The AirTAC AirTAC SDA40X20BH 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 SDA40X20BH is a double-acting single-rod compact cylinder engineered for tight machinery footprints. Its riveted assembly merges the barrel, rear cover, piston, and rod to minimize axial length, yielding a robust 628.3 N push force at 0.5 MPa. This specific SKU includes a male M14x1.5 piston rod end for secure mechanical load coupling and an FKM fluororubber seal for enhanced thermal and oil resistance.
Instead of an adjustable air cushion, the bore relies on a fixed NBR bumper at each end to decelerate the stroke. Without a piston magnet, this configuration cannot host magnetic switches; adding an -S variant enables reed or electronic switch integration. Operating between 0.15-1.0 MPa, the hard-anodized 40 mm bore pairs a 16 mm rod with PT1/8 ports to achieve a 30-500 mm/s speed range.
| Model | AirTAC SDA40X20BH 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 workpieces in CNC machining centers using the 628.3 N extend force, while the male M14x1.5 thread ensures a rigid tooling interface.
Drives folding mechanisms on automated packaging lines where the short riveted body saves axial depth and FKM seals withstand lubricated environments.
Actuates routing gates on parcel conveyors, offering a safe working load of 377 N to push packages reliably at cycle speeds up to 500 mm/s.
When sizing this 40 mm bore, stepping down to the SDA32 yields 402.1 N of push at 0.5 MPa, while stepping up to the SDA50 provides 981.7 N. For this 628.3 N output, a safe working load is roughly 377 N (about 60% capacity), translating to a vertical lift of approximately 32 kg with a 2:1 safety margin. Confirm your ordering essentials: 40 mm bore, 20 mm stroke, PT1/8 port, male M14x1.5 rod thread, FKM seals, and no sensor magnet.
Because this is a standard double-acting cylinder, it will not hold a load if air pressure drops or the valve is centered—the piston drifts, and the fixed bumper only decelerates near the stroke end. To maintain position vertically or under load without live pressure, you must integrate an external rod lock or a pilot-operated check valve.
Quick checklist
This 40 mm bore double-acting 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 force is 128 kgf at 1.0 MPa, with a proof pressure of 1.5 MPa.
No. The piston drifts if air is lost, as the fixed NBR bumper only decelerates the stroke end and acts as neither a lock nor a brake. For vertical load holding, use an external rod lock or pilot-operated check valve, and add external shock absorbers for high-energy impacts.
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