Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ50X125-40
The AirTAC Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ50X125-40 is a genuine double-acting aluminum-barrel mini cylinder with a Ø50mm bore, a 125mm nominal stroke and a rear adjustable-stroke stopper — trim up to 40mm for a usable window of 85–125mm. Fixed rubber bumper.
- BoreØ50 mm
- Stroke125 mm
- Adjustable85–125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM14×1.5
- 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 MBLJ50X125-40
The AirTAC MBLJ50X125-40 is a double-acting aluminum mini cylinder featuring a rear travel stopper that trims up to 40 mm of stroke, creating a precise usable end-position window of 85-125 mm. Delivering 981 N push and 881 N pull at 0.5 MPa, it suits mid-weight positioning tasks. The Ø16 mm carbon-steel rod has 20 um hard-chrome plating, and the riveted rolling-packed barrel uses a grease-retaining piston seal for long service life.
This SKU is configured with a PT tapered port thread and has NO built-in magnet, meaning it cannot host CMSG, DMSG, or EMSG position sensors. A fixed rubber bumper absorbs end-of-stroke impact, while the rear adjuster acts purely as a mechanical travel stop and does not lock the load without live air pressure. Its overall length equals A + 2 x 125 + 40 mm, making it physically longer than a fixed MBL variant.
Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ50X125-40 Technical Specifications
| Model | Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ50X125-40 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 85–125 mm (trim 40 mm) |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M14×1.5 |
| 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 500 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 881 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 MBLJ50X125-40
| MBLJ | MBLJ aluminum-barrel adjustable-stroke mini cylinder. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -40 | 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 MBLJ50X125-40 Is Used
Packaging Carton Flap Folding
Adjusts the folding arm stroke from 85 to 125 mm on the fly to accommodate varying corrugated box heights, utilizing the 981 N push force without changing hardware.
Assembly Line Pin Insertion
Dials in the exact 85-125 mm insertion depth for press-fitting dowel pins, relying on the 881 N pull force to retract the tooling safely.
Textile Fabric Edge Guiding
Trims the guide roller stroke window to align fabric webs during roll changes, where the fixed rubber bumper handles the rapid repetitive end impacts.
Is the Airtac MBLJ Adjustable Aluminum Alloy Mini Cylinder MBLJ50X125-40 the Right Cylinder?
Stepping down to the 40 mm bore yields 628 N push at 0.5 MPa, whereas stepping up to the 63 mm bore provides 1558 N. Choose this 50 mm model when your changeover requires a 981 N force profile with a variable 85-125 mm reach. If your application needs adjustable air cushions rather than a fixed rubber bumper, select the MBLCJ variant; for fixed-length strokes without the rear screw, use the standard MBL.
The rear stopper sets the end position but will not hold the load pneumatically—use an external locking device if position holding is required without air. Mounting is limited to Basic, FA flange, or LB foot styles, as MBLJ excludes back-cover and SDB pivot options. For exact replacements, match the 50 mm bore, 125 mm stroke, 40 mm adjust code, G1/4 port, PT thread, and confirm the absence of the S magnet code.
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 MBLJ50X125-40 FAQ
At 0.5 MPa it provides 981 N push and 881 N pull. At 0.7 MPa push increases to 1374 N. The maximum theoretical force is 200 kgf at 1.0 MPa.
The rear stopper allows you to trim the stroke end position back by up to 40 mm, giving a usable travel window of 85-125 mm. It functions only as a travel stop and does not lock the load without live air.
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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.
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