The AirTAC AirTAC SDA50X85SB Compact Cylinder | 50mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø50mm bore and 85mm stroke, PT1/4 air ports and a riveted short body that saves mounting depth. Sensor slots around the body accept magnetic switches for position sensing.
The AirTAC SDA50X85SB is a double-acting, single-rod compact cylinder engineered to deliver 981.7 N of push force and 824.7 N of pull force at 0.5 MPa. Its riveted body assembly significantly reduces axial mounting depth compared to conventional round-body units, making it highly effective for conserving machine footprint in tight assemblies. The bore is hard-anodized, and the piston relies on a two-way seal for efficient pneumatic operation.
This specific configuration includes a built-in piston magnet (-S) for direct compatibility with AirTAC reed or electronic switches mounted in the body grooves, plus a male-thread piston rod (-B) sized at M18x1.5 for secure mechanical load coupling. End-stopping is handled by a fixed NBR bumper which decelerates the piston near stroke limits; it is not an adjustable air cushion, so high kinetic energy applications should utilize external shock absorbers. The 85 mm stroke operates within a 30-500 mm/s speed range via a PT1/4 port.
| Model | AirTAC SDA50X85SB Compact Cylinder | 50mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø50 mm |
| Stroke | 85 mm |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod end thread | M10×1.5 female / M18×1.5 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | Bore size in mm. |
| ×85 | 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).
Actuates a routing flap on a high-speed logistics conveyor, utilizing the 85 mm stroke to redirect parcels up to 50 kg safely into secondary sorting lanes.
Drives the top folding mechanism on an automated packaging line, where the compact riveted body minimizes frame intrusion and the male M18x1.5 rod secures the folding arm.
Functions as a secondary parts ejector in plastic molding, providing 981.7 N of push force at 0.5 MPa to free lightweight components from the tool cavity.
When sizing this actuator, evaluate your force requirements against adjacent bores: stepping down to the SDA40 reduces the 0.5 MPa push capacity to 628.3 N, while moving up to the SDA63 increases it substantially to 1558.6 N. For the SDA50X85SB, the computed safe working load is approximately 589 N (about 60% of the 981.7 N capacity at 0.5 MPa), translating to a vertical lift capability of roughly 50 kg with a 2:1 safety margin. To finalize your order, confirm the 50 mm bore, 85 mm stroke, PT1/4 port, male M18x1.5 rod thread, and the required magnetic switch option.
Keep in mind that a standard double-acting cylinder does not hold its position if air pressure is lost or the directional valve is centered—the piston will drift, and the fixed NBR bumper only decelerates the stroke end rather than locking the load. If your application demands strict position holding without live pressure, you must integrate an external rod lock or a pilot-operated check valve into the pneumatic circuit.
Quick checklist
This double-acting cylinder provides 981.7 N push and 824.7 N pull at 0.5 MPa, and 1374.4 N push and 1154.5 N pull at 0.7 MPa. The theoretical maximum push force is 200 kgf at 1.0 MPa. It operates within a pressure range of 0.15-1.0 MPa, with a proof pressure of 1.5 MPa, and supports a speed range of 30-500 mm/s.
No, the SDA50X85SB uses a fixed NBR bumper at each end to decelerate the piston near the stroke limits; it is not an adjustable air cushion. For high-speed or high-energy loads, you should add an external shock absorber or slow the approach speed. Additionally, the -S option equips the piston with a magnet for use with AirTAC reed or electronic switches.
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