Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75S 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 75mm for a usable window of 225–300mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke300 mm
- Adjustable225–300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75S
The AirTAC MBLCJ40X300-75S 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 force at 0.5 MPa. The 75 mm rear adjuster creates a usable travel window of 225 to 300 mm, letting you dial in the exact end position. A built-in magnet enables CMSG, DMSG, or EMSG sensor switches to track rod position.
Unlike the fixed rubber bumper on an MBLJ, the screw-tunable air cushion on this unit decelerates heavy 128 kgf loads to protect the end covers. The riveted rolling-packed barrel and 20 µm hard-chrome plated carbon-steel rod provide durability. Note that the rear adjuster is a travel stop, not a lock; the cylinder cannot hold position without live air pressure.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 225–300 mm (trim 75 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 MBLCJ40X300-75S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Nominal stroke length in mm. |
| -75 | 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 MBLCJ40X300-75S Is Used
CNC Pallet Changer
Decelerates a 628 N loaded pallet at the end of a 300 mm traverse using the tunable air cushion, preventing impact damage to the machine tool enclosure.
Cardboard Strapper Feed
Uses the 225-300 mm adjustable window to precisely set the stroke for positioning corrugated boxes, while the DMSG sensor confirms the extended push position.
Screen Printing Squeegee
Tunes the end-of-stroke cushioning to smoothly decelerate the 16 mm rod and squeegee head, avoiding ink splatter from hard bumper stops.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75S the Right Cylinder?
Step down to the 32 mm bore if your load requires less force (402 N push at 0.5 MPa), or step up to the 50 mm bore for heavier moves (981 N push at 0.5 MPa). Choose the MBLCJ over the MBLJ when you need screw-tunable end-of-stroke deceleration instead of a fixed bumper, or over the MBLC when you need to trim the rear travel. The 300 mm stroke hits the maximum standard limit for this 40 mm bore; at this length, the 16 mm rod is highly susceptible to side-load bending, so an external guide rail is strongly recommended.
Replacement matching requires: 40 mm bore, 300 mm stroke, 75 mm adjustable stroke code, G1/4 port, PT thread, and the -S magnet. Mounting is limited to Basic, FA flange, or LB foot; no SDB pivot or back-cover options exist for this series. Neither the cushion nor the adjuster acts as a load-holding brake.
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 MBLCJ40X300-75S 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 is 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa.
The 75 mm rear adjuster mechanically trims the travel window to 225-300 mm, acting as a hard stop. The adjustable air cushion uses a screw to tune end-of-stroke deceleration speed. Neither holds the load; the rod drifts without live air.
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Standard models usually ship in 3-4 days.
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