This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X40-20S, 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 SUJ40X40-20S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X40-20S is a double-acting profile-type standard cylinder with a Ø40mm bore and 40mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X40-20S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke40 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X40-20S
- 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 SUJ40X40-20S
The AirTAC SUJ40X40-20S is a 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 20-40 mm stroke from the 40 mm nominal maximum. The adjustable cushion provides 21 mm of deceleration at each end. This SUJ model is discontinued and is fully replaced by the direct replacement SAUJ40X40-20S, which retains the exact bore, stroke, force, port, and FA/LB mounting.
The stop screw sets the end position but is not a load lock; an external rod lock or pilot-operated check valve is required to hold loads on air loss. Because this unit has the -S suffix, it includes a piston magnet for legacy CS1-B/DS1-B switches, whereas the SAUJ replacement upgrades to current CMSG/DMSG/EMSG sensors. The compact profile barrel is shorter than an ISO 15552 cylinder of the same bore, making it ideal for tight machinery.
Airtac SUJ Adjustable Cylinder SUJ40X40-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X40-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X40-20S |
| Bore size | Ø40 mm |
| Stroke | 40 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 SAUJ40X40-20S 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 SAUJ40X40-20S 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 SUJ40X40-20S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 SUJ40X40-20S Is Used
Diverter Gate Positioning
Trimming the extend stroke by up to 20 mm on-site allows precise alignment of diverter gates without machining custom spacers.
Variable Length Product Stopping
Adjustable end positioning lets operators fine-tune the stopper location on a conveyor to handle varying package dimensions.
Compact Clamping Fixtures
The short profile barrel and field-tunable 20-40 mm stroke provide space-saving clamping where exact material thickness varies.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X40-20S with the SAUJ40X40-20S
To replace the discontinued SUJ40X40-20S, use the exact direct replacement SAUJ40X40-20S, which matches the 40 mm bore, 40 mm nominal stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. Choose the 20 mm adjust window when you need precise on-site end-position tuning between 20 and 40 mm. For the -S magnet option, note that the SAUJ uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches. For stroke lengths of 300 mm or greater, carefully verify side-load limits to prevent guide wear. Mounting compatibility is strictly with the AirTAC SC series.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X40-20S
- ✓ 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 SUJ40X40-20S FAQ
Yes, the SUJ40X40-20S is discontinued. The direct replacement is the SAUJ40X40-20S, which matches the 40 mm bore, 40 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. The SAUJ also offers the SAUF built-in-valve variant the SU line lacked.
The 20 mm adjust window allows trimming the extend stroke from the 40 mm nominal maximum down to 20 mm on-site. The stop screw sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X40-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X40-20S replacement — usually within 7-8 hours.