Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50S
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50S 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 PBJ16X125-50S
The AirTAC PBJ16X125-50S is a double-acting, adjustable-stroke pen-size mini cylinder with a built-in magnet. A rear adjuster screw and lock nut shorten the retract end, giving an effective stroke range of 75-125 mm from a 125 mm nominal length. The extend end remains fixed. It delivers 100.5 N push and 90.7 N pull at 0.5 MPa, matching standard PB force exactly. The M5x0.8 air port and Ø5 mm stainless rod suit tight jigs.
The slim SUS304 stainless body includes a fixed TPU bumper at each end. Plan for a safe working load of about 60 N, which is roughly 60% of the 0.5 MPa push rating, to account for seal friction. For vertical lifts, expect to raise about 5.1 kg with a 2:1 safety margin. The Ø5 mm piston rod handles coaxial thrust well, but over this 125 mm stroke an external guide prevents side-load wear.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50S Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50S |
|---|---|
| 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 PBJ16X125-50S
| 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 PBJ16X125-50S Is Used
Changeover Fixtures
Dial in the retract stop from 75 to 125 mm during product changeovers, locking the nut to secure the new position without swapping hardware.
Trial Insertion Stops
Test variable insertion depths on prototypes by turning the rear screw, finding the exact position before committing to a fixed-length cylinder.
Vertical Lift Jigs
Lift up to 5.1 kg vertically using the 16 mm bore, relying on the external guide to support the Ø5 mm rod over the 125 mm extension.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-50S the Right Cylinder?
For sizing, the adjacent bore down is 12 mm, offering 56.5 N push at 0.5 MPa, while this 16 mm bore provides 100.5 N. If you need less force, step down, but choose this 16 mm model if your load approaches 60 N of real work. Remember that only the retract position is field-settable; the extend end is fixed. Always re-tighten the M5x0.8 adjuster lock nut after tuning to prevent vibration drift. Confirm your bore, 125 mm stroke, 50 mm window, S magnet, and mounting accessories before ordering.
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 PBJ16X125-50S FAQ
It provides 100.5 N push and 90.7 N pull at 0.5 MPa, and 140.7 N push and 126.9 N pull at the 0.7 MPa maximum. The adjustable window is 50 mm, yielding an effective stroke range of 75-125 mm. The air port is M5x0.8.
The rear screw shortens only the retract end, while the extend end remains fixed. You must re-tighten the lock nut after setting to prevent vibration drift. The S magnet works with AirTAC reed or electronic switches for position sensing.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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Related AirTAC PBJ Pen-Size Cylinders
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