pull. At the 0.7 MPa maximum it provides 55 N push and 46.2 N pull. Adjusting the travel does not alter these force outputs.
A rear adjuster screw (M4x0.7 thread) shortens the retract end by up to 20 mm, while the extend end is fixed. You must re-tighten the lock nut after setting to prevent vibration drift. The built-in magnet works with reed or electronic switches.
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Related AirTAC PBJ Pen-Size Cylinders
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