This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X250-40S, 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 SUJ40X250-40S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X250-40S 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 SAUJ40X250-40S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke250 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X250-40S
- 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 SUJ40X250-40S
The AirTAC SUJ40X250-40S 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, giving a usable extend range of 210 to 250 mm. The stop screw sets the end position but is not a load lock; an external rod lock is required for held loads.
The direct replacement is the SAUJ40X250-40S, sharing the same bore, stroke, force, port, and FA/LB mounting. The SAUJ upgrade transitions from legacy CS1-B/DS1-B sensors to current CMSG/DMSG/EMSG switches while retaining the compact profile barrel that is shorter than standard cylinders.
Airtac SUJ Adjustable Cylinder SUJ40X250-40S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X250-40S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X250-40S |
| 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 SAUJ40X250-40S 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 SAUJ40X250-40S 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 SUJ40X250-40S
| 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 SUJ40X250-40S Is Used
Variable Pitch Indexing
Feeds parts of differing lengths on a conveyor by trimming the extend stroke up to 40 mm on-site, avoiding the need to swap entire actuators when product dimensions change.
Adjustable Carton Sealing
Accommodates fluctuating box heights in a packaging line by fine-tuning the extend end-position, ensuring consistent sealing pressure without mechanical retooling.
Custom Length Cutting Stops
Acts as an adjustable hard stop for a cutting station, allowing operators to dial in the extend stroke precisely within the 210 to 250 mm window for varied material lengths.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X250-40S with the SAUJ40X250-40S
To replace this discontinued model, specify the SAUJ40X250-40S as a direct, matching the 40 mm bore, 250 mm stroke, 40 mm adjust window, 1/4" port, and FA/LB mounting. The 40 mm adjust window is ideal if your end-stop varies by up to 40 mm, avoiding the need for a fixed SAU plus an external stop. Because this is an -S model, swap the legacy CS1-B/DS1-B sensors for CMSG/DMSG/EMSG switches. For this 250 mm stroke, verify side-load alignment to prevent rod seal wear.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X250-40S
- ✓ 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 SUJ40X250-40S FAQ
Yes, the SUJ40X250-40S is discontinued. The direct replacement is the SAUJ40X250-40S, which matches the 40 mm bore, 250 mm stroke, 40 mm adjust window, 1/4" port, and FA/LB mounting. You will need to upgrade the position sensing from legacy CS1-B/DS1-B switches to the current CMSG/DMSG/EMSG series.
The external stop screw provides a 40 mm adjust window, allowing you to shorten the extend stroke from the 250 mm maximum down to 210 mm on-site. The stop sets end position only and does not lock the load.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X250-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X250-40S replacement — usually within 7-8 hours.