This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUD50X400S, 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 SUD50X400S
The AirTAC Airtac SUD Series Double Rod Cylinder SUD50X400S 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 SAUD50X400S, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUD50X400S
- 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 SUD50X400S
The AirTAC SUD50X400S is a double-acting, double-rod profile cylinder featuring a 50mm bore, 400mm stroke, and a 1/4 inch air port. Because a rod exits both ends on one piston, both faces use the rod-side area, making push and pull force equal both ways (825 N at 0.5 MPa). The extruded aluminum profile barrel is shorter than an ISO 15552 cylinder of the same bore. This SUD50X400S model is discontinued and the direct replacement is the SAUD50X400S, which shares the same body, bore, stroke, force, port, and FA/LB mounting.
With a 400mm stroke, external guides are recommended to prevent rod bending under side loads. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches; the SAUD replacement uses current CMSG/DMSG/EMSG sensors. The double-rod design provides anti-rotation stability and allows the back rod to carry a sensor cam.
Airtac SUD Series Double Rod Cylinder SUD50X400S Technical Specifications
| Model | Airtac SUD Series Double Rod Cylinder SUD50X400S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUD50X400S |
| 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 SAUD50X400S 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 SAUD50X400S 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 SUD50X400S
| 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 SUD50X400S Is Used
Dual-Tool Machining Station
Drives two opposing machining heads simultaneously, utilizing the equal both ways force to ensure perfectly synchronized cutting cycles without requiring separate actuators.
Anti-Rotation Transfer Gate
Uses the twin-rod geometry to prevent mechanical twisting during high-speed part diversion on a conveyor line, maintaining precise alignment without external linear bearings.
Replacing the Airtac SUD Series Double Rod Cylinder SUD50X400S with the SAUD50X400S
To replace the discontinued SUD50X400S, specify the SAUD50X400S as a direct solution, retaining the 50mm bore, 400mm stroke, 1/4 inch port, and FA/LB mounting. When sizing both ways, verify the equal-both-ways force fits your needs: the 50mm bore yields 825 N at 0.5 MPa, while the neighboring 40mm bore yields 528 N and the 63mm yields 1402 N. A double rod is right when you need anti-rotation stability or want to drive two tools from one cylinder. For the -S sensor change, swap legacy CS1-B/DS1-B switches for current CMSG/DMSG/EMSG sensors. Because the stroke is 400mm (>=300), add external guides to manage side-load and rod-bending.
Replacement checklist
- ✓ Same bore / stroke → SAUD50X400S
- ✓ 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 SUD50X400S FAQ
Yes, the SUD50X400S is discontinued. The direct replacement is the SAUD50X400S, which matches the 50mm bore, 400mm stroke, 1/4 inch port, and FA/LB mounting. You only need to upgrade the -S magnet sensors from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG.
Force is equal both ways: 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at 0.9 MPa. The air cushion only decelerates near stroke end; it does not hold loads on air loss. For vertical holding, install an external rod lock or pilot-operated check valve.
Related AirTAC SAU Cylinders
Request a Quote for the SAUD50X400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUD50X400S replacement — usually within 7-8 hours.