This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X120-20, 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 SUJ50X120-20
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X120-20 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 SAUJ50X120-20, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke120 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X120-20
- 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 SUJ50X120-20
The AirTAC SUJ50X120-20 is a double-acting double-rod profile cylinder with a 120 mm nominal stroke and a 20 mm adjustable extend window, letting you trim the forward stroke on-site down to 100 mm via an external stop screw. 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.
This SUJ model is discontinued and the direct replacement is the SAUJ50X120-20, retaining the exact bore, stroke, force, port, and FA/LB mounting. The SAUJ upgrade shifts sensing to current CMSG/DMSG/EMSG sensors, whereas this legacy unit used CS1-B/DS1-B switches. Because this specific SKU lacks a magnet, it cannot take a magnetic switch.
Airtac SUJ Adjustable Cylinder SUJ50X120-20 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X120-20 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X120-20 |
| 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 SAUJ50X120-20 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 SAUJ50X120-20 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 SUJ50X120-20
| 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 SUJ50X120-20 Is Used
Custom Stroke Ejection
Tuning a parts ejector on an assembly line where the forward reach must be dialed in precisely between 100 and 120 mm to clear varying fixture heights without re-plumbing the pneumatic system.
Adjustable Transfer Stop
Acting as an end-of-line stop gate on a conveyor that handles mixed product lengths, allowing operators to shorten the extend stroke by up to 20 mm on-site to accommodate different package profiles.
Variable Depth Pusher
Pushing cartons into varying case sizes on a packing station, using the external stop screw to set the exact 100 to 120 mm extend position needed for each carton depth without swapping the cylinder.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X120-20 with the SAUJ50X120-20
To replace the discontinued SUJ50X120-20, order the direct replacement SAUJ50X120-20, which matches the 50 mm bore, 120 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. Select the 20 mm adjust window if your extend stroke needs on-site tuning between 100 and 120 mm, which beats installing a fixed SAU plus an external stop. Since this SKU has no magnet, it cannot support sensing; the SAUJ requires CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B. For strokes of 300 mm or longer, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X120-20
- ✓ 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 SUJ50X120-20 FAQ
Yes, the SUJ50X120-20 is discontinued. The direct replacement is the SAUJ50X120-20, which matches the 50 mm bore, 120 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 switches used on this SUJ.
The external stop screw window is 20 mm, allowing you to trim the nominal 120 mm extend stroke down to 100 mm on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X120-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ50X120-20 replacement — usually within 7-8 hours.