This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X400-20S, 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 SUJ40X400-20S
The AirTAC SUJ Adjustable Cylinder SUJ40X400-20S is a double-acting profile-type standard cylinder with a Ø40mm bore and 400mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X400-20S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X400-20S
- 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 SUJ40X400-20S
The AirTAC SUJ40X400-20S is a double-acting double-rod profile cylinder with a 400 mm nominal stroke and a 20 mm external stop screw window, letting you trim the extend stroke down to 380 mm on-site. This discontinued adjustable-stroke unit is fully replaced by the direct replacement SAUJ40X400-20S, which retains the exact bore, stroke, force, and FA/LB mounting.
The SAUJ upgrade switches from legacy CS1-B/DS1-B sensors to current CMSG/DMSG/EMSG switches while keeping the compact profile barrel shorter than an ISO 15552 cylinder of the same bore. The stop screw sets the end position but is not a load lock; a plain cylinder drifts on air loss, so use an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ40X400-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X400-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X400-20S |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAUJ40X400-20S 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 SAUJ40X400-20S 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 SUJ40X400-20S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SUJ40X400-20S Is Used
Variable Stroke Clamping
Adjusts the extend stop on-site for clamping parts of slightly different heights without reprogramming the PLC.
Sorting Diverter Arms
Tunes the actuator reach precisely to divert varying package sizes on a moving conveyor line.
Packaging Pusher Setup
Dials in the exact push distance during machine commissioning to accommodate new carton dimensions.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X400-20S with the SAUJ40X400-20S
To replace the discontinued SUJ40X400-20S, order the direct replacement SAUJ40X400-20S, which matches the 40 mm bore, 400 mm nominal stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. The 20 mm adjust window is ideal if your extend stroke needs field tuning between 380 and 400 mm. Because this is an -S model, note the sensor change from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG switches. For this 400 mm long stroke, use external guides to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X400-20S
- ✓ 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 SUJ40X400-20S FAQ
Yes, the SUJ40X400-20S is discontinued. The direct replacement is the SAUJ40X400-20S, offering the same 40 mm bore, 400 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. You will only need to upgrade the switches from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG sensors.
The external stop screw provides a 20 mm adjust window, allowing you to shorten the 400 mm extend stroke down to 380 mm on-site. The stop sets end position only; it is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X400-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X400-20S replacement — usually within 7-8 hours.