This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X125-20S, 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 SUJ50X125-20S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X125-20S 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 SAUJ50X125-20S, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X125-20S
- 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 SUJ50X125-20S
The AirTAC SUJ50X125-20S is a discontinued double-acting double-rod profile cylinder with a 125 mm maximum extend stroke and a 20 mm external stop screw window, letting you trim the extend stroke on-site to a usable 105-125 mm. Bore is 50 mm with a 1/4" port and M16x1.5 rod thread. The direct replacement is the SAUJ50X125-20S, retaining the same 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. This compact profile barrel is shorter than an ISO 15552 cylinder of the same bore. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches; the SAUJ successor transitions to current CMSG/DMSG/EMSG sensors.
Airtac SUJ Adjustable Cylinder SUJ50X125-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X125-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X125-20S |
| 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 SAUJ50X125-20S 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 SAUJ50X125-20S 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 SUJ50X125-20S
| 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 SUJ50X125-20S Is Used
Probe Contact Adjustment
Testing fixtures needing precise probe contact depth can trim the extend stroke by up to 20 mm on-site to accommodate different product heights without reprogramming the motion controller.
Variable Length Diverter
Sorting lines handling mixed package lengths use the external stop screw to fine-tune the actuator reach on-site, preventing package damage during lane diverts.
Variable Height Stops
Pallet handling stations adjust the extend stroke within the 105-125 mm window to create different mechanical stop positions for varying pallet footprints.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X125-20S with the SAUJ50X125-20S
To replace the discontinued SUJ50X125-20S, order the direct replacement SAUJ50X125-20S, which preserves the 50 mm bore, 125 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. Choose the 20 mm adjust window if your mechanism needs field stroke tuning between 105 and 125 mm without machining a custom fixed stroke. For stroke lengths of 300 mm or more, verify side-load constraints to prevent guide bushing wear. The SAUJ uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches on this SUJ. Mounting compatibility is limited to the AirTAC SC series.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X125-20S
- ✓ 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 SUJ50X125-20S FAQ
Yes, the SUJ50X125-20S is discontinued. The direct replacement is the SAUJ50X125-20S, matching the 50 mm bore, 125 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. The SAUJ successor uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches.
The 20 mm external stop screw window allows trimming the 125 mm extend stroke down to 105 mm on-site. The stop sets end position but does not lock the load.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X125-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ50X125-20S replacement — usually within 7-8 hours.