This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X120-20S, 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 SUJ50X120-20S
The AirTAC SUJ Adjustable Cylinder SUJ50X120-20S is a double-acting profile-type standard cylinder with a Ø50mm bore and 120mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ50X120-20S, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke120 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X120-20S
- 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 SUJ50X120-20S
The AirTAC SUJ50X120-20S 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, yielding a usable 100-120 mm extension from the 120 mm nominal maximum. The extruded aluminum profile barrel is notably shorter than an ISO 15552 cylinder of the same bore.
This SUJ50X120-20S unit is discontinued; the direct replacement is the SAUJ50X120-20S, retaining the same bore, stroke, force, port, and FA/LB mounting. The integrated piston magnet (-S) functioned with legacy CS1-B/DS1-B switches, whereas the SAUJ upgrade uses current CMSG/DMSG/EMSG sensors. Note 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 SUJ50X120-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X120-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X120-20S |
| Bore size | Ø50 mm |
| Stroke | 120 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 SAUJ50X120-20S 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 SAUJ50X120-20S 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 SUJ50X120-20S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×120 | 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 SUJ50X120-20S Is Used
Probe Contact Tuning
Testing stations needing precise probe touch depth can dial in the extend stroke by up to 20 mm on-site, avoiding mechanical shim adjustments.
Variable-Length Diverter
Sorting lines handling mixed package sizes can field-adjust the diverter stroke between 100 and 120 mm to match carton profiles without swapping cylinders.
Fill Height Adjustment
Filling machines can fine-tune the nozzle insertion depth on-site using the stop screw to accommodate different container heights.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X120-20S with the SAUJ50X120-20S
To replace the discontinued SUJ50X120-20S, order the direct replacement SAUJ50X120-20S, which matches the 50 mm bore, 120 mm nominal stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. Choose the 20 mm adjust window if you need field-tuning of the extend end position; the stop screw shortens extension by up to 20 mm but is not a load lock. For the -S magnet, swap legacy CS1-B/DS1-B switches for current CMSG/DMSG/EMSG sensors. Because the nominal stroke is 120 mm, side-load alignment is generally forgiving, but always verify rod guidance for stroke lengths of 300 mm or greater.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X120-20S
- ✓ 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 SUJ50X120-20S FAQ
Yes, the AirTAC SUJ50X120-20S is discontinued. The direct replacement is the SAUJ50X120-20S. It matches the 50 mm bore, 120 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. The SAUJ also adds the SAUF built-in-valve variant and uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches.
The external stop screw allows you to trim the extend stroke by up to 20 mm on-site, giving a usable extension range of 100-120 mm. The stop sets end position only and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X120-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ50X120-20S replacement — usually within 7-8 hours.