This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X250-20, 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 SUJ40X250-20
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X250-20 is a double-acting profile-type standard cylinder with a Ø40mm bore and 250mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X250-20, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke250 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X250-20
- 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 SUJ40X250-20
The AirTAC SUJ40X250-20 is a double-acting double-rod profile cylinder with an external stop screw that lets you trim the extend stroke by up to 20 mm on-site, giving a usable 230-250 mm stroke window out of the 250 mm nominal maximum. The direct replacement is the SAUJ40X250-20, matching the bore, stroke, force, and SC-series FA/LB mounting.
The stop screw sets the end position but is not a load lock; use an external rod lock for held loads. Because this SKU lacks a magnet, it cannot take a sensor, whereas the SAUJ upgrade accepts current CMSG/DMSG/EMSG switches instead of the legacy CS1-B/DS1-B.
Airtac SUJ Adjustable Cylinder SUJ40X250-20 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X250-20 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X250-20 |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| 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 SAUJ40X250-20 carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAUJ40X250-20 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 SUJ40X250-20
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SUJ40X250-20 Is Used
Custom Ejector Stroke
Dialing in the exact ejection point of a part on a machining line by trimming the extend stroke up to 20 mm on-site to accommodate varying material thicknesses.
Variable Length Diverter
Tuning a sorting gate actuator on a conveyor to handle different package sizes without swapping the entire cylinder body.
Adjustable Sealing Head
Fine-tuning the down-stroke end position on a packaging sealer to maintain consistent pressure across varying product heights.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X250-20 with the SAUJ40X250-20
To replace this discontinued unit, order the SAUJ40X250-20 (inserting an A after the S), which retains the exact 40 mm bore, 250 mm max stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. Choose the 20 mm adjust window if you need precise on-site extend trimming between 230 and 250 mm. Since this specific SKU has no magnet, it cannot accept a sensor; moving to the SAUJ lets you use current CMSG/DMSG/EMSG sensors rather than the legacy CS1-B/DS1-B. For this 250 mm stroke, verify side-load alignment to prevent rod binding. Remember the stop screw sets end position and is not a load lock—add an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X250-20
- ✓ 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 SUJ40X250-20 FAQ
Yes, the SUJ40X250-20 is discontinued. The direct replacement is the SAUJ40X250-20, which matches the 40 mm bore, 250 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. The SAUJ also accepts current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches.
The external stop screw provides a 20 mm adjust window, allowing you to shorten the extend stroke from the 250 mm maximum down to 230 mm. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X250-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X250-20 replacement — usually within 7-8 hours.