This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is SAUD50X255S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the SAUD50X255S in place of this model. 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 SUD50X255S
The AirTAC Airtac SUD Series Double Rod Cylinder SUD50X255S is a double-acting profile-type standard cylinder with a Ø50mm bore and 255mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the SAUD50X255S, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke255 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAUD50X255S
About the Airtac SUD Series Double Rod Cylinder SUD50X255S
The AirTAC SUD50X255S is a double-acting double-rod profile cylinder featuring a 50mm bore and 255mm stroke. A rod exits both ends on a single piston, meaning push and pull force are equal both ways at 825N @0.5MPa, 1154N @0.7MPa, and 1484N @0.9MPa. This SUD model is discontinued and the exact drop-in replacement is the SAUD50X255S, retaining the same 1/4" port, M16x1.5 rod thread, and 21mm adjustable cushions. The extruded aluminum profile barrel is shorter than an ISO 15552 cylinder of the same bore.
The rear rod provides an anti-rotation benefit and carries a sensor cam for stable mounting. With a magnet present (-S), this unit used legacy CS1-B/DS1-B switches, whereas the SAUD replacement uses current CMSG/DMSG/EMSG sensors. For sizing, the safe working load is roughly 495N (60% of the 825N @0.5MPa figure), allowing a vertical lift of about 42kg with a 2:1 margin. Note that air cushions only decelerate near stroke end; an external rod lock is required for load holding.
Airtac SUD Series Double Rod Cylinder SUD50X255S Technical Specifications
| Model | Airtac SUD Series Double Rod Cylinder SUD50X255S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUD50X255S |
| Bore size | Ø50 mm |
| Stroke | 255 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 SAUD50X255S 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 SAUD50X255S produces the same force from the same bore — a true drop-in on output. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SUD Series Double Rod Cylinder SUD50X255S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×255 | 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 SUD50X255S Is Used
Dual-Tool Machining Station
Drives two opposing tools simultaneously from a single compact profile body, utilizing the equal both ways force to ensure consistent machining pressure on both ends.
Anti-Rotation Lift Mechanism
The dual-rod construction prevents piston rotation during vertical lifting, providing precise guidance for payloads up to the 42kg vertical lift capacity.
Symmetrical Transfer Unit
Pushes and pulls a workpiece across a conveyor with identical 825N force at 0.5MPa in both directions, ensuring stable transfer without momentum shifts.
Replacing the Airtac SUD Series Double Rod Cylinder SUD50X255S with the SAUD50X255S
To replace the discontinued SUD50X255S, drop in the SAUD50X255S which matches the 50mm bore, 255mm stroke, equal-both-ways force, 1/4" port, and FA/LB mounting. When sizing both ways, consider neighbour bores (40mm or 63mm) to meet your force requirements, keeping in mind the 50mm delivers 825N @0.5MPa equally in both directions. A double rod is right when you need anti-rotation stability or need to drive two tools simultaneously. If your stroke is 300mm or greater, carefully verify the side-load line to prevent guide wear. For the -S sensor variant, upgrade from legacy CS1-B/DS1-B to CMSG/DMSG/EMSG sensors. Remember, a plain cylinder does not hold loads on air loss; use an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAUD50X255S
- ✓ 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 SUD50X255S FAQ
Yes, the SUD50X255S is discontinued. The exact drop-in replacement is the SAUD50X255S, which shares the same 50mm bore, 255mm stroke, equal-both-ways force, 1/4" port, and FA/LB mounting. You only need to upgrade the sensors from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG.
Because it is a double-rod cylinder, the force is equal both ways: 825N @0.5MPa, 1154N @0.7MPa, and 1484N @0.9MPa. The air port is 1/4" PT thread, the rod is Ø20mm with an M16x1.5 thread, and it includes 21mm adjustable cushions at each end.
Related AirTAC SAU Cylinders
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