Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-40
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-40 is a genuine double-acting aluminum-barrel mini cylinder with a Ø20mm bore, a 125mm nominal stroke and a rear adjustable-stroke stopper — trim up to 40mm for a usable window of 85–125mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke125 mm
- Adjustable85–125 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
- 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 MBLCJ Adjustable Mini Cylinder MBLCJ20X125-40
The AirTAC MBLCJ20X125-40 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. It delivers 157 N of push force and 132 N of pull force at 0.5 MPa. The rear stopper allows you to trim up to 40 mm of travel, creating a usable extension window of 85 to 125 mm. This 125 mm stroke suits longer linear transfers in tight spaces where standard lengths fall short.
Unlike the fixed rubber bumper found on the base MBLJ, the screw-tunable air cushion on this unit lets you dial in end-of-stroke deceleration for faster cycling while protecting the end covers. The 8 mm carbon-steel rod features 20 µm hard-chrome plating to resist scoring, and the riveted rolling-packed barrel ensures structural rigidity. Because this specific SKU lacks the -S magnet option, it cannot accept CMSG, DMSG, or EMSG position sensors.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-40 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-40 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 85–125 mm (trim 40 mm) |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M8×1.25 |
| 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 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 MBLCJ20X125-40
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | 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: MBLJ (adjustable stroke, fixed bumper), MBL (fixed stroke), MBLD (double rod).
Where the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-40 Is Used
PCB Edge Router Feed
Pushes a printed circuit board panel into a depaneling router at a precise 100 mm stop (trimmed from 125 mm), using the tunable cushion to prevent bounce on lightweight fiberglass substrates.
Microfluidic Valve Indexing
Drives a small rotary indexer for microfluidic manifold testing, relying on the 157 N push force to seat the manifold while the air cushion protects the delicate valve seats at cycle completion.
Thin Film Spool Tensioning
Acts as a moving guide for a thin-film spooling machine, where the 85-125 mm adjustable window accommodates varying roll widths without swapping the entire actuator assembly.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-40 the Right Cylinder?
Step down to the 12 mm bore class if your load requires under 90 N of push force, or step up to the 25 mm bore (245 N push at 0.5 MPa) if you need to overcome higher friction. The MBLCJ20X125-40 is ideal when you need both end-position tuning and impact absorption. If you only need to limit travel and can tolerate hard bumper stops, the MBLJ saves complexity; if your travel is fixed, the MBLC removes the rear adjuster for a shorter footprint.
Remember that the 40 mm rear adjuster is a travel stop, not a mechanical lock—it cannot hold a load in place without continuous air pressure. The cushion only decelerates the piston; it does not brake the load. Mounting is limited to Basic, FA flange, or LB foot styles, as this series uses no back-cover or SDB pivot options. The exact replacement match is bore 20, stroke 125, adjust 40, G1/8 port, PT thread, no magnet.
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 MBLCJ20X125-40 FAQ
At 0.5 MPa, this 20 mm bore cylinder outputs 157 N push and 132 N pull. At 0.7 MPa, the push force increases to 220 N. The maximum theoretical force is 32 kgf at 1.0 MPa. The operating pressure range is 0.15 to 1.0 MPa.
The adjustable stroke uses the 40 mm rear stopper to mechanically limit the extension endpoint, giving you a usable travel window of 85 to 125 mm. The adjustable air cushion uses a screw to meter trapped air at the stroke ends to decelerate the piston. Neither feature locks or holds the load in place without live air pressure.
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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.
Related AirTAC Adjustable-Stroke Cylinders
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