Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20S
The AirTAC Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20S is a double-acting, double-rod pen-size mini cylinder whose rear rod carries a stroke adjuster. On a Ø16mm 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.
- BoreØ16 mm
- Nominal stroke125 mm
- Adjust window20 mm
- Effective range105–125 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 PBJ16X125-20S
The AirTAC PBJ16X125-20S is a double-acting, double-rod pen-size mini cylinder with a 16mm bore and a 125mm nominal stroke. A rear adjuster screw and lock nut let you shorten the retract end, giving an effective stroke range of 105-125mm. The extend end remains fixed.
This slim SUS304 stainless build includes a built-in piston magnet for reed or electronic switches. The M5x0.8 air port and fixed TPU bumper suit tight jigs. Because the rod is only 5mm thick, add an external guide for off-axis loads over this long stroke. The bumper only decelerates the last few mm, so meter-out the exhaust or add a shock absorber when cycling real tooling mass at higher speeds.
Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20S Technical Specifications
| Model | Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20S |
|---|---|
| Series | PBJ JIS pen-size adjustable-stroke cylinder |
| Bore size | Ø16 mm |
| Rod diameter | Ø5 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 20 mm (105–125 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 |
PBJ is a double-rod cylinder: the rear rod carries the stroke adjuster, which sets the stroke end within the adjustable window. Confirm the set position against the product label before installation.
Theoretical Output Force (Ø16mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 90.7 N | 90.7 N |
| 0.7 MPa (max) | 126.9 N | 126.9 N |
The rear rod passes through the rear cover, so both piston faces lose rod area: push is shown at the annular-area value (conservative), lower than a single-rod PB push of the same bore. Size with a friction margin.
Model Code: Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20S
| PBJ | JIS pen-size adjustable-stroke mini-cylinder series. |
|---|---|
| 16 | 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 PBJ16X125-20S Is Used
Changeover Fixtures
Dial in the retract stop from 105 to 125mm during product changeovers without machining new hard stops.
Trial Insertion Stops
Fine-tune insertion depth on test jigs by adjusting the rear screw, then lock the nut for repeatable cycles.
Variable Depth Pressing
Set precise end positions for light pressing tasks using the 140.7N max push force at 0.7MPa.
Is the Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20S the Right Cylinder?
Stepping down to a 12mm bore drops the push to 56.5N, while stepping up is unavailable as 16mm is the largest PBJ option.
Remember that only the retract position is field-settable; the extend end is fixed. After dialing in the 105-125mm range, re-tighten the M5x0.8 adjuster lock nut to prevent vibration drift. Confirm your ordering essentials: 16mm bore, 125mm stroke, 20mm window, S magnet, and any LB or FA mount.
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 Double rod: the rear rod carries the stroke adjuster.
- 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 PBJ16X125-20S FAQ
The effective stroke range is 105-125mm. At 0.5MPa, push force is 100.5N and pull is 90.7N. At the 0.7MPa maximum, push is 140.7N and pull is 126.9N.
A rear screw shortens only the retract end; the extend end is fixed. You must re-tighten the lock nut after setting to prevent vibration drift. The S option adds a piston magnet compatible with reed or electronic switches.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC PBJ Pen-Size Cylinders
Request a Quote for Airtac PBJ Adjustable Pen-Type Cylinder PBJ16X125-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.