The AirTAC AirTAC SDA40X70SB Compact Cylinder | 40mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø40mm bore and 70mm 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 SDA40X70SB is a double-acting single-rod compact cylinder engineered to deliver 628.3 N of push force and 527.8 N of pull force at 0.5 MPa. Its riveted assembly merges the barrel, rear cover, piston, and rod into an exceptionally short axial package, drastically reducing mounting depth where a conventional round-body unit would not fit. The bore is hard-anodized and relies on a two-way piston seal for reliable operation.
This specific configuration includes a built-in piston magnet (-S) for direct mounting of AirTAC reed or electronic switches along the body grooves, plus a male M14x1.5 thread (-B) on the 16 mm rod for secure load coupling. End-stopping is handled by a fixed NBR bumper that decelerates the piston near stroke end rather than acting as a lock or brake. Operating speed spans 30-500 mm/s.
| Model | AirTAC SDA40X70SB Compact Cylinder | 40mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø40 mm |
| Stroke | 70 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. |
| ×70 | 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 onto machining centers using the 628.3 N extend force, with the male M14x1.5 rod threading directly into custom jaw fixtures.
Drives mechanical folding arms on high-speed corrugated box lines, benefiting from the short riveted body to fit within tight conveyor side frames.
Actuates a diverting gate to route incoming product lanes, using the built-in magnet and an electronic switch to confirm the 70 mm stroke position.
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 model, a safe working load is roughly 377 N (about 60% of the 628.3 N figure), translating to a vertical lift capacity of approximately 32 kg with a 2:1 safety margin. To finalize your order, confirm the 40 mm bore, 70 mm stroke, PT1/8 port, built-in magnet, and the male M14x1.5 rod end.
Keep in mind that a standard compact cylinder does not hold its position if air pressure drops or the valve is centered; the piston will drift, and the fixed NBR bumper only decelerates it near the end of travel. If your application must hold a load without live pressure, you will need to integrate an external rod lock or a pilot-operated check valve.
Quick checklist
At 0.5 MPa, this 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, which is the maximum operating pressure.
No, it uses a fixed NBR bumper at each end to decelerate the piston near the stroke extremes. This bumper is not an adjustable air cushion and does not function as a lock or brake. For high-speed or high-energy cycles, you should add an external shock absorber or slow down the approach speed.
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