This model is discontinued
AirTAC has phased out the MALJ series. You can still order this code here: we ship the direct replacement MBLJ20X450-30-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 MALJ20X450-30-S
The AirTAC MALJ20 Adjustable Mini Cylinder MALJ20X450-30-S is a double-acting aluminum mini cylinder with a rear adjustable-stroke stopper: you can trim up to 30 mm, giving a usable end-position window from 420 to 450 mm. This model is discontinued — the direct replacement is the MBLJ20X450-30-S.
- BoreØ20 mm
- Stroke450 mm
- Adjust window420–450 mm
- Port sizeG1/8
- Rod threadM8×1.25
- StatusDiscontinued → MBLJ20X450-30-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 MALJ20X450-30-S
The AirTAC MALJ20X450-30-S is a discontinued double-acting mini cylinder with a 20mm bore and a 450mm stroke. It is non-standard (exceeding the 300mm max standard stroke), meaning it was made-to-order. The -30 adjust code lets you trim up to 30mm at the rear, creating a usable stroke window of 420-450mm. The direct replacement is the MBLJ20X450-30-S, matching bore, stroke, adjuster, and G1/8 port.
This -S SKU includes a magnet for CS1-M or DS1-M switches; the MBLJ replacement upgrades this to CMSG/DMSG/EMSG sensors. The original MALJ uses threaded covers, while the MBLJ uses a riveted rolling-packed body. Remember the adjuster is a travel stop, not a lock; it sets the end position but will not hold a load without live air. End impact is softened by a fixed rubber bumper, as there is no adjustable air cushion.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X450-30-S Technical Specifications
| Model | Airtac MALJ20 Adjustable Mini Cylinder MALJ20X450-30-S |
|---|---|
| Series | MALJ adjustable-stroke mini cylinder (discontinued) |
| Replacement | MBLJ20X450-30-S |
| Bore size | Ø20 mm |
| Stroke | 450 mm |
| Adjustable window | 420 – 450 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 MBLJ20X450-30-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 MBLJ20X450-30-S matches these values.
Model Code: Airtac MALJ20 Adjustable Mini Cylinder MALJ20X450-30-S
| MALJ | Adjustable-stroke aluminum mini cylinder, double acting (discontinued). |
|---|---|
| 20 | Bore size in mm (20/25/32/40). |
| ×450 | Nominal stroke length in mm. |
| -30 | Adjustable amount: trim the end to a 420–450 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 MALJ20X450-30-S Is Used
Textile Web Edge Guide
Fine-tune the end position of a web edge guide on a textile slitter; the 30mm rear stop window lets operators adjust reach on the fly for different fabric widths.
Thin-Film Dispenser
Actuate a thin-film adhesive dispenser over a 450mm span, trimming the stroke 30mm to prevent over-travel and ensuring precise bead placement without external shock absorbers.
Replacing the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X450-30-S with MBLJ20X450-30-S
To replace this MALJ20X450-30-S, order the exact direct replacement MBLJ20X450-30-S. Confirm the 20mm bore, 450mm stroke, -30 adjust code, G1/8 port, PT thread, and basic mounting (no back cover or SDB). The -S magnet changes sensor families from CS1-M/DS1-M to CMSG/DMSG/EMSG. The rear adjuster is a travel stop, not a lock, so add an external lock for held loads.
Because this 450mm stroke is non-standard and very long for a 20mm rod, it is highly susceptible to rod-bending and side-load damage; strict guide alignment is critical to prevent premature seal failure.
Upgrade checklist
- ✓ Order the MBLJ20X450-30-S (same bore/stroke/adjust)
- ✓ Same 420–450 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 MBLJ20X450-30-S instead of this discontinued model.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X450-30-S FAQ
Yes, the MALJ20X450-30-S is discontinued. The direct replacement is the MBLJ20X450-30-S, matching the 20mm bore, 450mm stroke, 30mm adjust code, and G1/8 port. The MBLJ upgrades the body to a riveted rolling-packed design and the -S magnet switches from CS1-M/DS1-M to CMSG/DMSG/EMSG sensors.
The -30 adjust code lets you trim the end position up to 30mm, creating a usable stroke window of 420-450mm. The adjuster is a travel stop, not a lock.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
Direct Upgrade
The MBLJ20X450-30-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
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