This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X400-30, 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 SUJ50X400-30
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X400-30 is a double-acting profile-type standard cylinder with a Ø50mm bore and 400mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ50X400-30, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X400-30
- 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 SUJ50X400-30
The AirTAC SUJ50X400-30 is a double-acting double-rod profile cylinder with a 50mm bore and 400mm maximum extend stroke. An external stop screw lets you trim the extend stroke by up to 30mm on-site, giving a usable 370-400mm window to dial in exact end positions without mechanical shims.
The direct replacement is the SAUJ50X400-30, which matches the bore, stroke, force, port, and SC-series FA/LB mounting. Upgrading to the SAUJ moves you to current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches used here. As a non-magnet SKU, this cylinder cannot accept reed switches. The stop screw sets end position only; it is not a load lock, so add an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ50X400-30 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X400-30 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X400-30 |
| Bore size | Ø50 mm |
| Stroke | 400 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M16×1.5 |
| 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 SAUJ50X400-30 carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAUJ50X400-30 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 SUJ50X400-30
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 50 | 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 SUJ50X400-30 Is Used
Adjustable End-Stop Pressing
Dial in precise 370-400mm extend positions on-site for pressing tasks where material thickness varies, using the external stop screw to set the exact end point without reprogramming.
Variable-Length Ejection
Trim the extend stroke by up to 30mm to adapt a fixed ejection station to different product lengths without moving the cylinder mount.
Tunable Pallet Positioning
Set precise extend limits for pallet stops or diverters, allowing 30mm of mechanical adjustment to compensate for conveyor belt drift or pallet tolerance.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X400-30 with the SAUJ50X400-30
To replace this discontinued SUJ50X400-30, order the exact direct replacement SAUJ50X400-30. Choose the -30 adjust window if you need up to 30mm of field stroke tuning; remember the stop screw sets end position but is not a load lock. This non-magnet SKU cannot take sensors, but if you order an -S SAUJ, use current CMSG/DMSG/EMSG sensors instead of the old CS1-B/DS1-B. Mounting uses FA/LB brackets. Because the 400mm stroke is long, support the rod to prevent bending and use external guides to manage side loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X400-30
- ✓ 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 SUJ50X400-30 FAQ
Yes, the SUJ50X400-30 is discontinued. The direct replacement is the SAUJ50X400-30, matching the 50mm bore, 400mm stroke, 1/4" port, and FA/LB mounting. The SAUJ uses current CMSG/DMSG/EMSG sensors instead of the old CS1-B/DS1-B.
The 30mm adjust window lets you shorten the 400mm extend stroke to 370mm on-site. The stop screw sets end position but is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X400-30
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ50X400-30 replacement — usually within 7-8 hours.