Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X250-20
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X250-20 is a genuine double-acting aluminum-barrel mini cylinder with a Ø25mm bore, a 250mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 230–250mm. Adjustable air cushion (both ends).
- BoreØ25 mm
- Stroke250 mm
- Adjustable230–250 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X250-20
The AirTAC MBLCJ25X250-20 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. You can trim up to 20 mm of travel at the rear, creating a usable extension window of 230-250 mm. Delivering 245 N of push force at 0.5 MPa, this unit is built for longer travel tasks requiring precise end-position tuning. The riveted rolling-packed barrel and 20 µm hard-chrome plated carbon-steel rod ensure durability in tight spaces.
Unlike the base MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable end-of-stroke deceleration to absorb kinetic energy, protecting the end covers during faster moves. The rear mechanism acts purely as a travel stop and does not lock the load. Note that this specific SKU lacks a built-in magnet, meaning it cannot support CMSG, DMSG, or EMSG position sensors. Additionally, the 250 mm stroke on a Ø10 mm rod means external guiding is recommended to prevent side-load bending.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X250-20 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X250-20 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø25 mm |
| Nominal stroke | 250 mm |
| Adjustable window | 230–250 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 MBLCJ25X250-20
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 25 | Bore size in mm. |
| ×250 | 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 MBLCJ25X250-20 Is Used
PCB Edge Conveyor Routing
Drives a 250 mm routing gate on a PCB conveyor, using the 230-250 mm window to precisely match board widths while the air cushion softens the high-speed gate closure.
Textile Loom Tensioner
Adjusts the yarn tensioner arm on a textile loom, relying on the 245 N push force and tunable end-deceleration to prevent sudden snags during rapid loom cycling.
Carton Flap Folder
Actuates a 250 mm flap-folding arm on a packaging line, utilizing the rear adjuster to dial the exact fold depth for varying carton sizes without repositioning the cylinder.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X250-20 the Right Cylinder?
Choose this 25 mm bore when you need 245 N push (206 N pull) at 0.5 MPa over a 250 mm travel window. If your application requires less force, step down to the 20 mm bore which provides 157 N push; if you need heavier lifting, step up to the 32 mm bore offering 402 N push. This MBLCJ variant is preferred over the MBLJ when your moving mass demands tunable air cushioning rather than a fixed bumper, and over the MBLC when you need to dial in the 230-250 mm end position. Remember that neither the cushion nor the rear stopper acts as a load lock—external holding mechanisms are required for pneumatic positioning. Mounting is limited to Basic, FA (flange), or LB (foot); no SDB pivot or back-cover options exist. For a direct replacement, match the 25 mm bore, 250 mm stroke, 20 mm adjust code, G1/8 PT port, and lack of an S magnet. Because the stroke is 250 mm on a 10 mm rod, always use an external guide 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 MBLCJ25X250-20 FAQ
At 0.5 MPa it provides 245 N push and 206 N pull force; at 0.7 MPa it pushes 343 N, with a theoretical maximum of 50 kgf at 1.0 MPa. The cylinder cannot hold position without live air as the rod will drift; the rear adjuster is only a travel stop and the cushion only decelerates.
The rear screw lets you trim up to 20 mm of travel, giving a usable stroke window of 230-250 mm. This is separate from the adjustable air cushion, which only tunes end-of-stroke deceleration. This specific SKU does not have a built-in magnet, so it cannot be fitted with CMSG, DMSG, or EMSG sensors.
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