This model is discontinued
AirTAC has phased out the MALJ series. You can still order this code here: we ship the direct replacement MBLJ20X500-50, 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 MALJ20X500-50
The AirTAC Airtac MALJ20 Adjustable Mini Cylinder MALJ20X500-50 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 450 to 500 mm. This model is discontinued — the direct replacement is the MBLJ20X500-50.
- BoreØ20 mm
- Stroke500 mm
- Adjust window450–500 mm
- Port sizeG1/8
- Rod threadM8×1.25
- StatusDiscontinued → MBLJ20X500-50
- 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 MALJ20X500-50
The AirTAC MALJ20X500-50 is a discontinued double-acting mini cylinder with a 20mm bore and 500mm stroke. It features a rear screw stopper that trims up to 50mm, giving a usable end-position window of 450-500mm. Because 500mm exceeds the 300mm standard maximum for this bore, it is a non-standard, made-to-order length. The direct replacement is the MBLJ20X500-50, matching the force, G1/8 port, and mounting.
This unit has no magnet, so it cannot accept a position sensor. The adjuster is a travel stop, not a lock; it sets the end position but will not hold a load without live air. The fixed rubber bumper softens end impact, but this is not an adjustable cushion. Upgrading to the MBLJ20X500-50 moves you from threaded covers to a riveted rolling-packed body. On a 500mm stroke, side-load and rod-bending forces are magnified, so precise guiding is critical.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X500-50 Technical Specifications
| Model | Airtac MALJ20 Adjustable Mini Cylinder MALJ20X500-50 |
|---|---|
| Series | MALJ adjustable-stroke mini cylinder (discontinued) |
| Replacement | MBLJ20X500-50 |
| Bore size | Ø20 mm |
| Stroke | 500 mm |
| Adjustable window | 450 – 500 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 MBLJ20X500-50 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 MBLJ20X500-50 matches these values.
Model Code: Airtac MALJ20 Adjustable Mini Cylinder MALJ20X500-50
| MALJ | Adjustable-stroke aluminum mini cylinder, double acting (discontinued). |
|---|---|
| 20 | Bore size in mm (20/25/32/40). |
| ×500 | Nominal stroke length in mm. |
| -50 | Adjustable amount: trim the end to a 450–500 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 MALJ20X500-50 Is Used
Adjustable Package Pusher
Trims the rear stop by up to 50mm to index varying box lengths on a packaging line, preventing crushing while utilizing the full 500mm stroke for deep carton placement.
Film Roll Tensioning Arm
Sets a precise end position for a long tensioning lever in a film converting machine, where the 8mm rod and 500mm reach require careful alignment to avoid side-load.
Replacing the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X500-50 with MBLJ20X500-50
To replace the MALJ20X500-50, order the MBLJ20X500-50. Confirm the 20mm bore, 500mm stroke, 50mm adjust code, PT G1/8 port, and M8x1.25 rod thread. Mounting is FA or LB only; there is no back cover or SDB option. Because this SKU lacks the -S magnet, it cannot take a sensor, and the MBLJ upgrade without -S also takes none. If you need a sensor, you must move to an -S model and change from the old CS1-M/DS1-M switches to the CMSG/DMSG/EMSG family. Remember the adjuster is a stop, not a lock.
At 500mm stroke, the 8mm rod is highly susceptible to bending; use external guides to prevent side-load damage. If your force needs are lower, the 20mm bore is the smallest available.
Upgrade checklist
- ✓ Order the MBLJ20X500-50 (same bore/stroke/adjust)
- ✓ Same 450–500 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 MBLJ20X500-50 instead of this discontinued model.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X500-50 FAQ
Yes, the MALJ20X500-50 is discontinued. The direct replacement is the MBLJ20X500-50, which matches the 20mm bore, 500mm stroke, 50mm adjust code, G1/8 port, and mounting. The MBLJ upgrades the body to a riveted rolling-packed design from the original threaded covers.
The 50mm adjuster creates a usable stroke window of 450-500mm. The adjuster is a travel stop, not a lock, and cannot hold a load without live air.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
Direct Upgrade
The MBLJ20X500-50 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
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