Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ25X125-20S
The AirTAC Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ25X125-20S 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. Fixed rubber bumper.
- BoreØ25 mm
- Stroke125 mm
- Adjustable105–125 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- CushionFixed rubber bumper
- 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 MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ25X125-20S
The AirTAC MBLJ25X125-20S is a compact double-acting aluminum mini cylinder featuring a rear adjustable stroke. A built-in stopper lets you trim up to 20mm of travel, creating a precise usable end-position window from 105 to 125mm without external stops. Driven by a Ø10mm carbon-steel rod with 20µm hard-chrome plating, it generates 245N push and 206N pull force at 0.5 MPa. The riveted rolling-packed barrel and heterogeneous two-way grease-retaining piston seal ensure stable friction for millions of cycles.
This SKU includes a built-in magnet (-S) for CMSG reed or DMSG/EMSG electronic sensor switches to track rod position. It uses a fixed rubber bumper to soften end impacts, meaning only the stroke length is adjustable, not the cushioning. The rear adjuster acts purely as a travel stop to set the end position; it does not lock or hold the load without continuous air pressure.
Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ25X125-20S Technical Specifications
| Model | Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ25X125-20S |
|---|---|
| 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 | Fixed rubber bumper |
| 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 MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ25X125-20S
| MBLJ | MBLJ aluminum-barrel adjustable-stroke mini cylinder. |
|---|---|
| 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: MBLCJ (adjustable stroke, adjustable cushion), MBL (fixed stroke), MBLD (double rod).
Where the Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ25X125-20S Is Used
Labeler Turret Indexing
Fine-tunes the 105-125mm push stroke on a rotary labeling machine turret during product format changeovers, using the 245N force to press labels securely onto varying container diameters.
Packaging Flap Folding
Adjusts the end-stop position by up to 20mm to fold carton flaps of different heights, ensuring the 206N pull force snaps the flap into place without crushing the cardboard.
PCB Test Fixture Probe
Uses the -S magnet with a DMSG electronic sensor to verify the extended probe position, while the rear adjuster precisely sets the 125mm stroke to avoid over-traveling and damaging delicate test pins.
Is the Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ25X125-20S the Right Cylinder?
Stepping down, the Ø20 bore provides 157N push at 0.5 MPa for lighter loads, while stepping up to the Ø32 bore yields 402N push for heavier pushing forces. Choose this MBLJ over a fixed-stroke MBL when your machine commissioning requires fine-tuning the retract or extend end-position within that 105-125mm window. If your application suffers from high kinetic energy at the end of stroke and needs adjustable pneumatic cushioning rather than a fixed rubber bumper, select the MBLCJ variant instead.
For exact replacements, match the Ø25 bore, 125mm nominal stroke, 20mm adjust code, G1/8 port, PT thread, and the -S magnet. Mounting is limited to Basic, FA flange, or LB foot; there is no SDB pivot or back-cover option. Because the overall length equals A + 2 x stroke + adjust, this cylinder is physically longer than a plain MBL. At 125mm stroke, the small 10mm rod is susceptible to side-load bending; use an external guide rail to prevent rod damage.
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 MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ25X125-20S FAQ
At 0.5 MPa, the push force is 245N and the pull force is 206N. At 0.7 MPa, the push force increases to 343N. The maximum theoretical force is 50 kgf at the 1.0 MPa operating pressure limit.
The rear screw stopper allows you to trim the travel back by up to 20mm, giving a usable stroke window of 105 to 125mm. This adjuster is a mechanical travel stop that sets the end position; it is not a lock and will not hold the load if air pressure is removed.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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