The AirTAC AirTAC SDA40X20SB 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 SDA40X20SB is a double-acting, single-rod compact cylinder engineered to deliver 628.3 N of push force at 0.5 MPa. Its riveted assembly keeps axial length exceptionally short, saving valuable mounting depth in tight machine layouts where a conventional round-body unit would not fit. The bore is hard-anodized and utilizes a two-way piston seal for reliable performance across a 30-500 mm/s speed range.
This specific configuration includes the -S option for a built-in piston magnet, allowing integration with AirTAC reed or electronic switches via the body grooves, and the -B option, which provides a male M14x1.5 threaded rod end for secure mechanical coupling. End-of-travel deceleration is handled by a fixed NBR bumper rather than an adjustable cushion, meaning operators should slow the approach or add an external shock absorber for high-energy loads.
| Model | AirTAC SDA40X20SB 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 engine blocks during machining operations, utilizing the 628.3 N extend force and male M14x1.5 rod to lock heavy castings firmly against the fixture locators.
Drives mechanical folding arms on a high-speed packaging line to tuck corrugated box flaps prior to sealing, where the short 20 mm stroke and compact body depth prevent interference with adjacent conveyor guides.
Pushes formed sheet metal parts out of a progressive die, relying on the hard-anodized bore and fixed NBR bumpers to withstand rapid 30-500 mm/s cycling without requiring an adjustable air cushion.
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, letting you fine-tune the footprint to your actual force needs. Based on the 628.3 N push figure, a safe working load is roughly 377 N (about 60% capacity), translating to a vertical lift capability of approximately 32 kg with a 2:1 safety margin. To confirm your ordering essentials for this model: specify the 40 mm bore, 20 mm stroke, PT1/8 port, required -S magnet, and -B male-thread rod. Remember that a plain compact cylinder drifts if air pressure is lost or the valve is centered; the fixed NBR bumper only decelerates near the stroke end and acts as neither a lock nor a brake, so incorporate an external rod lock or pilot-operated check valve if the application demands position holding.
Quick checklist
At 0.5 MPa, this 40 mm bore double-acting cylinder provides 628.3 N of push force and 527.8 N of pull force. At 0.7 MPa, push increases to 879.6 N and pull to 738.9 N. The theoretical maximum push force is 128 kgf at 1.0 MPa.
It uses a fixed NBR bumper at each end to decelerate the piston, which is not a field-adjustable air cushion. For high-speed or high-energy loads, you should slow the approach or add an external shock absorber. Additionally, it does not hold its load if air is lost; the piston drifts, so an external rod lock or pilot-operated check valve is required for position holding.
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