This model is discontinued
AirTAC has phased out the MALJ series. You can still order this code here: we ship the direct replacement MBLJ20X400-50-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 MALJ20X400-50-S
The AirTAC Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50-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 350 to 400 mm. This model is discontinued — the direct replacement is the MBLJ20X400-50-S.
- BoreØ20 mm
- Stroke400 mm
- Adjust window350–400 mm
- Port sizeG1/8
- Rod threadM8×1.25
- StatusDiscontinued → MBLJ20X400-50-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 MALJ20X400-50-S
The AirTAC MALJ20X400-50-S is a discontinued double-acting, double-rod mini cylinder with a 50 mm rear travel stopper, yielding a usable stroke window of 350-400 mm. The direct replacement is the MBLJ20X400-50-S, matching the bore, adjuster, and G1/8 port.
This 400 mm unit is a non-standard made-to-order stroke exceeding the 300 mm max. It uses a fixed rubber bumper and a heterogeneous grease-retaining seal. The -S magnet uses CS1-M / DS1-M switches, while the MBLJ upgrades to CMSG / DMSG / EMSG sensors and a riveted rolling-packed body. The adjuster sets end position but does not hold load without live air.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50-S Technical Specifications
| Model | Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50-S |
|---|---|
| Series | MALJ adjustable-stroke mini cylinder (discontinued) |
| Replacement | MBLJ20X400-50-S |
| Bore size | Ø20 mm |
| Stroke | 400 mm |
| Adjustable window | 350 – 400 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 MBLJ20X400-50-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 MBLJ20X400-50-S matches these values.
Model Code: Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50-S
| MALJ | Adjustable-stroke aluminum mini cylinder, double acting (discontinued). |
|---|---|
| 20 | Bore size in mm (20/25/32/40). |
| ×400 | Nominal stroke length in mm. |
| -50 | Adjustable amount: trim the end to a 350–400 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 MALJ20X400-50-S Is Used
PCB Edge Router Depth Stop
Dial the 350-400 mm reach to lower a routing spindle precisely onto a PCB panel without adding external physical stops to the machine frame.
Long-Reach Textile Tensioner
Trims the 8 mm carbon-steel rod extension by up to 50 mm to fine-tune fabric web tensioning arms, absorbing slight web thickness changes on the fly.
Replacing the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50-S with MBLJ20X400-50-S
To replace this MALJ20X400-50-S, order the MBLJ20X400-50-S. Confirm the 20 mm bore, 400 mm stroke, 50 mm adjust code, PT G1/8 port, M8x1.25 rod, and FA/LB mounting (no back cover or SDB). The adjuster is a travel stop, not a lock.
At 400 mm, this non-standard stroke is highly susceptible to rod bending under side-load. Use a guide rail to prevent binding. The MBLJ keeps the same fixed rubber bumper, so it softens impact but provides no air cushioning.
Upgrade checklist
- ✓ Order the MBLJ20X400-50-S (same bore/stroke/adjust)
- ✓ Same 350–400 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 MBLJ20X400-50-S instead of this discontinued model.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50-S FAQ
Yes, the MALJ20X400-50-S is discontinued. The direct replacement is the MBLJ20X400-50-S, matching the 20 mm bore, 400 mm stroke, 50 mm adjuster, and G1/8 port. The MBLJ upgrades the body to a riveted rolling-packed design and changes the -S magnet switches from CS1-M / DS1-M to CMSG / DMSG / EMSG.
The -50 adjust code allows trimming up to 50 mm at the rear, creating a usable 350-400 mm stroke window. 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 MBLJ20X400-50-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 MALJ20X400-50-S → MBLJ20X400-50-S)
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