The AirTAC AirTAC SDA40X20SH Compact Cylinder | 40mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø40mm bore and 20mm 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 SDA40X20SH is a double-acting, single-rod compact cylinder engineered to deliver 628.3 N of push force at 0.5 MPa. Its riveted assembly merges the barrel, rear cover, piston, and rod into a highly shortened unit, drastically reducing axial mounting depth where a conventional round-body actuator would be too bulky. The 40 mm bore houses a 16 mm piston rod, and this specific configuration includes an FKM fluororubber seal for heightened thermal and oil resistance.
Because this model carries the S option, a built-in piston magnet enables position detection via an AirTAC reed or electronic switch seated in the body grooves. End-stop deceleration relies on a fixed NBR bumper rather than an adjustable air cushion, meaning operators should slow the approach or mount an external shock absorber for high-energy cycles. Furthermore, the B option equips the rod end with a male M14x1.5 thread for secure load coupling.
| Model | AirTAC SDA40X20SH Compact Cylinder | 40mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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. |
| ×20 | 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 housings inside a CNC machining center, utilizing the 628.3 N push force to hold parts firmly against locators during high-speed milling.
Drives a short 20 mm stroke to tuck corrugated carton flaps on a continuous packaging line, where the compact riveted body saves valuable axial space.
Acts as a pneumatic stop pin in a pallet conveyor system, elevating to catch incoming workpieces while the FKM seals withstand elevated ambient heat.
When sizing this 40 mm bore actuator, compare its 628.3 N push at 0.5 MPa against adjacent options. Stepping down, the SDA32 provides 402.1 N; stepping up, the SDA50 yields 981.7 N. For this specific configuration, the safe working load is approximately 377 N (about 60% of the 0.5 MPa figure), translating to a vertical lift capacity of roughly 32 kg with a 2:1 safety margin.
Keep in mind that a standard compact body does not hold its position if air pressure drops or the valve is centered, as the piston will drift and the fixed bumper only decelerates near the stroke end. To lock a suspended load, integrate an external rod lock or a pilot-operated check valve. To order, confirm the 40 mm bore, 20 mm stroke, PT1/8 port, male M14x1.5 rod thread, FKM seals, and the built-in magnet.
Quick checklist
This double-acting 40 mm bore cylinder generates 628.3 N push and 527.8 N pull at 0.5 MPa, or 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum push is 128 kgf at 1.0 MPa. It operates between 0.15 and 1.0 MPa, with a proof pressure of 1.5 MPa, and runs at speeds of 30-500 mm/s.
It uses a fixed NBR bumper at each end to decelerate the piston, which is not an adjustable air cushion. For high-speed cycles, add an external shock absorber. Additionally, it will not hold a load if air is lost; the piston drifts, so an external rod lock or pilot-operated check valve is required for suspended loads.
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