This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAU40X25STC, 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 SU40X25STC
The AirTAC Airtac SU32~50 Standard Cylinder SU40X25STC is a double-acting profile-type standard cylinder with a Ø40mm bore and 25mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAU40X25STC, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke25 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAU40X25STC
- 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 SU40X25STC
The AirTAC SU40X25STC is a discontinued double-acting profile-type cylinder with a 40 mm bore and 25 mm stroke. It delivers 628 N push force at 0.5 MPa through a 1/4" port. AirTAC replaced this unit with the SAU40X25STC, a direct upgrade retaining the exact bore, stroke, output force, and SC-series TC mounting interface.
Because the body is an extruded aluminum profile, it is more compact than a standard ISO 15552 unit of the same size. Note that the -S magnet on this legacy unit functioned with CS1-B/DS1-B switches, whereas the SAU replacement utilizes the current CMSG/DMSG/EMSG sensor family. The SAU line also introduces a SAUF variant with a built-in valve, an option the SU series never offered.
Airtac SU32~50 Standard Cylinder SU40X25STC Technical Specifications
| Model | Airtac SU32~50 Standard Cylinder SU40X25STC |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAU40X25STC |
| Bore size | Ø40 mm |
| Stroke | 25 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 SAU40X25STC 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 SAU40X25STC 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 SU40X25STC
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 SU40X25STC Is Used
Short-Stroke Clamping
Ideal for holding thin workpieces in machining fixtures, utilizing the 25 mm stroke and 628 N push force at 0.5 MPa for secure, low-travel clamping.
Package Diverting
Drives small diverting gates or sorting pop-up arms on conveyor lines where a fast, compact 40 mm bore actuator is needed to redirect lightweight goods.
Component Ejection
Ejects small molded or stamped parts from a press bed, taking advantage of the short stroke and the TC mount for tight machinery footprints.
Replacing the Airtac SU32~50 Standard Cylinder SU40X25STC with the SAU40X25STC
To replace this SU40X25STC, order the SAU40X25STC. Verify your 1/4" port thread (PT, G, or NPT) and the M12x1.25 rod end. The TC mounting accessory is an SC-series part that carries over directly to the new body. Because this SKU includes the -S magnet, you must account for the sensor family change: legacy CS1-B/DS1-B switches will not fit the SAU groove, so upgrade to CMSG/DMSG/EMSG sensors. If your application requires intermediate stopping or load holding on air loss, note that the adjustable 21 mm air cushions only decelerate the piston at stroke ends; an external rod lock or pilot-operated check valve is required for secure holding. If you need higher force, stepping up to a 50 mm bore yields 982 N push at 0.5 MPa, while dropping to a 32 mm bore reduces it to 402 N. The 25 mm stroke is very short, so side-load risks are minimal, but always ensure rigid guidance for the 16 mm rod.
Replacement checklist
- ✓ Same bore / stroke → SAU40X25STC
- ✓ 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 SU40X25STC FAQ
Yes, the AirTAC SU40X25STC is discontinued and end-of-life. The direct replacement is the SAU40X25STC. It features the same 40 mm bore, 25 mm stroke, 628 N output force at 0.5 MPa, 1/4" port, and utilizes the same SC-series TC mounting accessories.
At 0.5 MPa it provides 628 N push and 528 N pull force, increasing to 879 N push at 0.7 MPa, with a theoretical maximum of 128 kgf at 1.0 MPa. This -S model includes a piston magnet for legacy CS1-B/DS1-B switches; if you transition to the SAU replacement, you must upgrade to CMSG/DMSG/EMSG sensors.
Related AirTAC SAU Cylinders
Request a Quote for the SAU40X25STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAU40X25STC replacement — usually within 7-8 hours.