Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50 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 50mm for a usable window of 250–300mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke300 mm
- Adjustable250–300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50
The AirTAC MBLCJ40X300-50 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and a tunable air cushion at both ends. The rear stopper allows you to trim up to 50 mm of travel, creating a usable stroke window of 250-300 mm. Driven by a Ø16 mm carbon-steel rod through a G1/4 port, it delivers 628 N of push force at 0.5 MPa, making it highly effective for moderate-load positioning tasks.
Unlike the fixed rubber bumper found on the base MBLJ, the screw-tunable cushion on this unit decelerates heavy loads near the end caps to prevent impact damage. The riveted rolling-packed barrel and grease-retaining piston seal maintain consistent lubrication over long cycles. Note that this specific SKU lacks a built-in magnet, meaning it cannot support CMSG, DMSG, or EMSG position sensors. The rear adjuster acts purely as a travel stop and does not lock the load in place.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 250–300 mm (trim 50 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 MBLCJ40X300-50
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Nominal stroke length in mm. |
| -50 | 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 MBLCJ40X300-50 Is Used
Packaging Conveyor Diverter
Pushes 25 kg cartons onto a secondary packaging line using the 628 N push force, utilizing the 250-300 mm stroke window to fine-tune the diverter arm reach without machining new hard stops.
CNC Lathe Bar Feeder
Acts as a pneumatic pusher feeding raw bar stock into a collet chuck, where the tunable air cushion prevents the 300 mm stroke from slamming metal components into the spindle.
Woodworking Door Press
Applies clamping pressure during veneer gluing, using the adjustable stroke to accommodate varying door thicknesses while the aluminum body resists workshop debris.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50 the Right Cylinder?
Stepping down to the 32 mm bore reduces output to 402 N push at 0.5 MPa, whereas stepping up to the 50 mm bore increases thrust to 981 N. Choose this 40 mm model for loads requiring roughly 64 kgf of force. Because this is a 300 mm stroke, the small 16 mm rod is susceptible to bending under lateral stress; always guide the load externally to prevent side-load damage.
The MBLCJ differs from the MBLJ by offering tunable end-cushions instead of a fixed bumper, and from the MBLC by adding the rear stroke adjuster. Remember that neither the cushion nor the adjuster locks the rod; you need live air or an external locking device for position holding. Mounting is restricted to Basic, FA, or LB styles (no SDB or back-cover options). For a drop-in replacement, match the 40 mm bore, 300 mm stroke, 50 mm adjust code, G1/4 port, PT thread, and confirm no magnet (-S) is required.
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 MBLCJ40X300-50 FAQ
At 0.5 MPa, it provides 628 N push and 528 N pull force. At 0.7 MPa, push increases to 880 N, with a maximum theoretical output of 128 kgf at 1.0 MPa. It uses a G1/4 port and a Ø16 mm rod with an M12x1.25 thread.
No, this specific SKU lacks the -S magnet option, so it cannot accept CMSG, DMSG, or EMSG position switches. Additionally, the rear adjuster is a travel stop that sets the end position, not a lock; the rod will drift without live air pressure.
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