This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X30-20, 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 SUJ40X30-20
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X30-20 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 SAUJ40X30-20, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke30 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X30-20
- 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 SUJ40X30-20
The AirTAC SUJ40X30-20 is a discontinued double-acting double-rod profile cylinder with an external stop screw that lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 10-30 mm extend window from its 30 mm nominal maximum. Its extruded aluminum profile barrel is notably shorter than an ISO 15552 cylinder of the same bore. The direct replacement is the SAUJ40X30-20, which matches the 40 mm bore, 30 mm stroke, 1/4" port, and FA/LB mounting. Upgrading to the SAUJ moves you to current CMSG/DMSG/EMSG sensors, as this legacy model used CS1-B/DS1-B switches.
This SKU has no magnet and cannot accept a sensor. The stop screw sets the end position but is not a load lock; without live air the piston drifts, so use an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ40X30-20 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X30-20 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X30-20 |
| 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 SAUJ40X30-20 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 SAUJ40X30-20 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 SUJ40X30-20
| 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 SUJ40X30-20 Is Used
Short-Stroke Clamping
Ideal for clamping parts where the exact contact point varies by up to 20 mm, allowing on-site extend tuning without swapping cylinders.
Variable Transfer Stops
Useful on conveyor lines where the stop position must be fine-tuned in the field to accommodate different product lengths on the fly.
Compact Push Operations
Fits in tight machinery spaces thanks to the short profile barrel, providing adjustable 10-30 mm push strokes for light assembly tasks.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X30-20 with the SAUJ40X30-20
To replace the discontinued SUJ40X30-20, order the direct replacement SAUJ40X30-20, which retains the 40 mm bore, 30 mm nominal stroke, 1/4" port, M12x1.25 rod thread, and FA/LB mounting. Choose the -20 mm adjust window when you need on-site extend tuning between 10 and 30 mm; for fixed 30 mm strokes without tuning, a standard SAU cylinder is simpler. Because this specific SKU lacks a magnet, it cannot use sensors; if position detection is needed, select an SAUJ-S model and use current CMSG/DMSG/EMSG switches instead of the legacy CS1-B/DS1-B. Note that the adjustable stop sets end position and decelerates the load near stroke end via the 21 mm cushion, but it is not a lock—held loads require an external rod lock or pilot-operated check valve. For this 30 mm stroke, side-load concerns are minimal, but always verify rod alignment.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X30-20
- ✓ 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 SUJ40X30-20 FAQ
Yes, the AirTAC SUJ40X30-20 is discontinued. The direct replacement is the SAUJ40X30-20, which matches the 40 mm bore, 30 mm stroke, 1/4" port, and FA/LB mounting. The SAUJ uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches.
It is a double-acting double-rod cylinder with a 20 mm adjust window, allowing the 30 mm nominal extend stroke to be shortened to as little as 10 mm on-site. The external stop screw sets end position but is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X30-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X30-20 replacement — usually within 7-8 hours.