Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X350-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X350-20S is a genuine double-acting aluminum-barrel mini cylinder with a Ø40mm bore, a 350mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 330–350mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke350 mm
- Adjustable330–350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X350-20S
The AirTAC MBLCJ40X350-20S 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 push and 528 N pull force at 0.5 MPa. The rear stopper allows you to trim up to 20 mm of travel, creating a precise 330-350 mm usable stroke window for exact end positioning.
Unlike the fixed rubber bumper on an MBLJ, this model uses screw-tunable end-of-stroke deceleration to absorb kinetic energy, protecting the end covers during heavy 350 mm moves. The riveted rolling-packed barrel and 20 µm hard-chrome plated carbon-steel rod handle speeds of 30-800 mm/s. Because this is a 350 mm stroke on a Ø16 mm rod, external guidance is required to prevent side-load bending. The built-in magnet (-S) supports CMSG reed and DMSG/EMSG electronic sensors.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X350-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X350-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 350 mm |
| Adjustable window | 330–350 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 MBLCJ40X350-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 MBLCJ40X350-20S Is Used
Packaging Conveyor Diverter
Uses the 330-350 mm stroke window to divert heavy corrugated cardboard cartons on a packaging line, relying on the 628 N push force at 0.5 MPa to shift loads without bouncing.
Textile Loom Beam Shift
Leverages the dual adjustable air cushions to smoothly decelerate the 350 mm travel when shifting heavy textile beams, preventing sudden impacts that would snap delicate yarn threads.
CNC Stamping Feeder
Feeds metal blanks into a stamping press using the precise 350 mm stroke, while the -S magnet triggers a DMSG electronic sensor to confirm the rod reached the adjusted 330 mm trim point.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X350-20S the Right Cylinder?
Step down to the 32 mm bore for lighter loads (402 N push @0.5 MPa) or step up to the 50 mm bore for heavier tasks (981 N push @0.5 MPa). Choose MBLCJ over MBLJ when your moving mass requires tunable pneumatic deceleration rather than a fixed bumper, or over MBLC when you need the 330-350 mm rear travel adjustment. The rear adjuster sets the physical end position and the cushion only decelerates; neither holds the load, so use an external lock for position holding.
Mounting is limited to Basic, FA flange, or LB foot (no SDB pivot or back-cover code). The overall length equals A + 2 x stroke + adjust. For exact replacement matching, verify: 40 mm bore, 350 mm stroke, 20 mm adjust code, G1/4 port, PT thread, and the -S magnet. Fluid must be air filtered to 40 µm.
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 MBLCJ40X350-20S 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 rear adjustable stroke is a mechanical stopper that trims the usable travel window to 330-350 mm. The adjustable air cushion is a screw-tunable valve that controls end-of-stroke deceleration. Neither acts as a lock to hold a load in place.
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Standard models usually ship in 3-4 days.
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