Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30S 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 30mm for a usable window of 270–300mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke300 mm
- Adjustable270–300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30S
The AirTAC MBLCJ40X300-30S is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and tunable air cushions at both ends. The 30 mm rear trimmer creates a usable travel window of 270-300 mm, letting you dial in the exact extended position without machining spacers. Delivering 628 N of push force at 0.5 MPa, this 40 mm bore unit drives heavier jigs and workpieces while the riveted rolling-packed barrel keeps the overall footprint tight.
Unlike the standard MBLJ bumper, the screw-tunable end cushions let you regulate deceleration for fast 300 mm moves, protecting the end covers from impact. The built-in magnet (-S) supports CMSG reed and DMSG/EMSG electronic sensors for precise end-position detection. Note that the rear stopper sets the travel end but does not lock the load; a separate guide is needed for high side-load moments.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 270–300 mm (trim 30 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 MBLCJ40X300-30S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Nominal stroke length in mm. |
| -30 | 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 MBLCJ40X300-30S Is Used
CNC Pallet Transfer
Pushes loaded machining pallets along a conveyor at 0.5 MPa, using the 628 N thrust to overcome friction and the air cushions to stop the 300 mm travel smoothly without jarring the fixture.
Print Head Registration
Adjusts the rear stopper by up to 30 mm to fine-tune the extended registration gate position on a wide-format printer, while the DMSG electronic switch confirms the end position.
Injection Mold Ejection
Acts as a secondary parts ejector on a plastic molding line, using the tunable cushions to decelerate the 300 mm extraction stroke and prevent marking on hot, fragile components.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30S the Right Cylinder?
Choose this 40 mm bore when you need 628 N of thrust at 0.5 MPa. If your payload is lighter, step down to the 32 mm bore (402 N push); if you need more power, step up to the 50 mm bore (981 N push). Select MBLCJ over the MBLJ when your 300 mm stroke speed requires regulated deceleration rather than a fixed rubber bumper, or over the MBLC if you need the 30 mm rear position trim.
The rear adjuster is a travel stop, not a lock—the rod drifts without live air. Mounting is limited to Basic, FA flange, or LB foot (no SDB pivot or back cover). At a 300 mm stroke, the Ø16 mm rod is susceptible to bending under offset loads, so always use an external linear guide. Direct replacement match: 40 mm bore, 300 mm stroke, 30 mm adjust, G1/4 port, PT thread, magnet included.
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 MBLCJ40X300-30S 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.
The 30 mm rear adjuster is a mechanical travel stop that sets your usable stroke window between 270-300 mm. The adjustable air cushion only regulates end-of-stroke deceleration speed. Neither feature locks the rod or holds the load in place.
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Standard models usually ship in 3-4 days.
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