Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X80-50
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X80-50 is a genuine double-acting aluminum-barrel mini cylinder with a Ø20mm bore, a 80mm nominal stroke and a rear adjustable-stroke stopper — trim up to 50mm for a usable window of 30–80mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke80 mm
- Adjustable30–80 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X80-50
The AirTAC MBLCJ20X80-50 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. You can trim up to 50 mm of travel at the rear, creating a usable stroke window of 30 to 80 mm. Driven through a G1/8 port, the Ø8 mm hard-chrome rod delivers 157 N of push and 132 N of pull at 0.5 MPa, making it well-suited for fast, light-load positioning tasks.
Unlike the base MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable air cushioning to decelerate the piston near each end cover, absorbing kinetic energy from higher speeds. Note that this specific SKU lacks a built-in magnet, meaning it cannot support CMSG, DMSG, or EMSG position sensors. The riveted rolling-packed barrel and grease-retaining piston seal ensure stable friction for a long service life.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X80-50 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X80-50 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 80 mm |
| Adjustable window | 30–80 mm (trim 50 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 MBLCJ20X80-50
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | Bore size in mm. |
| ×80 | 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 MBLCJ20X80-50 Is Used
PCB Edge Routing
Deploys the 30-80 mm stroke window to precisely lower a routing spindle onto a printed circuit board, using the adjustable cushion to prevent impact bounce on the 157 N downward push.
Lab Vial Indexing
Drives a Geneva gear mechanism for a rotary vial carousel, where the rear stopper sets the exact 45 mm push stroke and the air cushion softens the rack stop for fragile glass tubes.
Fiber Tensioning
Applies a steady 132 N pull on a textile or carbon fiber bobbin cradle, using the tunable end-cushion to decelerate the rapid 80 mm retraction without snapping the delicate filament.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X80-50 the Right Cylinder?
If 157 N of push at 0.5 MPa is too much for your fixture, stepping down to the 20 mm bore's smaller sibling—the 12 mm bore—lowers the output to 45 N, whereas stepping up to the 25 mm bore increases thrust to 245 N. Choose the MBLCJ over the MBLJ when your moving mass demands tunable end-deceleration rather than a fixed rubber bumper, or over the MBLC when you need a variable travel stop rather than a fixed overall length.
Remember that the rear adjuster is a travel stop, not a mechanical lock; it cannot hold a load in place without continuous air pressure, and the cushion only decelerates without braking. Mounting is limited to Basic, FA flange, or LB foot styles, as this series omits the SDB pivot and back-cover options. When ordering a replacement, confirm the 20 mm bore, 80 mm stroke, 50 mm adjust code, PT thread form, and the absence of the -S magnet sensor.
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 MBLCJ20X80-50 FAQ
At 0.5 MPa, this 20 mm bore cylinder provides 157 N of push and 132 N of pull. At 0.7 MPa, the push increases to 220 N. The absolute maximum theoretical force is 32 kgf at 1.0 MPa.
No, this specific SKU lacks the -S code, meaning it has no built-in magnet and cannot trigger CMSG, DMSG, or EMSG sensors. Additionally, the rear 50 mm adjuster only acts as a travel stop to set the 30-80 mm window; it does not lock the load, and the air cushion only decelerates the piston without holding position.
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