This model is discontinued
AirTAC has phased out the MALJ series. You can still order this code here: we ship the direct replacement MBLJ20X400-30-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 MALJ20X400-30-S
The AirTAC MALJ20 Adjustable Mini Cylinder MALJ20X400-30-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 370 to 400 mm. This model is discontinued — the direct replacement is the MBLJ20X400-30-S.
- BoreØ20 mm
- Stroke400 mm
- Adjust window370–400 mm
- Port sizeG1/8
- Rod threadM8×1.25
- StatusDiscontinued → MBLJ20X400-30-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 MALJ20X400-30-S
The AirTAC MALJ20X400-30-S is a discontinued double-acting, double-rod mini cylinder with a rear adjustable stroke stopper. It features a 20mm bore, a non-standard 400mm stroke, and a 30mm adjuster, giving a usable end-position window of 370-400mm. The direct replacement is the MBLJ20X400-30-S, which matches the bore, stroke, adjust code, G1/8 port, and mounting.
This -S SKU includes a magnet for CS1-M or DS1-M reed switches; the MBLJ upgrade moves to CMSG/DMSG/EMSG sensors. The adjuster is a travel stop, not a lock, so it cannot hold a load without live air. It uses a fixed rubber bumper, not an adjustable air cushion. The 400mm stroke exceeds the 300mm standard for bore 20, making it a made-to-order part. A 400mm rod on an 8mm shaft is highly susceptible to bending under side loads, so rigid guidance is essential. The original MALJ uses threaded covers, while the MBLJ uses a riveted rolling-packed body.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-30-S Technical Specifications
| Model | Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-30-S |
|---|---|
| Series | MALJ adjustable-stroke mini cylinder (discontinued) |
| Replacement | MBLJ20X400-30-S |
| Bore size | Ø20 mm |
| Stroke | 400 mm |
| Adjustable window | 370 – 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 MBLJ20X400-30-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 MBLJ20X400-30-S matches these values.
Model Code: Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-30-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. |
| -30 | Adjustable amount: trim the end to a 370–400 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 MALJ20X400-30-S Is Used
Long-Reach Textile Feeder
Set the exact 380mm end position on a textile yarn feeding arm to align the thread guide, ensuring the 8mm rod stays supported to avoid bending on the 400mm extension.
Thin-Wall Aluminum Forming
Adjust the rear stop to 375mm for a custom aluminum cup forming stroke, using the fixed rubber bumper to soften the end impact while leaving the 30mm window for material variance.
Replacing the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-30-S with MBLJ20X400-30-S
To replace the discontinued MALJ20X400-30-S, order the exact direct replacement MBLJ20X400-30-S. Confirm the 20mm bore, 400mm stroke, 30mm adjust code, PT G1/8 port, and FA/LB mounting (no back cover or SDB). Switch your sensors from CS1-M/DS1-M to CMSG/DMSG/EMSG. The adjuster sets the 370-400mm end position but is a stop, not a lock; use an external lock for held loads.
Because the 400mm stroke exceeds the 300mm standard, it is a non-standard, made-to-order configuration. An 8mm rod over 400mm is prone to bending under side loads, so use a linear guide to prevent rod damage.
Upgrade checklist
- ✓ Order the MBLJ20X400-30-S (same bore/stroke/adjust)
- ✓ Same 370–400 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 MBLJ20X400-30-S instead of this discontinued model.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-30-S FAQ
Yes, the MALJ20X400-30-S is discontinued. The direct replacement is the MBLJ20X400-30-S, matching the 20mm bore, 400mm stroke, 30mm adjuster, G1/8 port, and FA/LB mounting. You must upgrade your sensors from CS1-M/DS1-M to CMSG/DMSG/EMSG, and the body changes from threaded covers to a riveted rolling-packed design.
The 30mm adjuster creates a usable stroke window from 370mm to 400mm. The adjuster is a travel stop, not a lock; it cannot hold a load without live air, and the cylinder uses a fixed rubber bumper, not an adjustable cushion.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
Direct Upgrade
The MBLJ20X400-30-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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