This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is SAUD40X125S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the SAUD40X125S 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 SUD40X125S
The AirTAC Airtac SUD Series Double Rod Cylinder SUD40X125S is a double-acting profile-type standard cylinder with a Ø40mm bore and 125mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the SAUD40X125S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUD40X125S
About the Airtac SUD Series Double Rod Cylinder SUD40X125S
The AirTAC SUD40X125S is a double-acting, double-rod profile cylinder featuring a 40mm bore and 125mm stroke. 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 @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. This model is discontinued; the exact drop-in replacement is the SAUD40X125S, which matches the 1/4 inch port, M12x1.25 rod thread, and FA/LB mounting.
Because the rear rod can carry a sensor cam or drive a second tool simultaneously, the design prevents rotation without external guides. The extruded aluminium profile barrel is shorter than an ISO 15552 cylinder of the same bore. For sizing, the safe working load is roughly 317N (60% of the 528N @0.5MPa figure), yielding a vertical lift capacity of about 27kg with a 2:1 margin. Note that the air cushion only decelerates near stroke end; an external rod lock is required for load holding.
Airtac SUD Series Double Rod Cylinder SUD40X125S Technical Specifications
| Model | Airtac SUD Series Double Rod Cylinder SUD40X125S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUD40X125S |
| Bore size | Ø40 mm |
| Stroke | 125 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 SAUD40X125S 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 SAUD40X125S 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 SUD40X125S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SUD40X125S Is Used
Dual-Station Machining
Drives two opposing workstations simultaneously from a single piston, utilizing the equal both ways force to push and pull identical tooling operations.
Anti-Rotation Transfer
Transfers parts across a belt using the twin rods to resist torsional twisting without needing external linear guides, ensuring smooth horizontal placement.
Symmetric Clamping
Centres and clamps delicate components from both sides evenly, using the rod-side area on both faces to apply identical 528N @0.5MPa clamping pressure.
Replacing the Airtac SUD Series Double Rod Cylinder SUD40X125S with the SAUD40X125S
To replace the discontinued SUD40X125S, use the SAUD40X125S drop-in, matching the 40mm bore, 125mm stroke, and 1/4 inch port. When sizing both ways, verify the equal push/pull force of 528N @0.5MPa against your load, or step to neighbouring bores (32mm or 50mm) if margins are tight. Choose a double-rod cylinder when anti-rotation or synchronous dual-tool driving is required. Mounting is limited to Basic, FA, and LB (SC-series compatible only). Because this unit has the -S magnet, upgrade sensing from legacy CS1-B/DS1-B switches to current CMSG/DMSG/EMSG sensors. For stroke lengths of 300mm or greater, carefully manage side-load moments to prevent premature seal wear.
Replacement checklist
- ✓ Same bore / stroke → SAUD40X125S
- ✓ 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 SUD40X125S FAQ
Yes, the SUD40X125S is discontinued. The exact drop-in replacement is the SAUD40X125S, which offers the same 40mm bore, 125mm stroke, equal both ways force, 1/4 inch port, and FA/LB mounting. You must upgrade the sensors from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG switches.
The double-rod design yields equal push and pull force both ways: 528N @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. It operates at 30-800mm/s, features a 1/4 inch port, M12x1.25 rod thread, and 21mm adjustable air cushions at each end.
Related AirTAC SAU Cylinders
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