The AirTAC AirTAC SDA40X25SH Compact Cylinder | 40mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø40mm bore and 25mm stroke, PT1/8 air ports and a riveted short body that saves mounting depth. Sensor slots around the body accept magnetic switches for position sensing.
The AirTAC SDA40X25SH is a double-acting single-rod compact cylinder engineered to deliver a push force of 628.3 N and a pull force of 527.8 N at 0.5 MPa. Its short riveted body significantly reduces axial mounting depth, making it ideal for machinery where a standard round-body unit would be too long. The bore is hard-anodized and utilizes a two-way piston seal for reliable operation.
This specific configuration includes a built-in piston magnet (-S) for use with AirTAC reed or electronic switches, and fluororubber (FKM) seals (-H) for enhanced thermal and oil resistance. End-stopping is handled by a fixed NBR bumper rather than an adjustable air cushion, meaning operators should slow the approach or add an external shock absorber for high-energy loads. The 16 mm piston rod features a female M8x1.25 thread, and the air supply connects via a PT1/8 port.
| Model | AirTAC SDA40X25SH Compact Cylinder | 40mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | PT1/8 |
| Rod end thread | M8×1.25 female / M14×1.5 male (B) |
| 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 – 500 mm/s |
| Cushion | Fixed NBR bumper (both ends) |
| Max standard stroke | Up to 120 mm |
Specifications follow the official AirTAC SDA compact-cylinder datasheet. Confirm against the product label before installation. Port thread: PT (standard). Rod: female thread (blank) / male thread (B).
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| SDA | Compact (thin) double-acting cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| B | Male-thread piston rod (omit = female-thread rod). |
Thread: PT standard. Related SDA-family variants: SSA (single-acting push), STA (single-acting pull), SDAD (double rod), SDAJ (adjustable stroke), SDAT (duplex), SDAW (duplex-end).
Secures aluminum workpieces in a CNC machining center, utilizing the 628.3 N extend force to hold parts firmly against locators during high-speed milling.
Drives the mechanical arms that fold corrugated box flaps prior to sealing, where the shortened body depth prevents interference with adjacent conveyor guides.
Pushes small plastic parts out of an injection molding tool cavity, leveraging the 25 mm stroke and FKM seals to withstand ambient machine heat.
When sizing this actuator, consider stepping down to the SDA32, which provides 402.1 N of push force at 0.5 MPa, or moving up to the SDA50, which yields 981.7 N at the same pressure. For this 40 mm bore, the safe working load is approximately 377 N (about 60% of the 0.5 MPa push figure), translating to a vertical lift capacity of roughly 32 kg with a 2:1 safety margin. Keep in mind that a plain compact cylinder does not hold its position if air pressure is lost or the valve is centered; the piston will drift, and the fixed bumper only decelerates near the stroke end. For load holding, an external rod lock or pilot-operated check valve is required. To order, confirm the 40 mm bore, 25 mm stroke, PT1/8 port, S magnet, female rod thread, and FKM seal option.
Quick checklist
At 0.5 MPa, the push force is 628.3 N and the pull force is 527.8 N. At 0.7 MPa, the push force is 879.6 N and the pull force is 738.9 N. The theoretical maximum push force is 128 kgf at the maximum operating pressure of 1.0 MPa.
No, the piston will drift if air pressure is lost or the directional valve is centered. The fixed NBR bumper only decelerates the piston near the stroke end and does not act as a lock or brake. To maintain a vertical load without live pressure, you must install an external rod lock or a pilot-operated check valve.
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