This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X20-20S, 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 SUJ40X20-20S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X20-20S is a double-acting profile-type standard cylinder with a Ø40mm bore and 20mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X20-20S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke20 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X20-20S
- 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 SUJ40X20-20S
The AirTAC SUJ40X20-20S is a double-acting double-rod profile cylinder with a 40 mm bore and 20 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 0-20 mm extend window for precise in-field positioning. The extruded aluminum profile barrel is more compact than an ISO 15552 unit of the same bore.
This SUJ series is discontinued; the direct replacement is the SAUJ40X20-20S, retaining the bore, stroke, force, port, and FA/LB mounting. The SAUJ upgrades to current CMSG/DMSG/EMSG sensors, whereas this legacy unit uses CS1-B/DS1-B switches. Note that the stop screw sets the end position but is not a load lock; an external rod lock is required to hold loads on air loss.
Airtac SUJ Adjustable Cylinder SUJ40X20-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X20-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X20-20S |
| Bore size | Ø40 mm |
| Stroke | 20 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 SAUJ40X20-20S 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 SAUJ40X20-20S 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 SUJ40X20-20S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 SUJ40X20-20S Is Used
Gauge Positioning Stops
Trimming the extend stroke by up to 20 mm on-site allows operators to set exact contact points for variable-length part gauging without machining custom spacers.
Short-Stroke Clamping
Ideal for clamping delicate components where the 0-20 mm usable extend window provides incremental adjustment to avoid crushing parts of slightly varying heights.
Actuator Length Tuning
Field-tuning the extend end position simplifies the setup of multi-stage pick-and-place mechanisms, replacing the need to physically swap cylinders for minor length differences.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X20-20S with the SAUJ40X20-20S
To replace the discontinued SUJ40X20-20S, order the direct replacement SAUJ40X20-20S, which matches the 40 mm bore, 20 mm nominal stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. Choose the 20 mm adjust window if your fixture needs to trim the extend stroke by up to 20 mm on-site without adding an external stop. Because this model has the -S magnet, you must migrate from legacy CS1-B/DS1-B switches to current CMSG/DMSG/EMSG sensors. The stop screw sets end position and does not lock the load; use an external rod lock for held loads. For strokes >=300 mm, verify side-load tolerance to prevent guide wear.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X20-20S
- ✓ 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 SUJ40X20-20S FAQ
Yes, the SUJ40X20-20S is discontinued. The direct replacement is the SAUJ40X20-20S, which matches the 40 mm bore, 20 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. The SAUJ uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches.
The external stop screw allows you to trim the extend stroke by up to 20 mm on-site, giving a usable 0-20 mm window from the 20 mm nominal maximum. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X20-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X20-20S replacement — usually within 7-8 hours.