This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is SAUJ50X125-40 — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the SAUJ50X125-40 in place of this model. The SAU replacement uses the same profile body, bore, stroke, force and SC-series mounting. It moves to the current CMSG / DMSG / EMSG sensor switches (the SU used CS1-B / DS1-B) and adds the SAUF valve-integrated option.
Airtac SUJ Adjustable Cylinder SUJ50X125-40
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X125-40 is a double-acting profile-type standard cylinder with a Ø50mm bore and 125mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the SAUJ50X125-40, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X125-40
About the Airtac SUJ Adjustable Cylinder SUJ50X125-40
The AirTAC SUJ50X125-40 is a discontinued double-acting single-rod profile cylinder with an external stop screw that lets you trim the extend stroke by up to 40 mm on-site, giving a usable forward travel of 85 to 125 mm. The 50 mm bore uses a 1/4" port and delivers 982 N push and 825 N pull at 0.5 MPa, rising to 1374 N push at 0.7 MPa. This compact extruded-aluminium body is shorter than a standard cylinder of the same bore and pairs with FA or LB mounts.
Because this SKU lacks a magnet it cannot take a switch. The drop-in replacement is the SAUJ50X125-40, which keeps the same bore, stroke, force, 1/4" port and SC-series mounting. Upgrading to the SAUJ moves you to current CMSG/DMSG/EMSG sensors (the SUJ used legacy CS1-B/DS1-B). For sizing, the 982 N push at 0.5 MPa gives a safe working load of about 589 N, or a vertical lift of roughly 50 kg with a 2:1 margin. The stop screw sets the end position but is not a load lock; use an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ50X125-40 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X125-40 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X125-40 |
| Bore size | Ø50 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SU datasheet (now discontinued). The SAUJ50X125-40 carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAUJ50X125-40 produces the same force from the same bore — a true drop-in on output. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SUJ Adjustable Cylinder SUJ50X125-40
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SU-family variants: SUD (double rod), SUJ (adjustable stroke) — each maps to its SAU equivalent (SUD→SAUD, SUJ→SAUJ). The current SAU line adds the SAUF valve-integrated option.
Where the Airtac SUJ Adjustable Cylinder SUJ50X125-40 Is Used
Variable-depth pressing
Trimming the extend stroke by up to 40 mm on-site lets a single 125 mm cylinder press parts of different heights without changing the entire actuator.
Adjustable reject arms
Shortening the forward stroke to 85 mm accommodates varying product widths on a transfer line, preventing over-travel damage at the reject station.
Tunable positioning stops
The external stop screw provides a hard mechanical end position for pushing loads to a set point, which can be fine-tuned as pallet sizes change.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X125-40 with the SAUJ50X125-40
To replace the discontinued SUJ50X125-40, order the drop-in SAUJ50X125-40, which matches the 50 mm bore, 125 mm max stroke, 40 mm adjust window, 1/4" port and FA/LB mounting. When sizing both ways, the neighbouring 40 mm bore yields 628 N push at 0.5 MPa, while the 63 mm bore gives 1559 N push at 0.5 MPa. Choose the 40 mm adjust window if you need to cut the extend stroke down to 85 mm on-site; the stop screw sets end position but does not lock the load, so fit an external rod lock for vertical holding. Because this no-magnet SKU cannot take a switch, a move to the SAUJ lets you use current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B. For strokes of 300 mm or longer, verify side-load limits to avoid rod binding.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X125-40
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S): sensor family CS1-B → CMSG
- ✓ Mounting reused (FA/FB/CA/CB/LB)
- ✓ Need a built-in valve? → SAUF
Airtac SUJ Adjustable Cylinder SUJ50X125-40 FAQ
Yes, the SUJ50X125-40 is discontinued. The exact drop-in replacement is the SAUJ50X125-40, which shares the same 50 mm bore, 125 mm stroke, 40 mm adjust window, 1/4" port and FA/LB mounting. The SAUJ uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B.
The 50 mm bore provides 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa, with a theoretical max of 200 kgf at 1.0 MPa. The external stop screw shortens the extend stroke by up to 40 mm on-site, giving a usable travel of 85 to 125 mm. The stop sets end position but is not a load lock.
Related AirTAC SAU Cylinders
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