Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-50S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-50S 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 50mm for a usable window of 250–300mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke300 mm
- Adjustable250–300 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-50S
The AirTAC MBLCJ20X300-50S is a compact double-acting mini cylinder featuring a rear stroke adjuster and tunable air cushions at both ends. It delivers 157 N push and 132 N pull force at 0.5 MPa. The rear stopper allows you to trim up to 50 mm of travel, creating a precise 250-300 mm usable stroke window for exact end positioning. An integrated magnet enables position feedback.
Screw-tunable end-of-stroke cushioning is critical for a 300 mm stroke, preventing the piston from slamming the end covers at high speeds. This cylinder uses an 8 mm hard-chrome plated carbon-steel rod and a riveted aluminum barrel. Note that the rear adjuster sets the travel endpoint but does not lock the load; external guides are highly recommended for this 300 mm extension to prevent rod bending under side loads.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-50S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-50S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 250–300 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 MBLCJ20X300-50S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | Bore size in mm. |
| ×300 | 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 MBLCJ20X300-50S Is Used
PCB Edge Conveyor Routing
Uses the 250-300 mm adjustable stroke window to precisely set the routing position of thin boards on an SMT line, while the 157 N force cleanly actuates the diverter gate without damaging panels.
Light-Parts Sorting Chute
Tunable air cushions decelerate the 300 mm stroke smoothly when deflecting small plastic components into packaging bins, preventing bounce-back that would disrupt the optical sensor array.
Label Applicator Platen
The integrated magnet triggers a DMSG electronic switch to confirm the platen position, while the rear adjuster dials in the exact 250 mm retracted length to fit varying label roll widths.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-50S the Right Cylinder?
Choose this 20 mm bore when you need exact 250-300 mm travel with end-position tuning and 157 N of thrust at 0.5 MPa. If your application requires less force, no smaller MBLCJ bore exists. If you need more power, step up to the 25 mm bore, which provides 245 N push and 206 N pull at 0.5 MPa. Compared to the MBLJ series, this MBLCJ model uses adjustable air cushions instead of a fixed rubber bumper to decelerate heavier loads smoothly.
The rear stroke adjuster is a mechanical travel stop, not a locking mechanism; the cylinder cannot hold position without continuous air pressure. Mounting is limited to Basic, FA, or LB styles, with no back-cover or SDB pivot options available. For exact replacements, match the 20 mm bore, 300 mm stroke, 50 mm adjust code, G1/8 port, PT thread, and the -S magnet. The 8 mm rod requires external support over 300 mm to avoid deflection.
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 MBLCJ20X300-50S FAQ
At 0.5 MPa, this 20 mm bore cylinder provides 157 N push and 132 N pull force. At 0.7 MPa, the push force increases to 220 N. The maximum theoretical force is 32 kgf at 1.0 MPa. It operates between 0.15 and 1.0 MPa, with a speed range of 30-800 mm/s.
The adjustable stroke uses a rear mechanical stopper to physically limit the travel window from 250 to 300 mm, setting the exact end position. The adjustable air cushion uses a needle screw to tune the rate of pneumatic deceleration near the stroke ends, absorbing kinetic energy. Neither feature locks the load in place.
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Standard models usually ship in 3-4 days.
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