Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X50-40S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X50-40S is a genuine double-acting aluminum-barrel mini cylinder with a Ø20mm bore, a 50mm nominal stroke and a rear adjustable-stroke stopper — trim up to 40mm for a usable window of 10–50mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke50 mm
- Adjustable10–50 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X50-40S
The AirTAC MBLCJ20X50-40S is a compact double-acting mini cylinder featuring a rear travel adjuster and tunable air cushions at both ends. The 40mm adjustment code lets you trim the rear stroke, creating a usable positioning window from 10 to 50mm. Driven by an 8mm carbon-steel rod with hard-chrome plating, it delivers 157N of push force at 0.5 MPa, making it ideal for light-duty routing and delicate stops.
Unlike the standard MBLJ bumper variant, this model uses screw-tunable end-of-stroke deceleration to protect components during faster cycles. The riveted aluminum barrel keeps the frame compact for tight machine spaces. Fitted with a built-in magnet (-S), it supports AirTAC CMSG reed and DMSG or EMSG electronic sensors for precise rod detection.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X50-40S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X50-40S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 50 mm |
| Adjustable window | 10–50 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 MBLCJ20X50-40S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 MBLCJ20X50-40S Is Used
PCB Depaneling Saw
Uses the 10-50mm adjustable stroke window to precisely set the cutting depth of a circular saw on a router, while the air cushion protects the fragile board at stroke end.
Micro-Dispense Valve
Leverages the 157N push force to actuate a precision adhesive valve, with the rear stopper allowing exact shot volume tuning without reprogramming the PLC.
Thin-Wall Part Ejector
Employs the tunable cushioning to softly eject delicate plastic housings from an injection mold, preventing cosmetic scuffing during high-speed cycling.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X50-40S the Right Cylinder?
Choose this 20mm bore when you need exactly 157N push force at 0.5 MPa with tunable end-cushioning. If your payload is lighter, stepping down is not an option as this is the smallest available size; if you need more power, the 25mm bore provides 245N. Remember the rear travel adjuster is a hard stop, not a lock—the rod will drift without live air pressure. The overall length extends by the adjustment amount, and mounting is limited to Basic, FA, or LB styles without any back-cover options. For exact replacements, match the 20mm bore, 50mm stroke, 40mm adjust, G1/8 port, PT threads, and the -S magnet.
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 MBLCJ20X50-40S FAQ
At 0.5 MPa it provides 157N push and 132N pull force; at 0.7 MPa it pushes 220N, with a theoretical maximum of 32 kgf at 1.0 MPa. The 40mm rear adjuster allows you to mechanically trim the stroke down to a 10mm minimum, giving a usable travel window of 10 to 50mm.
The rear stroke adjuster is a mechanical screw that physically stops the piston to set your end position, while the adjustable air cushion is a needle valve that controls exhaust flow to decelerate the piston just before it hits the cover. Neither component locks the rod in place; the cylinder requires continuous air pressure to hold a load.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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