This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X300-20, 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 SUJ40X300-20
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X300-20 is a double-acting profile-type standard cylinder with a Ø40mm bore and 300mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X300-20, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X300-20
- 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 SUJ40X300-20
The AirTAC SUJ40X300-20 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 280-300 mm stroke. The nominal 300 mm is the maximum. This SUJ model is DISCONTINUED; the direct replacement is the SAUJ40X300-20, matching the bore, stroke, force, port, and FA/LB mounting.
The stop screw sets the end position but is not a load lock. For held loads, use an external rod lock. This SKU lacks a magnet, so it cannot take a switch. Upgrading to the SAUJ brings current CMSG/DMSG/EMSG sensors (this legacy used CS1-B/DS1-B).
Airtac SUJ Adjustable Cylinder SUJ40X300-20 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X300-20 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X300-20 |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAUJ40X300-20 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 SAUJ40X300-20 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 SUJ40X300-20
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SUJ40X300-20 Is Used
Variable Pitch Pushing
Tuning the extend stroke by up to 20 mm on-site allows a single 300 mm cylinder to push parts at slightly different lengths without changing the entire actuator setup.
Inline Diverter Timing
Adjusting the end position lets operators fine-tune how far a diverter arm extends over a moving belt, ensuring product clearance without repositioning the bracket.
Carton Flap Folding
The external stop screw provides a hard mechanical end position to consistently fold varying carton flap heights before taping, maintaining precise contact pressure.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X300-20 with the SAUJ40X300-20
To replace the discontinued SUJ40X300-20, order the direct replacement SAUJ40X300-20. The -20 adjust window means you can shorten the 300 mm extend stroke by up to 20 mm on-site. Mounting uses basic, FA, or LB brackets (AirTAC SC series compatible only). Because this SKU has no magnet, it cannot accept a sensor; the SAUJ upgrade supports CMSG/DMSG/EMSG switches. At 300 mm stroke, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X300-20
- ✓ 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 SUJ40X300-20 FAQ
Yes, the SUJ40X300-20 is discontinued. The SAUJ also uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B.
The external stop screw window is 20 mm, allowing you to trim the 300 mm extend stroke down to 280 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X300-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X300-20 replacement — usually within 7-8 hours.