Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-40S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-40S is a genuine double-acting aluminum-barrel mini cylinder with a Ø20mm 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).
- BoreØ20 mm
- Stroke300 mm
- Adjustable260–300 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-40S
The AirTAC MBLCJ20X300-40S is a compact double-acting mini cylinder with a single rod and a 300 mm stroke. It features a rear stroke adjuster allowing you to trim up to 40 mm of travel, creating a usable end-position window of 260 to 300 mm. An integrated adjustable air cushion at both ends allows screw-tunable deceleration, absorbing kinetic energy at high speeds to protect the end covers. This 20 mm bore generates 157 N of push force and 132 N of pull force at 0.5 MPa.
Because the stroke exceeds the 300 mm standard maximum for this 20 mm bore, it is a non-standard length requiring careful load management. The 8 mm carbon-steel rod features 20 μm hard-chrome plating to resist wear, but at this extended length, side loads must be minimized to prevent rod bending. The built-in magnet (-S) enables position detection with CMSG reed switches or DMSG/EMSG electronic sensors. The riveted aluminum barrel keeps the frame light for tight machinery spaces.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-40S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-40S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 260–300 mm (trim 40 mm) |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M8×1.25 |
| 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 300 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 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 MBLCJ20X300-40S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | 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 MBLCJ20X300-40S Is Used
PCB Edge Conveyor Routing
Deploys a routing blade on a 300 mm travel axis to cut printed circuit board panels. The 260-300 mm adjustable window fine-tunes the cut depth, while the air cushion prevents end-cover impact during fast 157 N extension.
Textile Loom Tensioning
Positions a yarn guide bar across a wide fabric loom. The tunable air cushion decelerates the 8 mm rod smoothly at stroke ends to prevent thread snags, and the CMSG reed sensor confirms the guide is fully retracted.
Thin-Film Web Splicing
Actuates a splicing clamp on a packaging film unwind stand. The 132 N pull force secures the film, and the 40 mm rear stroke adjustment lets operators dial in the exact clamp position without moving the cylinder body.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-40S the Right Cylinder?
Select this 20 mm bore when you need 157 N push force at 0.5 MPa within a tight footprint. If your application requires less force, a smaller option is not available in this series, but if you need more power, stepping up to the 25 mm bore yields 245 N of push force. This MBLCJ model differs from the MBLJ because it uses a tunable air cushion rather than a fixed rubber bumper, and it differs from the MBLC by offering the 40 mm rear stroke adjuster. Remember, the rear adjuster is a travel stop, and the cushion only decelerates; neither will hold a load in place without live air pressure.
For replacements, match the 20 mm bore, 300 mm stroke, 40 mm adjust code, G1/8 port, and default PT thread. Mounting is limited to Basic, FA (flange), or LB (foot); there is no SDB pivot or back-cover option. At 300 mm stroke, the overall length grows significantly (A + 600 + 40), so you must use an external guide to support the rod and prevent binding. The -S code means a magnet is fitted for CMSG, DMSG, or EMSG sensors.
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 MBLCJ20X300-40S FAQ
At 0.5 MPa, this 20 mm bore double-acting cylinder provides 157 N of push force and 132 N of pull force. At 0.7 MPa, the push force increases to 220 N. The maximum theoretical force is 32 kgf at 1.0 MPa.
The 40 mm adjustable stroke is a mechanical rear stopper that trims the usable travel window to 260-300 mm; it sets the end position but does not lock the load. The adjustable air cushion is a separate screw-tunable valve that controls end-of-stroke deceleration to absorb kinetic energy. Neither mechanism holds position without live air pressure.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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Related AirTAC Adjustable-Stroke Cylinders
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