This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X400-20, 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 SUJ50X400-20
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X400-20 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 SAUJ50X400-20, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X400-20
- 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 SUJ50X400-20
The AirTAC SUJ50X400-20 is a double-acting, double-rod profile cylinder with a 50mm bore and 400mm nominal stroke, discontinued and replaced by the direct replacement SAUJ50X400-20. An external stop screw lets you trim the extend stroke by up to 20mm on-site, yielding a usable 380-400mm end position. The stop sets the end position and is not a load lock; plain cylinders drift on air loss. The 1/4" port and M16x1.5 rod end match the SAUJ exactly.
Because this SKU lacks a magnet (-S), it cannot take a switch. The SAUJ upgrade switches legacy CS1-B/DS1-B sensors to current CMSG/DMSG/EMSG switches while retaining the compact profile body and SC-series mounting.
Airtac SUJ Adjustable Cylinder SUJ50X400-20 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X400-20 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X400-20 |
| 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 SAUJ50X400-20 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 SAUJ50X400-20 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 SUJ50X400-20
| 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 SUJ50X400-20 Is Used
Custom End-Position Clamping
Trimming the extend stroke by 20mm on-site allows precise clamping of varying part thicknesses without repositioning the entire fixture.
Variable Length Diverter
A 380-400mm extend window lets operators fine-tune a diverter arm's reach on the fly to accommodate different package sizes on a packaging line.
Adjustable Depth Pusher
Pushing bins into a storage rack to a precise depth is simplified by the external stop screw, which sets the exact end position without PLC changes.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X400-20 with the SAUJ50X400-20
To replace this discontinued SUJ50X400-20, order the exact direct replacement SAUJ50X400-20 (same 50mm bore, 400mm stroke, 20mm adjust window, 1/4" port, and FA/LB mounting). Choose the -20mm adjust window if you need 380-400mm end positioning. Since this SKU has no magnet, it cannot accept sensors; the SAUJ requires CMSG/DMSG/EMSG switches instead of legacy CS1-B/DS1-B. For the 400mm stroke, use external guides to prevent rod bending and side-load wear. For load holding, add an external rod lock or pilot-operated check valve, as the adjust screw and air cushions only decelerate, never lock.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X400-20
- ✓ 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 SUJ50X400-20 FAQ
Yes, the SUJ50X400-20 is discontinued. The direct replacement is the SAUJ50X400-20, offering the same 50mm bore, 400mm stroke, 20mm 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 provides a 20mm adjust window, shortening the 400mm extend stroke down to 380mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X400-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ50X400-20 replacement — usually within 7-8 hours.