This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X250-20S, 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 SUJ40X250-20S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X250-20S 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 SAUJ40X250-20S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke250 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X250-20S
- 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 SUJ40X250-20S
The AirTAC SUJ40X250-20S is a double-acting, double-rod profile cylinder with a 250 mm nominal stroke and a 20 mm external stop screw, letting you trim the extend stroke on-site down to 230 mm. Built with an extruded aluminum profile barrel, it is more compact than an ISO 15552 cylinder of the same bore.
This SUJ model is discontinued; the direct replacement is the SAUJ40X250-20S, which matches the bore, stroke, force, port, and FA/LB mounting. The SAUJ upgrade uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches on this -S unit. 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 SUJ40X250-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X250-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X250-20S |
| 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 SAUJ40X250-20S 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 SAUJ40X250-20S 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 SUJ40X250-20S
| 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 SUJ40X250-20S Is Used
Variable Depth Diving Heads
Allows operators to tune the extend stroke on-site for material thickness variations without swapping the entire cylinder.
Adjustable Transfer Pushers
Fine-tunes the pusher end position to accommodate different package sizes on a shared conveyor line.
Carton Forming Stops
Sets precise flap folding depth on-site, enabling quick format changes between carton profiles.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X250-20S with the SAUJ40X250-20S
To replace the discontinued SUJ40X250-20S, order the direct replacement SAUJ40X250-20S, retaining the 40 mm bore, 250 mm stroke, 20 mm adjust window, and 1/4" port. Choose the 20 mm adjust window when you need precise field tuning of the extend stroke. Mounting remains compatible with SC-series FA and LB brackets. Because this unit has the -S magnet, you must upgrade your legacy CS1-B/DS1-B sensors to CMSG/DMSG/EMSG switches. For this 250 mm stroke, verify side-load alignment to prevent rod binding.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X250-20S
- ✓ 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 SUJ40X250-20S FAQ
Yes, the SUJ40X250-20S is discontinued. The direct replacement is the SAUJ40X250-20S, which matches the 40 mm bore, 250 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. You must upgrade the legacy CS1-B/DS1-B sensors to CMSG/DMSG/EMSG switches.
The external stop screw provides a 20 mm adjust window, shortening the 250 mm extend stroke down to 230 mm. The stop sets end position but is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X250-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X250-20S replacement — usually within 7-8 hours.