This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X50-20SFA, 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 SUJ40X50-20SFA
The AirTAC SUJ Adjustable Cylinder SUJ40X50-20SFA 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 SAUJ40X50-20SFA, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X50-20SFA
- 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 SUJ40X50-20SFA
The AirTAC SUJ40X50-20SFA is a discontinued double-acting double-rod profile cylinder with a 50 mm maximum extend stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 30-50 mm end position. This unit includes a piston magnet (-S) for legacy CS1-B/DS1-B sensors and an FA mount interface.
As this SUJ series is end-of-life, the direct replacement is the SAUJ40X50-20SFA, retaining the same bore, stroke, force, and SC-series mounting. The SAUJ upgrades to current CMSG/DMSG/EMSG sensors. Remember the stop screw sets end position only; it is not a load lock, so use an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ40X50-20SFA Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X50-20SFA |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X50-20SFA |
| 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 SAUJ40X50-20SFA 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 SAUJ40X50-20SFA 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 SUJ40X50-20SFA
| 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 SUJ40X50-20SFA Is Used
Diverter Gate Calibration
Trimming the extend stroke by up to 20 mm on-site allows precise positioning of pneumatic diverter gates without machining new hard stops.
Product Reject Arms
Adjustable extend positions let one cylinder handle multiple product sizes on a conveyor line, tuning the 50 mm stroke down to 30 mm as needed.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X50-20SFA with the SAUJ40X50-20SFA
To replace the discontinued SUJ40X50-20SFA, order the direct replacement SAUJ40X50-20SFA, which preserves the 40 mm bore, 50 mm nominal stroke, 20 mm adjust window, 1/4" port, and FA mounting. Choose the 20 mm adjust window when you need field-tuning of the extend stroke between 30 and 50 mm without adding an external stop. The -S magnet on the new SAUJ requires CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches. For strokes of 300 mm or longer, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X50-20SFA
- ✓ 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 SUJ40X50-20SFA FAQ
Yes, the SUJ40X50-20SFA is discontinued. The direct replacement is the SAUJ40X50-20SFA, which shares the same profile body, 40 mm bore, 50 mm stroke, 20 mm adjust window, 1/4" port, and FA mounting. You will only need to upgrade the position sensors from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG switches.
The external stop screw provides a 20 mm adjust window, meaning you can shorten the 50 mm maximum extend stroke down to 30 mm on-site. The stop sets end position but is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X50-20SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X50-20SFA replacement — usually within 7-8 hours.