Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-50S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-50S is a genuine double-acting aluminum-barrel mini cylinder with a Ø20mm bore, a 250mm nominal stroke and a rear adjustable-stroke stopper — trim up to 50mm for a usable window of 200–250mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke250 mm
- Adjustable200–250 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-50S
The AirTAC MBLCJ20X250-50S is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and a tunable air cushion at both ends. The 50 mm rear adjustment creates a usable travel window of 200 to 250 mm. Driven by an Ø8 mm carbon-steel rod with 20 um hard-chrome plating, it delivers 157 N of push force and 132 N of pull force at 0.5 MPa. This stroke length suits extended reach pick-and-place movements on small automated assembly lines.
Unlike the base MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable end-of-stroke deceleration to absorb kinetic energy, protecting the end covers during faster cycling. The riveted rolling-packed aluminum barrel maintains a small footprint, while the heterogeneous two-way grease-retaining piston seal keeps friction low. The built-in magnet (-S) enables position detection with CMSG reed or DMSG/EMSG electronic switches. Remember the rear stopper sets the travel end; it does not lock the load, and the cylinder drifts without live air pressure.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-50S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-50S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 250 mm |
| Adjustable window | 200–250 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 MBLCJ20X250-50S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | Bore size in mm. |
| ×250 | 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 MBLCJ20X250-50S Is Used
PCB Edge Conveyor Stops
Uses the 200-250 mm stroke window to actuate stopper pins on a PCB edge conveyor, tuning the air cushion to softly catch rapidly arriving boards without bouncing.
Small Parts Ejector
Ejects lightweight plastic caps from a molding press; the 157 N push force clears the tool, while the adjustable cushion halts the 250 mm travel smoothly to protect the end cover.
Label Applicator Arm
Drives a label wipe-down arm on a packaging line; the DMSG electronic sensor tracks the rod position while the cushioning decelerates the 8 mm rod at high speed.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-50S the Right Cylinder?
When sizing this 20 mm bore, step down to the smaller 16 mm variant if your application requires less than 100 N of push force, or step up to the 25 mm bore (delivering 245 N push at 0.5 MPa) if you need to move heavier jigs. Choose the MBLCJ over the MBLJ when your cycle speed demands adjustable pneumatic cushioning rather than a fixed bumper, or choose the MBLC if you need fixed stroke lengths without the rear adjuster. The rear adjuster and the air cushion only decelerate the rod; neither holds position mechanically, so use an external locking device for static load holding. Mounting is limited to Basic, FA flange, or LB foot styles (no SDB pivot or back-cover options are available). To match this exact replacement, specify: 20 mm bore, 250 mm stroke, 50 mm adjust code, G1/8 port, PT thread, and the -S magnet. Because the stroke is 250 mm on an 8 mm rod, use an external guide to prevent rod bending under side loads.
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 MBLCJ20X250-50S FAQ
At 0.5 MPa, the 20 mm bore provides 157 N push and 132 N pull. At 0.7 MPa, push is 220 N. The maximum theoretical force is 32 kgf at 1.0 MPa.
The rear stroke adjuster is a mechanical travel stop that trims the usable stroke from 200 to 250 mm. The adjustable air cushion is a screw-tunable valve that decelerates the piston near the end of travel. Neither holds the load; the rod drifts without air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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