This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X125-40, 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 SUJ50X125-40
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X125-40 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 SAUJ50X125-40, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X125-40
- 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 SUJ50X125-40
The AirTAC SUJ50X125-40 is a discontinued 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, giving a usable forward travel of 85 to 125 mm. This compact extruded-aluminium body is shorter than a standard cylinder of the same bore and pairs with FA or LB mounts.
Because this SKU lacks a magnet it cannot take a switch. The direct replacement is the SAUJ50X125-40, which keeps the same bore, stroke, force, 1/4" port and SC-series mounting. Upgrading to the SAUJ moves you to current CMSG/DMSG/EMSG sensors (the SUJ used legacy CS1-B/DS1-B). The stop screw sets the end position but is not a load lock; use an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ50X125-40 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X125-40 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X125-40 |
| 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 SAUJ50X125-40 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 SAUJ50X125-40 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 SUJ50X125-40
| 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 SUJ50X125-40 Is Used
Variable-depth pressing
Trimming the extend stroke by up to 40 mm on-site lets a single 125 mm cylinder press parts of different heights without changing the entire actuator.
Adjustable reject arms
Shortening the forward stroke to 85 mm accommodates varying product widths on a transfer line, preventing over-travel damage at the reject station.
Tunable positioning stops
The external stop screw provides a hard mechanical end position for pushing loads to a set point, which can be fine-tuned as pallet sizes change.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X125-40 with the SAUJ50X125-40
To replace the discontinued SUJ50X125-40, order the direct replacement SAUJ50X125-40, which matches the 50 mm bore, 125 mm max stroke, 40 mm adjust window, 1/4" port and FA/LB mounting. Choose the 40 mm adjust window if you need to cut the extend stroke down to 85 mm on-site; the stop screw sets end position but does not lock the load, so fit an external rod lock for vertical holding. Because this no-magnet SKU cannot take a switch, a move to the SAUJ lets you use current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B. For strokes of 300 mm or longer, verify side-load limits to avoid rod binding.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X125-40
- ✓ 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 SUJ50X125-40 FAQ
Yes, the SUJ50X125-40 is discontinued. The direct replacement is the SAUJ50X125-40, which shares the same 50 mm bore, 125 mm stroke, 40 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.
The external stop screw shortens the extend stroke by up to 40 mm on-site, giving a usable travel of 85 to 125 mm. The stop sets end position but is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X125-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ50X125-40 replacement — usually within 7-8 hours.