This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X300-20S, 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 SUJ40X300-20S
The AirTAC SUJ Adjustable Cylinder SUJ40X300-20S is a double-acting profile-type standard cylinder with a Ø40mm bore and 300mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X300-20S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X300-20S
- 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 SUJ40X300-20S
The AirTAC SUJ40X300-20S is a double-acting, double-rod profile cylinder with an adjustable stroke, discontinued and replaced by the direct replacement SAUJ40X300-20S. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, providing a usable 280-300 mm window where 300 mm is the maximum. The SAUJ successor retains the exact bore, stroke, force, and SC-series FA/LB mounting, but upgrades sensing to current CMSG/DMSG/EMSG switches from the legacy CS1-B/DS1-B used here.
The stop screw sets the end position but is not a load lock; on air loss the piston drifts, so use an external rod lock for held loads. The compact extruded aluminum barrel is shorter than an ISO 15552 cylinder of the same bore. At the 300 mm stroke, external guides are recommended to prevent rod bending from side loads.
Airtac SUJ Adjustable Cylinder SUJ40X300-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X300-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X300-20S |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAUJ40X300-20S 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 SAUJ40X300-20S 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 SUJ40X300-20S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SUJ40X300-20S Is Used
Variable Depth Drilling
Adjusts the extend stroke by up to 20 mm on-site to tune drill depth for different material thicknesses without changing cylinders.
Variable Length Diverting
Trims the 300 mm extend stroke on a diverting gate to handle changing package sizes dynamically on the line.
Adjustable Forming Stops
Sets precise end positions for packaging flaps or forming tools, allowing 280-300 mm of travel flexibility.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X300-20S with the SAUJ40X300-20S
To replace the discontinued SUJ40X300-20S, use the exact direct replacement SAUJ40X300-20S, which preserves the 40 mm bore, 300 mm max stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. The 20 mm adjust window is ideal when exact extend endpoints vary by up to 20 mm, often beating a fixed SAU cylinder plus an external stop. Because this is an -S model, note the sensor change from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG on the SAUJ. For this 300 mm stroke, add external guides to manage side loads and prevent rod bending.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X300-20S
- ✓ 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 SUJ40X300-20S FAQ
Yes, the SUJ40X300-20S is discontinued. The direct replacement is the SAUJ40X300-20S, which matches the 40 mm bore, 300 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. The SAUJ upgrades the sensors to current CMSG/DMSG/EMSG switches from the legacy CS1-B/DS1-B.
The external stop screw provides a 20 mm adjust window, making the usable extend stroke 280-300 mm. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X300-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X300-20S replacement — usually within 7-8 hours.