This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X25-20S, 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 SUJ40X25-20S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X25-20S 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 SAUJ40X25-20S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke25 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X25-20S
- 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 SUJ40X25-20S
The AirTAC SUJ40X25-20S is a double-acting double-rod profile cylinder with a 40mm bore and 25mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 20mm on-site, giving a usable 5-25mm end position. This compact extruded aluminum barrel is shorter than standard cylinders of the same bore.
This SUJ40X25-20S model is discontinued and the direct replacement is the SAUJ40X25-20S, retaining the same bore, stroke, force, port, and FA/LB mounting. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B switches; the SAUJ upgrade moves to current CMSG/DMSG/EMSG sensors. Note the stop screw sets end position but is not a load lock; use an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ40X25-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X25-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X25-20S |
| 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 SAUJ40X25-20S 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 SAUJ40X25-20S 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 SUJ40X25-20S
| 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 SUJ Adjustable Cylinder SUJ40X25-20S Is Used
Short-Stroke Clamping
Adjusts the extend contact point on the fly for delicate part clamping where a fixed 25mm stroke would crush the component.
Dynamic Diverter Positioning
Tunes the actuator stop length on-site to redirect varying package sizes on a conveyor line without changing cylinder hardware.
Compact Ejection
Fits tight machinery footprints while allowing operators to dial in the exact ejection distance needed for different product runs.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X25-20S with the SAUJ40X25-20S
To replace the discontinued SUJ40X25-20S, order the direct replacement SAUJ40X25-20S, which matches the 40mm bore, 25mm nominal stroke, 20mm adjust window, 1/4" port, and FA/LB mounting. Choose the 20mm adjust window if you need field stroke tuning between 5mm and 25mm; a fixed SAU cylinder with an external stop lacks this integrated trim capability. If your stroke was 300mm or longer, verify side-load limits on the rod end. The -S magnet on your legacy cylinder used CS1-B/DS1-B switches, which must be upgraded to CMSG/DMSG/EMSG sensors on the new SAUJ body.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X25-20S
- ✓ 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 SUJ40X25-20S FAQ
Yes, the SUJ40X25-20S is discontinued. The direct replacement is the SAUJ40X25-20S. It matches the 40mm bore, 25mm stroke, 20mm adjust window, 1/4" port, and FA/LB mounting. You must upgrade your -S piston magnet sensors from legacy CS1-B/DS1-B to the current CMSG/DMSG/EMSG switches.
The external stop screw window is 20mm, allowing you to trim the 25mm nominal extend stroke down to a 5mm minimum on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X25-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X25-20S replacement — usually within 7-8 hours.