Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-20
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-20 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 20mm for a usable window of 105–125mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke125 mm
- Adjustable105–125 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 MBLCJ20X125-20
The AirTAC MBLCJ20X125-20 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. A G1/8 port drives an 8mm rod to deliver 157N push and 132N pull force at 0.5 MPa. The rear stopper allows you to trim up to 20mm of travel, creating a usable stroke window of 105-125mm for precise end-positioning.
This SKU is built without a magnetic piston, meaning it cannot accept CMSG, DMSG, or EMSG position sensors. The riveted rolling-packed barrel and grease-retaining two-way seal minimize friction for speeds up to 800mm/s. The tunable cushioning decelerates the rod near the end caps to absorb impact, which is critical for protecting the compact 20mm body during fast cycling.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-20 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-20 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 105–125 mm (trim 20 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 MBLCJ20X125-20
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | 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 MBLCJ20X125-20 Is Used
PCB Router Z-Axis
Drives a light spindle carriage with a 105-125mm stroke window, using the tunable air cushion to soften stops and protect the 8mm rod during rapid routing cycles.
Dispenser Valve Actuation
Positions a fluid dispensing nozzle over a moving conveyor, trimming the rear stroke by 20mm to hit exact shot volumes without mechanical spacers.
Small-Part Ejector
Pushes stamped electronic contacts out of a die with 157N of push force at 0.5 MPa, relying on the adjustable cushion to prevent end-cap damage during ejection.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X125-20 the Right Cylinder?
Stepping down to a 20mm bore yields 157N of push force at 0.5 MPa; if your payload is lighter, the 12mm bore offers less force, while stepping up to the 25mm bore provides 245N. Choose the MBLCJ over the MBLJ when your moving mass requires tunable end-of-stroke deceleration rather than a fixed rubber bumper. If your stroke length is fixed, the MBLC variant drops the rear adjuster entirely.
Replacement requires matching the 20mm bore, 125mm stroke, 20mm adjust code, G1/8 PT thread, and Basic mounting. Note that the rear adjuster is a travel stop, not a lock—it will not hold a load without live air pressure. Mounting is limited to Basic, FA, or LB; no SDB or back-cover options exist. At 125mm of travel on an 8mm rod, external guides are recommended to prevent side-load rod bending.
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 MBLCJ20X125-20 FAQ
At 0.5 MPa, this 20mm bore cylinder provides 157N push and 132N pull force. At 0.7 MPa, push increases to 220N. The maximum theoretical force is 32 kgf at 1.0 MPa.
This specific SKU lacks a built-in magnet, so it cannot accept CMSG, DMSG, or EMSG position sensors. The rear 20mm adjuster is a travel stop that sets the end position, not a lock; it will not hold a load without live air. The adjustable air cushion only decelerates the stroke end.
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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.
Fast Reply
Most inquiries answered within 7-8 hours.
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