This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUD50X400, 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 SUD Series Double Rod Cylinder SUD50X400
The AirTAC Airtac SUD Series Double Rod Cylinder SUD50X400 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 SAUD50X400, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUD50X400
- 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 SUD Series Double Rod Cylinder SUD50X400
The AirTAC SUD50X400 is a double-acting, double-rod profile cylinder featuring a 50mm bore and 400mm stroke. A piston rod exits both ends, meaning push and pull forces are equal both ways at 825N @0.5MPa, 1154N @0.7MPa, and 1484N @0.9MPa. This model is DISCONTINUED. The direct replacement is the SAUD50X400, which matches the 1/4" port, M16x1.5 rod thread, and FA/LB mounting.
Because two rods drive the load, anti-rotation stability improves and the back rod can carry a sensor cam. Without a -S suffix, this SKU lacks a magnet and cannot take a switch. Note that air cushions only decelerate near stroke end; an external rod lock is required for load holding.
Airtac SUD Series Double Rod Cylinder SUD50X400 Technical Specifications
| Model | Airtac SUD Series Double Rod Cylinder SUD50X400 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUD50X400 |
| 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 SAUD50X400 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 SAUD50X400 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SUD Series Double Rod Cylinder SUD50X400
| 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 SUD Series Double Rod Cylinder SUD50X400 Is Used
Dual-Tool Transfer
Drives two opposing grippers simultaneously using both rod ends, ensuring perfectly synchronized part transfer without adding a second cylinder.
Anti-Rotation Lift
The twin-rod geometry prevents the piston from twisting during vertical elevation, ideal for raising heavy precision jigs that lack external linear guides.
Symmetric Pusher
Pushes a workpiece forward while retracting a return actuator on the back rod end, keeping automated conveyor pacing compact and mechanically linked.
Replacing the Airtac SUD Series Double Rod Cylinder SUD50X400 with the SAUD50X400
To replace the discontinued SUD50X400, order the SAUD50X400 direct (insert an A after the leading S). If sizing both ways, verify the 825N @0.5MPa equal force fits your load, or step to neighbouring bores (63mm or 40mm) for more or less power. Choose a double-rod cylinder when you need anti-rotation stability or to drive two tools simultaneously. Mounting is limited to Basic, FA, and LB (SC-series compatible only). For the 400mm stroke, use external guides to prevent rod bending under side-load. Because this non-magnetic SKU cannot take sensors, an upgrade to the SAUD with CMSG/DMSG/EMSG sensors requires specifying the -S option.
Replacement checklist
- ✓ Same bore / stroke → SAUD50X400
- ✓ 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 SUD Series Double Rod Cylinder SUD50X400 FAQ
Yes, the SUD50X400 is discontinued. The direct replacement is the SAUD50X400, which shares the same 50mm bore, 400mm stroke, 1/4" port, and FA/LB mounting. The SAUD uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches.
Because it is a double-rod cylinder, force is equal both ways: 825N @0.5MPa, 1154N @0.7MPa, and 1484N @0.9MPa. It operates at 30-800 mm/s, has a 1/4" port, and features 21mm adjustable air cushions at each end.
Related AirTAC SAU Cylinders
Request a Quote for the SAUD50X400
Send us the quantity and destination. We confirm price, stock and lead time on the SAUD50X400 replacement — usually within 7-8 hours.