This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X125-20, 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 SUJ50X125-20
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X125-20 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 SAUJ50X125-20, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X125-20
- 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 SUJ50X125-20
The AirTAC SUJ50X125-20 is a double-acting double-rod profile cylinder with a 125 mm nominal stroke and a 20 mm external stop screw window, letting you trim the extend stroke on-site to a usable 105-125 mm. The 1/4" port and M16x1.5 rod end are fixed by the 50 mm bore. The direct replacement is the SAUJ50X125-20, matching the bore, stroke, force, and SC-series FA/LB mounting.
The stop screw sets the end position but is not a load lock; the cylinder drifts on air loss. The SAUJ upgrade adopts current CMSG/DMSG/EMSG sensors, replacing the legacy CS1-B/DS1-B switches used here. Since this SKU lacks a magnet, it cannot take a switch.
Airtac SUJ Adjustable Cylinder SUJ50X125-20 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X125-20 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X125-20 |
| 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 SAUJ50X125-20 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 SAUJ50X125-20 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 SUJ50X125-20
| 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 SUJ50X125-20 Is Used
Variable Pitch Pushing
Feeding parts of differing widths on a single line by dialing the extend stroke within the 105-125 mm window without swapping cylinders.
Adjustable Diverter Gate
Tuning a diverting flap's reach on-site to accommodate new package sizes, using the 20 mm external stop to set the exact end position.
Crush-Sensitive Forming
Setting a precise 110 mm extend to press delicate materials, relying on the stop screw to establish a hard, repeatable mechanical endpoint.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X125-20 with the SAUJ50X125-20
To replace this discontinued SUJ50X125-20, order the SAUJ50X125-20 direct: it preserves the 50 mm bore, 125 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounts. Choose the 20 mm adjust window if you need field tuning between 105 and 125 mm. Because this exact SKU has no magnet, it cannot accept a sensor; upgrading to an SAUJ with the -S suffix enables CMSG/DMSG/EMSG switches. For strokes of 300 mm or longer, verify your side-load limits to prevent guide wear. The stop screw sets end position only; use an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X125-20
- ✓ 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 SUJ50X125-20 FAQ
Yes, the SUJ50X125-20 is discontinued. The direct replacement is the SAUJ50X125-20, which matches the 50 mm bore, 125 mm stroke, 20 mm adjust window, 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 nominal 125 mm extend stroke can be shortened by up to 20 mm on-site, yielding a usable 105-125 mm stroke. The stop screw sets end position only and does not lock the load.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X125-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ50X125-20 replacement — usually within 7-8 hours.