Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20 is a genuine double-acting aluminum-barrel mini cylinder with a Ø25mm bore, a 125mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 105–125mm. Adjustable air cushion (both ends).
- BoreØ25 mm
- Stroke125 mm
- Adjustable105–125 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20
The AirTAC MBLCJ25X125-20 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and tunable air cushions at both ends. It delivers 245 N push and 206 N pull force at 0.5 MPa. The rear stopper allows you to trim up to 20 mm of travel, creating a precise 105-125 mm usable stroke window. This is ideal for applications requiring exact end-positioning without swapping the entire actuator.
Unlike the standard MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable pneumatic cushioning to decelerate loads smoothly at the stroke extremes, protecting the end covers during faster cycles. The riveted rolling-packed aluminum barrel and 20 µm hard-chrome plated carbon-steel rod (Ø10 mm) ensure durability. Note that this specific SKU lacks the -S magnet option, so it cannot support CMSG, DMSG, or EMSG electronic position sensors. The rear adjuster sets the travel end and the cushion governs deceleration, but neither acts as a mechanical lock to hold a load in place without continuous air pressure.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø25 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 105–125 mm (trim 20 mm) |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M10×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable air cushion (both ends) |
| Max standard stroke | Up to 300 mm |
The rear stopper sets the end position — it is a travel stop, not a lock. Overall length = A + 2 × stroke + adjustable stroke. MBLJ/MBLCJ mounting is Basic / FA / LB only (no SDB, no back-cover code). Thread options: PT / G / NPT.
Theoretical Output Force (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | — |
| Max (@1.0 MPa) | 50 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a margin.
Model Code: Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 25 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -20 | Adjustable-stroke amount (mm you can trim at the rear). |
| S | Optional built-in magnet for a CMSG/DMSG/EMSG sensor switch. |
Related: MBLJ (adjustable stroke, fixed bumper), MBL (fixed stroke), MBLD (double rod).
Where the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20 Is Used
PCB Drill Bit Changer
Provides the 245 N force and 105-125 mm adjustable stroke needed to index drill bits in CNC routing machines, with air cushions preventing shock at the tool changer.
Label Applicator Tamp
Accurately tamps labels onto packaging cartons, using the 20 mm rear stroke trim to compensate for varying carton heights without adding spacers.
Textile Yarn Guide
Traverses yarn guides across a 125 mm path in looms; the tunable end-cushioning slows the 30-800 mm/s traverse to protect delicate fibers from snapping.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20 the Right Cylinder?
With a 245 N push force at 0.5 MPa, this 25 mm bore suits moderate-duty handling. If your application requires less force, stepping down to the 20 mm bore yields 157 N push; if you need more clamping power, the 32 mm bore provides 402 N. Choose the MBLCJ over the MBLJ when your cycle speeds demand tunable pneumatic cushioning rather than a fixed bumper, or over the MBLC when you need that rear travel-stop adjustment to fine-tune the 105-125 mm window.
When replacing this unit, match the 25 mm bore, 125 mm stroke, 20 mm adjust code, G1/8 port, PT thread, and Basic mounting (no FA/LB/SDB or back-cover options exist for this series). Keep in mind the adjuster is a travel stop, not a brake, so external guides are recommended for the 125 mm stroke to prevent rod bending under side loads.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Adjustable window fits your end position
- ✓ Adjuster is a travel stop, not a lock
- ✓ Magnet (S) for sensors?
- ✓ Side load — add a guide on long strokes
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear stopper for the end position (a travel stop, not a lock).
- check Avoid side load; add an external guide on long strokes.
- check Mounting: Basic / FA flange / LB foot (no SDB, no back-cover code).
- check Installation by qualified personnel per AirTAC docs.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20 FAQ
At 0.5 MPa, this 25 mm bore cylinder provides 245 N push and 206 N pull force. At 0.7 MPa, the push increases to 343 N. The maximum theoretical force is 50 kgf at 1.0 MPa, with an operating pressure range of 0.15-1.0 MPa.
The 20 mm rear adjuster mechanically limits the stroke, creating a 105-125 mm travel window, while the adjustable air cushion uses screws to tune pneumatic deceleration at the stroke ends. Neither feature locks or holds the load; the rod will drift without live air pressure, requiring an external locking mechanism for static holding.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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