This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X50-20, with the same bore, stroke, output force, port and mounting, so it fits the same application. 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 SUJ40X50-20
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X50-20 is a double-acting profile-type standard cylinder with a Ø40mm bore and 50mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X50-20, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X50-20
- 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 SUJ Adjustable Cylinder SUJ40X50-20
The AirTAC SUJ40X50-20 is a double-acting double-rod profile cylinder with an external stop screw that lets you trim the extend stroke by up to 20 mm on-site, giving a usable 30-50 mm stroke from the 50 mm nominal maximum. This SUJ model is discontinued; the direct replacement is the SAUJ40X50-20, which matches the bore, stroke, force, port, and FA/LB mounting.
The stop screw sets the end position but is not a load lock; a plain cylinder drifts on air loss, so use an external rod lock for held loads. The SAUJ upgrade uses current CMSG/DMSG/EMSG sensors, whereas this legacy SKU lacks a magnet and cannot take a switch.
Airtac SUJ Adjustable Cylinder SUJ40X50-20 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X50-20 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X50-20 |
| Bore size | Ø40 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| 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 SAUJ40X50-20 carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAUJ40X50-20 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SUJ Adjustable Cylinder SUJ40X50-20
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SUJ40X50-20 Is Used
Diverter Gate Adjustment
Tuning the extend stroke on-site by up to 20 mm to set the exact position of a diverter gate without swapping cylinders.
Variable Length Stops
Adjusting the stroke end position for different package sizes on a conveyor line where the stop screw sets the exact contact point.
Clamp Positioning
Trimming the extend stroke to accommodate varying material widths in a clamping fixture, ensuring precise holding without reprogramming.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X50-20 with the SAUJ40X50-20
To replace the discontinued SUJ40X50-20, order the SAUJ40X50-20 direct. Choose the 20 mm adjust window if you need field tuning between 30 and 50 mm. Mounting uses FA or LB brackets (SC-series compatible). Because this SKU has no magnet, you cannot add a switch; the SAUJ upgrade requires CMSG/DMSG/EMSG sensors instead of legacy CS1-B/DS1-B. For stroke lengths of 300 mm or more, verify your side-load limits.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X50-20
- ✓ 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 SUJ40X50-20 FAQ
Yes, the SUJ40X50-20 is discontinued. The direct replacement is the SAUJ40X50-20, which matches the 40 mm bore, 50 mm stroke, 20 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 external stop screw window is 20 mm, allowing you to trim the 50 mm nominal extend stroke down to 30 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X50-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X50-20 replacement — usually within 7-8 hours.