This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAU40X255, 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 SU32~50 Standard Cylinder SU40X255
The AirTAC Airtac SU32~50 Standard Cylinder SU40X255 is a double-acting profile-type standard cylinder with a Ø40mm bore and 255mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAU40X255, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke255 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAU40X255
- 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 SU32~50 Standard Cylinder SU40X255
The AirTAC SU40X255 is a discontinued double-acting profile-type cylinder featuring a 40mm bore, 255mm stroke, and an extruded aluminum barrel that is more compact than a same-bore ISO 15552 unit. It delivers 628 N push force at 0.5 MPa through a 1/4" port. AirTAC replaced this EOL model with the SAU40X255 direct replacement, matching the exact bore, stroke, output force, port size, and SC-series mounting.
When upgrading, note the SAU body uses current CMSG/DMSG/EMSG sensors, whereas this legacy version lacked a magnet entirely and cannot accept any switch. The new SAU line also introduces a SAUF variant with a built-in 4M solenoid valve the SU never offered.
Airtac SU32~50 Standard Cylinder SU40X255 Technical Specifications
| Model | Airtac SU32~50 Standard Cylinder SU40X255 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAU40X255 |
| Bore size | Ø40 mm |
| Stroke | 255 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 SAU40X255 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 SAU40X255 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SU32~50 Standard Cylinder SU40X255
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×255 | 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 SU32~50 Standard Cylinder SU40X255 Is Used
Package Diverting
Pushes light to medium cartons off a sorting line using a safe 377 N working load, with the 255mm stroke clearing guide rails.
Pallet Stops
Acts as a pneumatic stop for inbound pallets, handling the impact via adjustable 21mm air cushions at both ends.
Clamp Actuation
Drives a secondary clamping arm on a machining fixture, delivering 628 N of push force at 0.5 MPa to hold aluminum parts.
Replacing the Airtac SU32~50 Standard Cylinder SU40X255 with the SAU40X255
To replace this SU40X255, order the SAU40X255. Confirm the 1/4" port, M12x1.25 rod thread, and SC-series mounting (LB/FA/FB/CA/CB) match your jig. Because this specific SKU has no -S magnet, it cannot hold a sensor; if you need position detection on the SAU, you must order the -S version and use CMSG/DMSG/EMSG switches. For loads needing 879 N at 0.7 MPa, the 50mm bore offers a step up, while the 32mm bore offers 402 N for lighter tasks. At 255mm stroke, guide the load to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the 21mm cushions only decelerate—so fit an external rod lock or pilot-operated check valve for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAU40X255
- ✓ 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 SU32~50 Standard Cylinder SU40X255 FAQ
Yes, the SU40X255 is discontinued. The direct replacement is the AirTAC SAU40X255. It shares the identical 40mm bore, 255mm stroke, 628 N force at 0.5 MPa, 1/4" port, and SC-series mounting accessories, so it bolts right into the same application.
At 0.5 MPa it pushes 628 N and pulls 528 N. At 0.7 MPa it pushes 879 N, 1130 N at 0.9 MPa, with a theoretical max of 128 kgf at 1.0 MPa. The cylinder does not hold load on air loss—the cushions only decelerate—so use an external rod lock for vertical holding. This no-S SKU also lacks a magnet and cannot take a sensor.
Request a Quote for the SAU40X255
Send us the quantity and destination. We confirm price, stock and lead time on the SAU40X255 replacement — usually within 7-8 hours.