This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is SAUD40X250S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the SAUD40X250S 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 SUD40X250S
The AirTAC Airtac SUD Series Double Rod Cylinder SUD40X250S is a double-acting profile-type standard cylinder with a Ø40mm bore and 250mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the SAUD40X250S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke250 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUD40X250S
About the Airtac SUD Series Double Rod Cylinder SUD40X250S
The AirTAC SUD40X250S is a discontinued double-acting double-rod profile cylinder featuring a 40mm bore, 250mm stroke, and a 1/4 inch port. A rod exits both ends on one piston, meaning both faces use the rod-side area and push and pull force are equal at 528N @0.5 MPa, 739N @0.7 MPa, and 950N @0.9 MPa. This model is end-of-life and the exact drop-in replacement is the SAUD40X250S, which shares the same bore, stroke, force, port, and SC-series FA/LB mounting.
Because the second rod can carry a sensor cam or drive two tools simultaneously, it provides excellent anti-rotation stability. The extruded aluminium profile barrel is shorter than an ISO 15552 cylinder of the same bore. From the 528N @0.5 MPa figure, the computed safe working load is ~317N, yielding a vertical lift capacity of ~27kg with a 2:1 margin. This -S variant has a built-in piston magnet for legacy CS1-B/DS1-B switches; the SAUD replacement uses current CMSG/DMSG/EMSG sensors.
Airtac SUD Series Double Rod Cylinder SUD40X250S Technical Specifications
| Model | Airtac SUD Series Double Rod Cylinder SUD40X250S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUD40X250S |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| 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 SAUD40X250S carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAUD40X250S 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 SUD40X250S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SUD40X250S Is Used
Dual-Tool Synchronous Drive
Drives two opposing tools simultaneously from one piston, utilising the equal push and pull force of the 40mm bore for balanced machining or clamping operations.
Anti-Rotation Transfer Arm
The twin rods prevent mechanical rotation during part transfer across a conveyor, maintaining precise alignment without needing external guide rails.
Symmetric Push-Pull Sorting
Handles symmetric sorting gates where identical force is required in both directions to divert packages evenly on a packaging line.
Replacing the Airtac SUD Series Double Rod Cylinder SUD40X250S with the SAUD40X250S
To replace this discontinued SUD40X250S, order the SAUD40X250S drop-in (same 40mm bore, 250mm stroke, 528N equal-both-ways force, 1/4 inch port, and FA/LB mounting). When sizing both ways, verify the 528N @0.5 MPa output fits your load, or step to neighbouring bores (32mm or 50mm) for different equal forces. Choose a double-rod design when you need anti-rotation stability or must drive two tools from one cylinder. For the -S sensor change, swap legacy CS1-B/DS1-B switches for CMSG/DMSG/EMSG sensors on the SAUD. At 250mm stroke, ensure your side-load moments stay within the profile barrel limits. A plain cylinder does not hold loads on air loss; add an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAUD40X250S
- ✓ 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 SUD40X250S FAQ
Yes, the SUD40X250S is discontinued. The exact drop-in replacement is the SAUD40X250S, offering the same 40mm bore, 250mm stroke, equal force, 1/4 inch port, and FA/LB mounting. You only need to upgrade the sensors from CS1-B/DS1-B to CMSG/DMSG/EMSG.
The SUD40X250S provides equal force both ways: 528N @0.5 MPa, 739N @0.7 MPa, and 950N @0.9 MPa. It uses a 1/4 inch port, has a 16mm rod, and the air cushion only decelerates near stroke end rather than holding the load.
Related AirTAC SAU Cylinders
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