The AirTAC SDAT double acting multi-position cylinder SDAT20X30X20SB is a genuine COMPACT duplex cylinder (Ø20mm bore) built from two stacked piston sections of 0 mm and 0 mm. Switching the two chambers gives fixed rod stops at 0, 0 and 0 mm — three repeatable positions from a single actuator.
The SDAT20X30X20SB is a double-acting compact duplex multi-position cylinder. Its two stacked piston sections give mechanical stops at 0, 30 and 50 mm, picked by switching the two air chambers - so one short body replaces two cylinders or a bolt-on stopper. Force is set by a single piston area only: expect 157.1 N push at 0.5 MPa, identical to a single SDA bore 20, meaning the duplex adds positions, not thrust.
The B code supplies a male M6x1.0 rod thread, and the built-in magnet pairs with AirTAC reed or electronic switches seated in the body grooves, letting a PLC confirm every stop electrically. Travel spans 30-500 mm/s. Cushioning is a fixed NBR bumper that absorbs end shock but cannot be adjusted like an air cushion.
| Model | Airtac SDAT double acting multi-position cylinder SDAT20X30X20SB |
|---|---|
| Series | SDAT compact duplex (multi-position) cylinder |
| Bore size | Ø20 mm |
| Stroke 1 / Stroke 2 | 0 / 0 mm |
| Fixed positions | 0 / 0 / 0 mm |
| Port size | M5×0.8 |
| Rod end thread | M4×0.7 F / M6×1.0 male (B) |
| Acting type | Double acting, duplex |
|---|---|
| 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 |
| Stroke rule | Stroke 1 + Stroke 2 ≤ standard max |
Stroke 1 + Stroke 2 must not exceed the standard stroke maximum for the bore. Confirm the exact stop sequence against the AirTAC SDAT datasheet before wiring the valves.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 kgf | |
Force is set by the single piston area (same as an SDA of this bore) — the duplex design adds positions, not thrust. Actual usable force is lower than theoretical.
| SDAT | Compact duplex (multi-position) cylinder. |
|---|---|
| 20 | Bore size in mm. |
| ×0 | Stroke 1 (first section) in mm. |
| ×0 | Stroke 2 (second section) in mm. |
| S / B | S = magnet; B = male-thread rod (both optional). |
Thread: PT standard. Related: SDAW (duplex-end multi-position), SDA (single position), SDAD (double rod), SDAJ (adjustable stroke).
A sorter uses 0 mm to let cartons pass, 30 mm for a shallow kick-off and 50 mm for a full divert - three fixed gates from one bore 20 body pushing 157.1 N at 0.5 MPa.
On a tray infeed, the rod raises product guides to 0, 30 or 50 mm so packs of different depths each meet their own stop face without swapping hardware.
A bowl outfeed advances parts a first 30 mm increment, then a further 20 mm into the load nest; chamber switching selects the stop with no jamming links.
For pushing duty, bore 20 delivers 157.1 N at 0.5 MPa; drop to bore 16 (100.5 N) for lighter work or rise to bore 25 (245.4 N) when more force is needed. Two solenoid lines are required to reach all three stops. A plain SDAT does not hold position or load once air is lost - the mechanical stops need live pressure - so fit an external lock for unpowered holding. Confirm bore 20, S1 = 30, S2 = 20, the M5x0.8 port, magnet code S and male rod thread B before ordering.
Quick checklist
Stops sit at 0, 30 and 50 mm. Force matches one bore 20 piston, not a doubled output: 157.1 N push and 131.9 N pull at 0.5 MPa, 219.9 N push at 0.7 MPa, and up to 32 kgf push at 1.0 MPa. Cycle speed is 30-500 mm/s.
Chamber switching: pressurising the two sections in the right combination parks the rod at 0, S1 or S1+S2. The built-in magnet works with AirTAC reed or electronic (solid-state) switches clipped into the body grooves to signal each position. The NBR bumper is fixed, not adjustable.
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