Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20S 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 MBLCJ25X125-20S
The AirTAC MBLCJ25X125-20S is a compact double-acting mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. The rear stopper allows you to trim up to 20 mm of travel, creating a usable stroke window of 105-125 mm. Driven by a Ø10 mm carbon-steel rod with 20 um hard-chrome plating, it delivers 245 N of push force and 206 N of pull force at 0.5 MPa. This stroke length is well-suited for mid-range indexing on compact assembly machinery.
Unlike the base MBLJ which relies on a fixed rubber bumper, this MBLCJ variant uses screw-tunable end-of-stroke deceleration to absorb kinetic energy, allowing faster cycle speeds without slamming the end covers. The riveted rolling-packed aluminum barrel and heterogeneous two-way grease-retaining piston seal keep the unit lightweight and internally lubricated. Because this SKU includes the -S code, a built-in magnet is fitted, enabling position detection via AirTAC CMSG reed switches or DMSG and EMSG solid-state electronic sensors.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20S |
|---|---|
| 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 MBLCJ25X125-20S
| 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 MBLCJ25X125-20S Is Used
PCB Router Z-Axis
Lifts a high-speed spindle on a PCB depaneling router, using the 105-125 mm adjustable window to set the exact cutter clearance, while the tunable air cushion prevents bouncing at 800 mm/s.
Dispenser Shot Plunger
Actuates a metering valve for two-part epoxy, relying on the 245 N push force to overcome fluid viscosity and the rear stopper to dial in the exact dispense depth.
Textile Yarn Guide
Traverses a yarn guide bar across a loom beam, using the 125 mm stroke to distribute thread evenly while the cushioning softens the rapid reversal at each end.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-20S the Right Cylinder?
When sizing this cylinder, consider stepping down to a Ø20 bore if your load requires less force (157 N push at 0.5 MPa) or up to a Ø32 bore for heavier payloads (402 N push at 0.5 MPa). Choose the MBLCJ over the MBLJ when your moving mass demands tunable deceleration to prevent end-cover damage, or the MBLC if you need a fixed standard stroke without the 20 mm rear trim window. Remember that the rear adjuster is a travel stop and the air cushion only decelerates; neither function mechanically locks or holds the load in place—use an external locking device for position holding. Mounting is limited to Basic, FA flange, or LB foot styles, as this series omits the SDB pivot and back-cover options. For an exact replacement, match the Ø25 bore, 125 mm stroke, 20 mm adjust code, G1/8 PT port thread, and the -S magnet requirement.
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 MBLCJ25X125-20S FAQ
At 0.5 MPa, this Ø25 cylinder provides 245 N of push force and 206 N of pull force. At 0.7 MPa, the push force increases to 343 N. The theoretical maximum force is 50 kgf at 1.0 MPa.
The rear stroke adjuster is a mechanical travel stop that trims the active stroke from 125 mm down to 105 mm. The adjustable air cushion is a separate screw-tunable valve that regulates exhaust flow to decelerate the piston near the end covers. Neither feature locks or holds the load in place.
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