This model is discontinued
AirTAC has phased out the MALJ series. You can still order this code here: we ship the direct replacement MBLJ20X55-50-S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The MBLJ replacement upgrades to a riveted rolling-packed body and CMSG / DMSG / EMSG sensors (the MAL used CS1-M / DS1-M).
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S
The AirTAC Airtac MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S is a double-acting aluminum mini cylinder with a rear adjustable-stroke stopper: you can trim up to 50 mm, giving a usable end-position window from 5 to 55 mm. This model is discontinued — the direct replacement is the MBLJ20X55-50-S.
- BoreØ20 mm
- Stroke55 mm
- Adjust window5–55 mm
- Port sizeG1/8
- Rod threadM8×1.25
- StatusDiscontinued → MBLJ20X55-50-S
- 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 MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S
The AirTAC MALJ20X55-50-S is a discontinued double-acting mini cylinder with a 50 mm rear adjustable stroke stopper. It provides a usable travel window of 5 to 55 mm. The direct replacement is the MBLJ20X55-50-S.
This -S SKU includes a magnet for position sensing. The legacy MALJ works with CS1-M or DS1-M reed switches, while the MBLJ upgrade uses CMSG, DMSG or EMSG solid-state sensors. The old MALJ body uses threaded covers, whereas the MBLJ features a riveted rolling-packed body. Both share a fixed rubber bumper for end-of-stroke impact absorption, not an adjustable air cushion.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S Technical Specifications
| Model | Airtac MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S |
|---|---|
| Series | MALJ adjustable-stroke mini cylinder (discontinued) |
| Replacement | MBLJ20X55-50-S |
| Bore size | Ø20 mm |
| Stroke | 55 mm |
| Adjustable window | 5 – 55 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | G1/8 |
| Rod thread | M8×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.1 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Fixed rubber bumper |
| Max standard stroke | Up to 300 mm |
The rear adjuster is a travel stop, not a lock — it sets the end position but does not hold the load without live air. No back-cover code and no SDB on adjustable-stroke. The MBLJ20X55-50-S carries the same ratings.
Theoretical Output Force (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 132 N | 132 N |
| 0.7 MPa | 185 N | — |
| Max (@1.0 MPa) | 27 kgf | |
MALJ is double-rod: the rear rod that carries the stroke adjuster passes through the rear cover, so both piston faces lose rod area. Push is shown at the annular-area value (conservative), lower than a single-rod MAL push of the same bore. The MBLJ20X55-50-S matches these values.
Model Code: Airtac MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S
| MALJ | Adjustable-stroke aluminum mini cylinder, double acting (discontinued). |
|---|---|
| 20 | Bore size in mm (20/25/32/40). |
| ×55 | Nominal stroke length in mm. |
| -50 | Adjustable amount: trim the end to a 5–55 mm window. |
| S | Optional magnet for a CS1-M / DS1-M sensor (MBLJ uses CMSG/DMSG/EMSG). |
Replacement: MALJ → MBLJ. No back-cover (CA/U/CM) and no SDB. Mounting: FA / LB.
Where the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S Is Used
PCB Depaneling Router Z-Axis
Dial in the 5 to 55 mm depth window to set a precise router bit plunge depth on an automated PCB depaneling machine without needing custom spacers.
Micro-Dispense Valve Probing
Adjusts the end position to fine-tune the exact height of a fluid dispense nozzle above a wafer, ensuring consistent dot volume without reprogramming the PLC.
Replacing the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S with MBLJ20X55-50-S
To replace the MALJ20X55-50-S, order the MBLJ20X55-50-S. It matches the 20 mm bore, 55 mm stroke, 50 mm adjust code, G1/8 port, and PT thread form. Mounting remains Basic, FA or LB only, as there is no back-cover or SDB option. The -S magnet means you must switch from the old CS1-M/DS1-M switches to the new CMSG/DMSG/EMSG sensor family.
The rear adjuster sets the end position but is a travel stop, not a lock; it will not hold a load without live air pressure. Confirm overall length from the datasheet.
Upgrade checklist
- ✓ Order the MBLJ20X55-50-S (same bore/stroke/adjust)
- ✓ Same 5–55 mm adjustable window
- ✓ Adjuster is a stop, not a lock
- ✓ No back cover / SDB — plan an FA/LB mount
- ✓ Sensor: swap CS1-M/DS1-M → CMSG/DMSG/EMSG
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.1 – 1.0 MPa operating pressure.
- check The rear adjuster sets the end position — it is not a load lock.
- check No back-cover / SDB on adjustable-stroke — use FA / LB.
- check Front/rear covers are threaded — not for field disassembly.
- check For new builds, specify the MBLJ20X55-50-S instead of this discontinued model.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S FAQ
Yes, the MALJ20X55-50-S is discontinued. The direct replacement is the MBLJ20X55-50-S, which matches the 20 mm bore, 55 mm stroke, 50 mm adjust code, and G1/8 port. You will need to upgrade your sensors from the old CS1-M/DS1-M reed switches to the new CMSG/DMSG/EMSG family.
The 50 mm adjust code allows you to trim the 55 mm stroke down to a 5 mm usable window. Note that the adjuster is a travel stop, not a lock, and it cannot hold a load without live air.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
Direct Upgrade
The MBLJ20X55-50-S replaces this model 1:1.
Fast Dispatch
MBLJ replacements are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Recommended AirTAC MBLJ Replacements
Request a Quote (Airtac MALJ20 Adjustable Mini Cylinder MALJ20X55-50-S → MBLJ20X55-50-S)
Tell us the quantity and destination — we quote the direct MBLJ20X55-50-S replacement with price, stock and lead time, usually within 7-8 hours.