The AirTAC AirTAC SDA40X85S Compact Cylinder | 40mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø40mm bore and 85mm 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 SDA40X85S 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 a highly abbreviated unit, drastically reducing axial mounting depth compared to conventional round-body designs. The 16 mm piston rod features an M8x1.25 female thread for straightforward load coupling.
This unit includes the S option, meaning a built-in piston magnet enables position detection via an AirTAC reed or electronic switch seated in the body grooves. End-of-stroke energy is managed strictly by a fixed NBR bumper rather than an adjustable cushion, which safely decelerates the piston near stroke limits. Operating efficiently between 30-500 mm/s, the 40 mm bore is hard-anodized to minimize friction and extend pneumatic service life.
| Model | AirTAC SDA40X85S Compact Cylinder | 40mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 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. |
| ×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 routing gates on high-speed packaging lines where the 85 mm stroke pushes parcels between adjacent belts using a reliable 628.3 N extend force.
Drives the secondary locking arm in automated tool changer carousels, utilizing the built-in magnet to confirm tool engagement via solid-state sensors.
Raises and lowers physical stop blocks at conveyor accumulation zones, absorbing end-impact with the fixed NBR bumper while handling heavy pallet transitions.
When sizing this model, evaluate your force margins carefully: the SDA32 provides 402.1 N of push at 0.5 MPa, while the larger SDA50 yields 981.7 N at the same pressure. For the SDA40X85S, the 628.3 N output translates to a safe working load of roughly 377 N (about 60% capacity) or a vertical lift capability of approximately 32 kg with a 2:1 safety factor. To finalize your order, confirm the 40 mm bore, 85 mm stroke, PT1/8 port, the S magnet requirement, and the female rod-end thread.
Keep in mind that a standard double-acting cylinder like this will drift and cannot hold a load if air pressure drops or the directional valve is centered. The fixed NBR bumper only decelerates the stroke near its end points; it does not function as a mechanical lock or brake. If your application demands strict position holding without live pressure, you must integrate an external rod lock or a pilot-operated check valve into your pneumatic circuit.
Quick checklist
At 0.5 MPa the push force is 628.3 N and the pull force is 527.8 N. At 0.7 MPa the push force is 879.6 N and the pull force is 738.9 N. The theoretical maximum push force is 128 kgf at 1.0 MPa, with a maximum operating pressure of 1.0 MPa and a proof pressure of 1.5 MPa.
It relies on a fixed NBR bumper at each end to decelerate the piston, which is not an adjustable air cushion, so high-speed applications may require external shock absorbers. The S option provides a built-in magnet for use with AirTAC reed or electronic switches in the body grooves.
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