This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X300-40S, 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 SUJ40X300-40S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X300-40S 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 SAUJ40X300-40S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X300-40S
- 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 SUJ40X300-40S
The AirTAC SUJ40X300-40S is a double-acting double-rod adjustable-stroke profile cylinder. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, giving a usable 260-300 mm range from the 300 mm nominal maximum. The extruded aluminum profile barrel is notably shorter than an ISO 15552 cylinder of the same bore. It features a 16 mm rod, M12x1.25 rod thread, and a 1/4" port.
The SAUJ upgrades to current CMSG/DMSG/EMSG sensors, whereas this SUJ used legacy CS1-B/DS1-B switches. Note the stop screw sets end position only—it is not a load lock; use an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ40X300-40S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X300-40S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X300-40S |
| 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 SAUJ40X300-40S 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 SAUJ40X300-40S 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 SUJ40X300-40S
| 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 SUJ40X300-40S Is Used
Variable-Length Clamping
Adjusting the extend stroke on-site by up to 40 mm allows a single cylinder to clamp parts of varying heights without swapping out the entire actuator.
Transfer Line Diverter
Tuning the stroke end position lets operators fine-tune the pusher distance on a conveyor to accommodate different package sizes reaching the next station.
Adjustable Stops
The external stop screw provides a hard mechanical end position for sorting applications, allowing quick field changes to the 260-300 mm extend length.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X300-40S with the SAUJ40X300-40S
To replace the SUJ40X300-40S, order the direct replacement SAUJ40X300-40S, which preserves the 40 mm adjust window, 1/4" port, and FA/LB mounting. If you need position feedback, the SAUJ uses current CMSG/DMSG/EMSG sensors instead of this model's legacy CS1-B/DS1-B switches. Because the stroke is 300 mm, add external guides to prevent rod bending and manage side loads. The external stop screw sets the extend end position but is not a lock—never rely on it or the air cushions to hold a load without live air; add a pilot-operated check valve or external rod lock for suspended loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X300-40S
- ✓ 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 SUJ40X300-40S FAQ
Yes, the SUJ40X300-40S is discontinued. The direct replacement is the SAUJ40X300-40S, which matches the 40 mm bore, 300 mm stroke, 40 mm adjust window, 1/4" port, and FA/LB mounting. The SAUJ also uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches.
The external stop screw provides a 40 mm adjust window, shortening the extend stroke from the 300 mm nominal maximum down to 260 mm. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X300-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X300-40S replacement — usually within 7-8 hours.