Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-40
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-40 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 40mm for a usable window of 260–300mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke300 mm
- Adjustable260–300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-40
The AirTAC MBLCJ40X300-40 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and a tunable air cushion at both ends. It delivers 628 N push and 528 N pull at 0.5 MPa. The rear stopper lets you trim up to 40 mm of travel, creating a precise 260-300 mm usable stroke window for varying end positions. A G1/4 port and Ø16 hard-chrome plated carbon-steel rod handle robust pneumatic demands.
Unlike the fixed rubber bumper on an MBLJ, the screw-tunable end cushions actively decelerate heavy loads over this long 300 mm stroke, protecting the end covers from impact. Note this SKU lacks a built-in magnet (-S), so it cannot accept CMSG or DMSG position sensors. The riveted rolling-packed barrel and grease-retaining piston seal ensure consistent friction even at speeds up to 800 mm/s. Overall length equals A + 2 x stroke + adjust.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-40 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-40 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 260–300 mm (trim 40 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 MBLCJ40X300-40
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 MBLCJ40X300-40 Is Used
CNC Pallet Changer
Pushes 300 mm to index heavy machining pallets; the air cushion absorbs the 628 N kinetic impact at the stroke end, while the 40 mm trim dials in the exact docking position.
Packaging Folder Arm
Actuates a carton folding arm where the 260-300 mm adjustable window fine-tunes the fold depth without remounting the cylinder, handling the 528 N retract load smoothly.
Wood Router Feed Stop
Sets a dynamic material stop on a high-speed routing line; the tunable cushion prevents bounce when the 880 N @0.7 MPa extension force hits the end cover.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-40 the Right Cylinder?
Step down to the 32 mm bore (402 N push @0.5 MPa) for lighter loads, or step up to the 50 mm bore (981 N push @0.5 MPa) when you need greater thrust. Choose MBLCJ over MBLJ when your moving mass requires active end-of-stroke deceleration rather than a passive bumper. Choose MBLC over MBLCJ if your travel length is fixed and you do not need the 40 mm rear trim window.
The rear adjuster sets the travel end point but does not lock or hold the load; external guide rails must manage side loads, especially at 300 mm stroke. Mounting is limited to Basic, FA flange, or LB foot—no SDB pivot or back-cover options exist. Exact replacement requires: 40 mm bore, 300 mm stroke, 40 mm adjust code, G1/4 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 MBLCJ40X300-40 FAQ
At 0.5 MPa it provides 628 N push and 528 N pull. At 0.7 MPa the push force is 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa operating pressure.
The adjustable stroke is a rear mechanical stopper that trims your usable travel window down to 260 mm from the 300 mm nominal length. The adjustable air cushion is a separate needle valve that regulates end-of-stroke deceleration. Neither feature locks or holds the load in place.
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