Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-20S is a genuine double-acting aluminum-barrel mini cylinder with a Ø40mm bore, a 40mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 20–40mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke40 mm
- Adjustable20–40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-20S
The AirTAC MBLCJ40X40-20S is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. It delivers 628 N push force at 0.5 MPa via a G1/4 port and a Ø16 hard-chrome plated carbon-steel rod. The rear stopper allows you to trim up to 20 mm of travel, creating a usable stroke window of 20-40 mm for precise intermediate positioning.
This model includes a built-in magnet (-S) for solid-state DMSG or EMSG and reed CMSG sensor switches. The riveted rolling-packed aluminum barrel and grease-retaining piston seal ensure durability. The adjustable air cushion provides screw-tunable deceleration to protect the end covers during fast moves, which is a distinct advantage over the fixed rubber bumper found on the MBLJ series.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 40 mm |
| Adjustable window | 20–40 mm (trim 20 mm) |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 MBLCJ40X40-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 MBLCJ40X40-20S Is Used
PCB Router Z-Axis
Drives a light spindle on a printed circuit board depaneling router, using the 20-40 mm stroke window to set exact cutting depth while the air cushion prevents end-cover impact during rapid retraction.
Dispenser Valve Dosing
Actuates a pneumatic shot dispenser valve for epoxy, relying on the 628 N push force to overcome fluid pressure and the rear stopper to consistently trim the dispense stroke down to 20 mm.
Textile Creel Tensioning
Applies constant 528 N pull force to a yarn tensioning arm in a textile creel, using the built-in magnet to confirm fully retracted status to the PLC.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-20S the Right Cylinder?
At 0.5 MPa, this 40 mm bore yields 628 N push and 528 N pull. If your application requires less force, consider stepping down to the 32 mm bore (402 N push), or if you need more power, step up to the 50 mm bore (981 N push). Choose the MBLCJ over the MBLJ when your cycle speed demands tunable end-of-stroke deceleration rather than a fixed bumper, or over the MBLC when you need that rear travel stopper.
Remember that the rear adjuster is a travel stop, not a lock, and the air cushion only decelerates; neither will hold a load in place without continuous air pressure. Mounting is limited to Basic, FA, or LB styles, as no SDB pivot or back-cover option exists for this series. To replace this exact unit, match the 40 mm bore, 40 mm stroke, 20 mm adjust code, G1/4 port, PT thread, and the -S 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 MBLCJ40X40-20S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N push and 528 N pull force. At 0.7 MPa, the push force increases to 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa.
The rear adjuster physically stops the piston to trim travel within a 20-40 mm window, but it does not lock or hold the load without air pressure. The adjustable air cushion only regulates end-of-stroke deceleration speed via a screw, protecting the covers without braking the load.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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Most inquiries answered within 7-8 hours.
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