This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ50X400-20S, 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 SUJ50X400-20S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ50X400-20S 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 SAUJ50X400-20S, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUJ50X400-20S
- 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 SUJ50X400-20S
The AirTAC SUJ50X400-20S 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 380-400 mm extension out of the 400 mm nominal maximum. This unit features a 1/4" port, a 20 mm piston rod, and a built-in magnet for position sensing. The stop screw sets the end position but is not a load lock; plain cylinders drift on air loss, so use an external rod lock for held loads.
This discontinued SUJ model is replaced direct by the SAUJ50X400-20S, retaining the exact bore, stroke, force, 1/4" port, and FA/LB mounting. The SAUJ upgrade shifts sensing from legacy CS1-B/DS1-B switches to current CMSG/DMSG/EMSG sensors and offers the SAUF built-in-valve variant. At 400 mm stroke, external guides are recommended to prevent rod bending under side loads.
Airtac SUJ Adjustable Cylinder SUJ50X400-20S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ50X400-20S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ50X400-20S |
| 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 SAUJ50X400-20S 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 SAUJ50X400-20S 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 SUJ50X400-20S
| 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 SUJ50X400-20S Is Used
Variable Pitch Indexing
Trimming the 400 mm extend stroke by up to 20 mm on-site allows a packaging line to alter product pitch between 380 mm and 400 mm without swapping cylinders.
Adjustable Reject Pusher
A 50 mm bore profile cylinder pushing with 982 N at 0.5 MPa can tune its extend stop in the field to deflect varying carton widths off a conveyor belt.
Variable Height Diverter
Using the external stop screw to set exact 380-400 mm extend endpoints accommodates different pallet heights in a diverter gate without requiring mechanical shims.
Replacing the Airtac SUJ Adjustable Cylinder SUJ50X400-20S with the SAUJ50X400-20S
To replace the discontinued SUJ50X400-20S, order the direct replacement SAUJ50X400-20S, matching the 50 mm bore, 400 mm stroke, 20 mm adjust window, 1/4" port, and FA/LB mounts. Select the 20 mm adjust window if you need precise 380-400 mm field tuning; for fixed endpoints, a standard SAU cylinder suffices. Because the -S suffix denotes a magnet, swap legacy CS1-B/DS1-B sensors for CMSG/DMSG/EMSG switches on the SAUJ. At 400 mm stroke, add external guides to mitigate rod bending and side-load stress.
Replacement checklist
- ✓ Same bore / stroke → SAUJ50X400-20S
- ✓ 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 SUJ50X400-20S FAQ
Yes, the SUJ50X400-20S is discontinued. The direct replacement is the SAUJ50X400-20S, which matches the 50 mm bore, 400 mm stroke, 20 mm 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 50 mm bore double-rod cylinder pushes 982 N at 0.5 MPa, 1374 N at 0.7 MPa, and 1767 N at 0.9 MPa, with 825 N pull at 0.5 MPa and a 200 kgf max. The external stop screw provides a 20 mm adjust window, allowing the 400 mm extend stroke to be shortened to 380 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ50X400-20S
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