The AirTAC AirTAC SDA20X25SH Compact Cylinder | 20mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø20mm bore and 25mm stroke, M5×0.8 air ports and a riveted short body that saves mounting depth. Sensor slots around the body accept magnetic switches for position sensing.
The AirTAC SDA20X25SH is a double-acting, single-rod compact cylinder engineered for tight machinery footprints. Its riveted assembly minimizes axial mounting depth compared to conventional round-body units, while delivering 157.1 N of push force at 0.5 MPa. This specific configuration includes an -S piston magnet for position sensing and an -H fluororubber (FKM) seal for enhanced thermal and oil resistance.
The 20 mm bore features an 8 mm rod and M5x0.8 porting. End-stop deceleration relies on a fixed NBR bumper rather than an adjustable air cushion, meaning operators should slow the approach or add external shock absorbers for high-energy loads. The integrated magnet interfaces directly with AirTAC reed or electronic switches mounted in the body grooves.
| Model | AirTAC SDA20X25SH Compact Cylinder | 20mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø20 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | M5×0.8 |
| Rod end thread | M4×0.7 female / M6×1.0 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 90 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 | 157 N | 132 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 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. |
|---|---|
| 20 | Bore size in mm. |
| ×25 | 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 cutting head or clamping fence in automated PCB routing stations, where the short 25 mm stroke and compact depth fit neatly within dense electronics assembly equipment.
Provides the 157.1 N push at 0.5 MPa needed to press heated sealing dies against blister card stock, with the FKM seal resisting any degraded heat or oil from nearby thermal processes.
Moves a dosing needle into precise alignment for reagent dispensing, utilizing the built-in magnet to trigger a reed or electronic switch for accurate volumetric metering.
Selecting this 20 mm bore yields a safe working load around 94 N (roughly 60% of its 157.1 N push at 0.5 MPa), translating to a vertical lift capacity of about 8 kg with a 2:1 safety margin. If your application requires less force, the SDA16 provides 100.5 N at 0.5 MPa; for heavier demands, the SDA25 steps up to 245.4 N at 0.5 MPa.
Keep in mind that a standard compact cylinder drifts when air pressure is lost or the valve is centered, as the fixed bumper only decelerates near stroke end rather than locking the rod. To hold a load securely without live pressure, an external rod lock or pilot-operated check valve is required. When ordering, confirm the 20 mm bore, 25 mm stroke, M5x0.8 port, female M4x0.7 rod thread, plus the S (magnet) and H (FKM seal) options.
Quick checklist
This 20 mm bore double-acting cylinder generates 157.1 N push and 131.9 N pull at 0.5 MPa, increasing to 219.9 N push and 184.7 N pull at 0.7 MPa. The theoretical maximum push is 32 kgf at 1.0 MPa. It operates between 0.15-1.0 MPa, with a proof pressure of 1.5 MPa, and runs at speeds from 30-500 mm/s.
It uses a fixed NBR bumper at each end to decelerate the piston, which is not a field-adjustable air cushion. If your cycle runs at high speeds, you should add an external shock absorber. Additionally, the bumper is not a locking device; the rod will drift if air is lost, so a pilot-operated check valve or external rod lock is needed to hold a load.
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