This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X125-40S, 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 SUJ50X125-40S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X125-40S 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 SAUJ50X125-40S, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X125-40S
- 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 SUJ50X125-40S
The AirTAC SUJ50X125-40S is a double-acting double-rod profile cylinder with an external stop screw that lets you trim the extend stroke by up to 40 mm on-site, yielding a usable 85-125 mm extension out of the 125 mm nominal maximum. It features a 1/4" port, an M16x1.5 rod thread, and 21 mm adjustable air cushions at each end.
This SUJ unit is discontinued; the direct replacement is the SAUJ50X125-40S, which preserves the bore, stroke, force, port, and FA/LB mounting. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors, whereas the SAUJ successor upgrades to current CMSG/DMSG/EMSG switches. Note that the stop screw sets the end position but is not a load lock; an external rod lock is required to hold loads on air loss.
Airtac SUJ Adjustable Cylinder SUJ50X125-40S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X125-40S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X125-40S |
| 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 SAUJ50X125-40S 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 SAUJ50X125-40S 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 SUJ50X125-40S
| 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 SUJ50X125-40S Is Used
Variable Pitch Pushing
Dialing in the exact part-contact distance on a 125 mm extend by trimming up to 40 mm on-site, avoiding the need to machine hard stops for each product variant.
Adjustable Forming Press
Setting precise lower dead-center for a 50 kg forming operation, using the 85-125 mm usable stroke window to accommodate different material thicknesses without swapping cylinders.
Dynamic Diverter Arm
Tuning the extend endpoint by up to 40 mm to alter the divert angle on a conveyor line, allowing rapid reconfiguration for changing package sizes.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X125-40S with the SAUJ50X125-40S
To replace the discontinued SUJ50X125-40S, order the direct replacement SAUJ50X125-40S, matching the 50 mm bore, 125 mm max stroke, 1/4" port, and FA/LB mounting. Choose the 40 mm adjust window if your mechanism requires field tuning the extend stroke between 85 and 125 mm. For the -S magnet option, swap legacy CS1-B/DS1-B sensors for current CMSG/DMSG/EMSG switches. Because the 125 mm stroke is under 300 mm, side-load leverage is minimal, but always confirm pivot alignment. The external stop screw sets the end position and does not function as a load lock; use an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X125-40S
- ✓ 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 SUJ50X125-40S FAQ
Yes, the SUJ50X125-40S is discontinued. The direct replacement is the SAUJ50X125-40S, which matches the 50 mm bore, 125 mm max stroke, 1/4" port, and FA/LB mounting. The SAUJ also uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches.
The external stop screw has a 40 mm window, allowing you to shorten the 125 mm nominal extend stroke down to 85 mm on-site. The stop sets end position but is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X125-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ50X125-40S replacement — usually within 7-8 hours.