This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X125-50, 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 SUJ50X125-50
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X125-50 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 direct replacement is the SAUJ50X125-50, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X125-50
- 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 SUJ50X125-50
The AirTAC SUJ50X125-50 is a discontinued double-acting double-rod profile cylinder with a 125 mm nominal stroke and a 50 mm external stop screw window, letting you trim the extend stroke on-site down to 75 mm. This compact aluminum barrel is shorter than an ISO 15552 cylinder of the same bore. The direct replacement is the SAUJ50X125-50, which matches the 50 mm bore, 1/4" port, M16x1.5 rod thread, and 21 mm adjustable cushions exactly. Upgrading to the SAUJ moves you from legacy CS1-B/DS1-B sensors to current CMSG/DMSG/EMSG switches.
The external stop screw sets the end position but is not a load lock; without live air the piston drifts, so use an external rod lock for held loads. This non-magnetic SKU cannot take a switch.
Airtac SUJ Adjustable Cylinder SUJ50X125-50 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X125-50 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X125-50 |
| 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 SAUJ50X125-50 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 SAUJ50X125-50 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 SUJ50X125-50
| 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 SUJ50X125-50 Is Used
Variable Depth Drilling
A machining fixture needing field stroke tuning to accommodate multiple part heights without swapping cylinders, using the stop screw to set exact 75 to 125 mm extend positions.
Adjustable Carton Sealing
A packaging line handling various box sizes where the extend stroke must be trimmed on-site to prevent crushing, relying on the 50 mm adjustment window for rapid changeovers.
Tiered Pallet Stops
Warehousing operations requiring precise end-positioning at different pallet heights, using the external stop to shorten the extend stroke rather than adding external mechanical stops.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X125-50 with the SAUJ50X125-50
To replace the discontinued SUJ50X125-50, order the SAUJ50X125-50 direct: it retains the 50 mm bore, 125 mm max stroke, 50 mm adjust window, 1/4" port, and FA/LB mounting. Choose the 50 mm adjust window if you need to trim the extend stroke anywhere from 75 to 125 mm on-site, which often beats fitting a fixed SAU plus an external stop. Since this SKU lacks a magnet, you cannot mount a switch; if sensing is needed, select the -S version of the SAUJ and use CMSG/DMSG/EMSG sensors instead of the old CS1-B/DS1-B. For strokes of 300 mm or longer, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X125-50
- ✓ 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 SUJ50X125-50 FAQ
Yes, the SUJ50X125-50 is discontinued. The direct replacement is the SAUJ50X125-50, which matches the 50 mm bore, 125 mm stroke, 1/4" port, and FA/LB mounting. The SAUJ also supports the current CMSG/DMSG/EMSG sensors and the SAUF built-in-valve variant.
The 50 mm adjust window allows trimming the 125 mm extend stroke down to 75 mm on-site. The stop sets end position but is not a load lock; use an external rod lock for held loads.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X125-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ50X125-50 replacement — usually within 7-8 hours.