This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X50-20STC, 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 SUJ40X50-20STC
The AirTAC SUJ Adjustable Cylinder SUJ40X50-20STC is a double-acting profile-type standard cylinder with a Ø40mm bore and 50mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X50-20STC, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X50-20STC
- 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 SUJ40X50-20STC
The AirTAC SUJ40X50-20STC 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. With a 50 mm nominal stroke, the usable extend range is 30-50 mm. The stop sets the end position but is not a load lock. The extruded aluminum profile barrel is shorter than an ISO 15552 cylinder of the same bore.
This SUJ model is discontinued and the direct replacement is the SAUJ40X50-20STC, retaining the same bore, stroke, adjust window, force, and FA/LB mounting. Upgrading to the SAUJ moves you to current CMSG/DMSG/EMSG sensors from the legacy CS1-B/DS1-B switches.
Airtac SUJ Adjustable Cylinder SUJ40X50-20STC Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X50-20STC |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X50-20STC |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAUJ40X50-20STC 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 SAUJ40X50-20STC 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 SUJ40X50-20STC
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SUJ40X50-20STC Is Used
Variable Pitch Indexing
Dialing the extend stop down from 50 mm allows precise part ejection on the fly without reprogramming a fixed cylinder.
Adjustable Divert Stroke
Trimming the extend stroke by up to 20 mm accommodates changing package widths on a sorting line directly at the machine.
Crush-Sensitive Sealing
The external stop sets the exact end position for delicate film sealing jaws, preventing mechanical overrides.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X50-20STC with the SAUJ40X50-20STC
To replace the discontinued SUJ40X50-20STC, order the direct replacement SAUJ40X50-20STC. Choose the 20 mm adjust window when you need on-site extend trimming between 30 and 50 mm. The TC mounting interface uses SC-series accessories. Because this unit has the -S magnet, you must switch from legacy CS1-B/DS1-B sensors to current CMSG/DMSG/EMSG switches on the SAUJ. A plain cylinder does not hold loads on air loss; use an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X50-20STC
- ✓ 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 SUJ40X50-20STC FAQ
Yes, the SUJ40X50-20STC is discontinued. The direct replacement is the SAUJ40X50-20STC, which matches the 40 mm bore, 50 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounting. You will need to upgrade the -S magnet sensors from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG.
The theoretical max is 128 kgf at 1.0 MPa. The 50 mm nominal extend stroke can be shortened on-site by up to 20 mm via the external stop screw, yielding a 30-50 mm usable range. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X50-20STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X50-20STC replacement — usually within 7-8 hours.