This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X50-30STC, 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 SUJ40X50-30STC
The AirTAC SUJ Adjustable Cylinder SUJ40X50-30STC 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 SAUJ40X50-30STC, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X50-30STC
- 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 SUJ40X50-30STC
The AirTAC SUJ40X50-30STC is a double-acting double-rod profile cylinder with an external stop screw that lets you trim the extend stroke by up to 30 mm on-site, yielding a usable 20-50 mm extend out of the 50 mm nominal maximum. It features a 1/4" port, an M12x1.25 rod thread, and 21 mm adjustable air cushions at each end. This discontinued unit is fully replaced by the SAUJ40X50-30STC.
The direct replacement SAUJ40X50-30STC shares the exact bore, stroke, force, port, and TC mounting interface, but upgrades sensing from legacy CS1-B/DS1-B switches to current CMSG/DMSG/EMSG sensors. Remember the stop screw sets the end position; it is not a load lock, so an external rod lock is required to hold loads on air loss.
Airtac SUJ Adjustable Cylinder SUJ40X50-30STC Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X50-30STC |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X50-30STC |
| 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 SAUJ40X50-30STC 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 SAUJ40X50-30STC 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 SUJ40X50-30STC
| 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 SUJ40X50-30STC Is Used
Custom Clamping Depth
Ideal for varying material thicknesses where the extend stroke must be fine-tuned on the fly to apply precise clamping force without repositioning the cylinder.
Variable Stroke Ejection
Perfect for ejecting parts of different heights from a fixture, allowing operators to trim the extend stroke by up to 30 mm on-site for safe part clearance.
Adjustable Forming Stops
Used in light press operations where the exact end-of-stroke position must be dialed in manually to accommodate different bending or forming depths.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X50-30STC with the SAUJ40X50-30STC
To replace the discontinued SUJ40X50-30STC, specify the SAUJ40X50-30STC direct, retaining the 40 mm bore, 50 mm nominal stroke, 1/4" port, and TC mounting. The 30 mm adjust window is ideal when you need precise field tuning of the extend stroke (20-50 mm) without machining external stops. Because this unit carries the -S magnet, swap legacy CS1-B/DS1-B switches for CMSG/DMSG/EMSG sensors. For strokes of 300 mm or longer, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X50-30STC
- ✓ 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 SUJ40X50-30STC FAQ
Yes, the SUJ40X50-30STC is discontinued. The direct replacement is the SAUJ40X50-30STC, which matches the 40 mm bore, 50 mm stroke, 1/4" port, and TC mounting. You must upgrade the piston magnet sensors from legacy CS1-B/DS1-B to the current CMSG/DMSG/EMSG series.
The external stop screw provides a 30 mm adjust window, allowing the 50 mm nominal extend stroke to be shortened to as little as 20 mm on-site. The stop sets end position only; it is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X50-30STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X50-30STC replacement — usually within 7-8 hours.