This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X250-40, 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 SUJ40X250-40
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X250-40 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 SAUJ40X250-40, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke250 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X250-40
- 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 SUJ40X250-40
The AirTAC SUJ40X250-40 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. With a 40 mm bore and 250 mm nominal stroke, the usable extend range is 210-250 mm. The 1/4" port and M12x1.25 rod thread are fixed to this bore.
This SUJ model is discontinued; the direct replacement is the SAUJ40X250-40, sharing the same force, 1/4" port, and FA/LB mounting. The SAUJ upgrades to current CMSG/DMSG/EMSG sensors, whereas this legacy unit used CS1-B/DS1-B switches. The stop screw sets end position only; it is not a load lock, so use an external rod lock to hold loads.
Airtac SUJ Adjustable Cylinder SUJ40X250-40 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X250-40 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X250-40 |
| 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 SAUJ40X250-40 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 SAUJ40X250-40 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 SUJ40X250-40
| 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 SUJ40X250-40 Is Used
Adjustable End Stops
Dialing in the exact extend position of a clamping jaw on the fly without disassembling the cylinder or machining hard stops.
Variable Length Diverters
Tuning the extend stroke of a routing flap by up to 40 mm to accommodate different package sizes on a packaging line.
Prototype Positioning
Setting precise end positions during machine commissioning where the final extend distance is not yet finalized.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X250-40 with the SAUJ40X250-40
To replace the discontinued SUJ40X250-40, order the direct replacement SAUJ40X250-40, which matches the 40 mm bore, 250 mm stroke, 40 mm adjust window, and FA/LB mounts. Choose the 40 mm adjust window if you need on-site tuning between 210 and 250 mm, avoiding the cost of a fixed SAU plus external stop. Because this SKU lacks a magnet, it cannot take a switch; the SAUJ requires CMSG/DMSG/EMSG sensors. For this 250 mm stroke, verify side-load alignment to prevent rod binding. The stop screw sets end position but does not lock the load; add an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X250-40
- ✓ 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 SUJ40X250-40 FAQ
Yes, the SUJ40X250-40 is discontinued. The direct replacement is the SAUJ40X250-40, which shares the same 40 mm bore, 250 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 switches.
The external stop screw allows trimming the extend stroke by up to 40 mm on-site, yielding a usable range of 210-250 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X250-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X250-40 replacement — usually within 7-8 hours.