This model is discontinued
AirTAC has phased out the MALJ series. You can still order this code here: we ship the direct replacement MBLJ20X300-50, 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 MALJ20X300-50
The AirTAC Airtac MALJ20 Adjustable Mini Cylinder MALJ20X300-50 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 250 to 300 mm. This model is discontinued — the direct replacement is the MBLJ20X300-50.
- BoreØ20 mm
- Stroke300 mm
- Adjust window250–300 mm
- Port sizeG1/8
- Rod threadM8×1.25
- StatusDiscontinued → MBLJ20X300-50
- 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 MALJ20X300-50
The AirTAC MALJ20X300-50 is a discontinued double-acting, double-rod mini cylinder. The direct replacement is the MBLJ20X300-50, matching the 20mm bore, 300mm stroke, 50mm adjuster, G1/8 port and 32 kgf max force. The -50 rear screw creates a usable stroke window of 250-300mm, letting you dial in the exact reach without external stops.
It uses a fixed rubber bumper, not an adjustable air cushion. Because this SKU lacks the -S magnet, it cannot accept a position sensor. Note the 300mm stroke is the absolute maximum for this bore, so rod side-load and bending moments must be carefully controlled. The adjuster is a travel stop, not a lock, and will not hold a load without live air.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X300-50 Technical Specifications
| Model | Airtac MALJ20 Adjustable Mini Cylinder MALJ20X300-50 |
|---|---|
| Series | MALJ adjustable-stroke mini cylinder (discontinued) |
| Replacement | MBLJ20X300-50 |
| Bore size | Ø20 mm |
| Stroke | 300 mm |
| Adjustable window | 250 – 300 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 MBLJ20X300-50 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 MBLJ20X300-50 matches these values.
Model Code: Airtac MALJ20 Adjustable Mini Cylinder MALJ20X300-50
| MALJ | Adjustable-stroke aluminum mini cylinder, double acting (discontinued). |
|---|---|
| 20 | Bore size in mm (20/25/32/40). |
| ×300 | Nominal stroke length in mm. |
| -50 | Adjustable amount: trim the end to a 250–300 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 MALJ20X300-50 Is Used
Carton Flap Tucking
Fine-tune the extended reach on a packaging line carton sealer, trimming up to 50mm at the rear to accommodate varying box heights while avoiding side-load on the long 300mm stroke.
Label Applicator Stroke
Adjust the end position for a print-and-apply label head, using the rear stopper to shift the 300mm stroke backward by 50mm without repositioning the entire cylinder bracket.
Replacing the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X300-50 with MBLJ20X300-50
To replace this MALJ20X300-50 with the MBLJ20X300-50, confirm the 20mm bore, 300mm stroke, 50mm adjust code, G1/8 PT port, and M8x1.25 rod thread. Mounting is Basic, FA, or LB only as there is no back cover or SDB option. The MBLJ upgrade changes the threaded covers to a riveted rolling-packed body. Since this SKU has no -S magnet, you lose no sensors in the swap, but older MALJ-S magnets used CS1-M/DS1-M while MBLJ uses CMSG/DMSG/EMSG.
Because this 300mm stroke is the absolute maximum limit for a 20mm rod, rod side-load and bending moments are a critical risk. Ensure rigid front mounting and precise alignment to prevent rod binding.
Upgrade checklist
- ✓ Order the MBLJ20X300-50 (same bore/stroke/adjust)
- ✓ Same 250–300 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 MBLJ20X300-50 instead of this discontinued model.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X300-50 FAQ
Yes, the MALJ20X300-50 is discontinued. The direct replacement is the MBLJ20X300-50, which shares the same 20mm bore, 300mm stroke, 50mm adjuster, G1/8 port, and 32 kgf max force. The MBLJ upgrades the threaded covers to a riveted rolling-packed body.
The -50 code means the rear screw lets you trim the end position by up to 50mm, creating a usable stroke window of 250-300mm. This 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 MBLJ20X300-50 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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