This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X30-20S, 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 SUJ40X30-20S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X30-20S is a double-acting profile-type standard cylinder with a Ø40mm bore and 30mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X30-20S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke30 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X30-20S
- 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 SUJ40X30-20S
The AirTAC SUJ40X30-20S is a double-acting double-rod profile cylinder with a 40mm bore and a 30mm nominal extend stroke. An external stop screw lets you trim the extend stroke by up to 20mm on-site, yielding a usable 10-30mm stroke window. The stop screw strictly sets the end position and is not a load lock.
This SUJ40X30-20S model is discontinued and the direct replacement is the SAUJ40X30-20S, retaining the same profile body, bore, force, and FA/LB mounting. The new SAUJ uses current CMSG/DMSG/EMSG sensors, whereas this legacy unit used CS1-B/DS1-B switches. A plain cylinder drifts on air loss, so add an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ40X30-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X30-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X30-20S |
| Bore size | Ø40 mm |
| Stroke | 30 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 SAUJ40X30-20S 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 SAUJ40X30-20S 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 SUJ40X30-20S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 SUJ40X30-20S Is Used
Short-Stroke Probe Positioning
Trimming the extend stroke down to 10mm on-site allows precise contact force for delicate testing probes without machining custom spacers.
Adjustable Ejector Pins
Dialing in the 20mm adjust window lets operators set exact ejection distances for varying part sizes on a shared fixture.
Custom Spacer Elimination
Using the external stop screw to set a 15mm stroke removes the need to fabricate and install physical internal spacers for short pushes.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X30-20S with the SAUJ40X30-20S
To replace the discontinued SUJ40X30-20S, order the direct replacement SAUJ40X30-20S, which matches the 40mm bore, 30mm nominal stroke, 20mm adjust window, and 1/4" port. Choose the 20mm adjust window if you need to trim the extend stroke down to a 10mm minimum on-site. The -S suffix means a piston magnet is present; you must upgrade from legacy CS1-B/DS1-B switches to CMSG/DMSG/EMSG sensors on the SAUJ. Mounting is compatible with AirTAC SC-series FA and LB brackets. Because the nominal stroke is 30mm (under 300mm), side-load rod deflection is minimal, but always confirm guiding. The stop screw sets end position only; it does not lock the load.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X30-20S
- ✓ 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 SUJ40X30-20S FAQ
Yes, the SUJ40X30-20S is discontinued. The direct replacement is the SAUJ40X30-20S, which matches the 40mm bore, 30mm stroke, 20mm adjust window, 1/4" port, and FA/LB mounting. You must upgrade the position sensors from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG switches.
The external stop screw provides a 20mm adjust window, allowing you to shorten the 30mm nominal extend stroke down to 10mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X30-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X30-20S replacement — usually within 7-8 hours.