Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20S is a genuine double-acting aluminum-barrel mini cylinder with a Ø40mm bore, a 300mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 280–300mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke300 mm
- Adjustable280–300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20S
The AirTAC MBLCJ40X300-20S 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 of push force and 528 N of pull force at 0.5 MPa, making it well-suited for moving moderate masses across long 300 mm travels. The rear adjuster allows you to trim up to 20 mm of travel, creating a precise usable stroke window of 280-300 mm.
Unlike the base MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable air cushions to decelerate the piston near each end-cap, absorbing kinetic energy from heavy loads at high speeds to prevent cover damage. The riveted rolling-packed aluminum barrel pairs with a heterogeneous two-way grease-retaining piston seal to maintain consistent lubrication over the 30-800 mm/s speed range. Additionally, the Ø16 mm carbon-steel rod features 20 µm hard-chrome plating for scratch and corrosion resistance. The built-in magnet (-S) enables position detection with CMSG reed or DMSG/EMSG solid-state sensors.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 280–300 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 MBLCJ40X300-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 MBLCJ40X300-20S Is Used
CNC Pallet Changer
Exchanges 628 N aluminum machining pallets over a 300 mm travel, using the adjustable cushion to stop the heavy fixture smoothly without shocking the machine base.
Cardboard Stacker Arm
Pushes corrugated sheets into a forming head, trimming 20 mm at the rear adjuster to sync the 280 mm end position precisely with the packaging folder.
PCB Shuttle Conveyor
Transfers loaded PCB magazines between inspection lanes, relying on the -S magnet and DMSG solid-state sensors to trigger deceleration before the end-of-stroke cushion engages.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20S the Right Cylinder?
If you need less force, stepping down to the 32 mm bore yields 402 N of push force at 0.5 MPa, whereas stepping up to the 50 mm bore provides 981 N for heavier payloads. Choose the MBLCJ over the MBLJ when your application's velocity requires active pneumatic deceleration rather than a passive rubber bumper, or over the MBLC if your design needs variable end-positioning rather than a fixed stroke. Because this 300 mm stroke approaches the maximum standard travel for this bore, the small 16 mm rod is highly susceptible to bending under lateral loads; always use an external guide rail to prevent rod damage.
Remember that the rear stroke adjuster is strictly a travel stop, and the cushion only decelerates motion—neither mechanism will hold a load in place without live air pressure, so a separate locking device is required for fail-safe positioning. Mounting is limited to Basic, FA flange, or LB foot styles, as this series omits back-cover and SDB pivot options. To replace this SKU exactly, match the 40 mm bore, 300 mm stroke, 20 mm adjust code, G1/4 port, PT thread, and the -S magnet specification.
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 MBLCJ40X300-20S FAQ
At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa the push force is 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa, with a proof pressure of 1.5 MPa.
The rear adjustable stroke is a mechanical travel stop that trims the end position by up to 20 mm (creating a 280-300 mm usable window), whereas the adjustable air cushion uses a needle screw to tune pneumatic deceleration near the stroke ends. Neither holds a load in place; both require live air pressure to function.
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