Airtac SDAD Double Rod Slim Cylinder SDAD20X55S
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD20X55S is a genuine double-acting COMPACT cylinder with a piston rod out BOTH ends (Ø20mm bore, 55mm stroke). The through-rod resists twisting and lets you drive a tool on one end while a switch or dog reads position on the other — with identical force in both directions.
- BoreØ20 mm
- Stroke55 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod
- Rod threadM4×0.7 (F) / M6×1.0 (B)
- CushionFixed NBR bumper (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SDAD Double Rod Slim Cylinder SDAD20X55S
The AirTAC SDAD20X55S is a compact double-acting cylinder featuring a through-rod that exits both ends of the riveted body. Because the rod occupies both chambers, the annular area is identical in each direction, delivering an equal push and pull force of 131.9 N at 0.5 MPa. This symmetry is highly advantageous for loads requiring consistent actuation speed and thrust on extension and retraction.
Equipped with a built-in magnet (-S), this unit supports AirTAC reed or electronic switches for position detection. The 8 mm rod at each end provides inherent anti-rotation resistance, while the short body footprint saves axial mounting depth. End-of-stroke deceleration is handled by a fixed NBR bumper, operating smoothly within the 30-500 mm/s speed range.
Airtac SDAD Double Rod Slim Cylinder SDAD20X55S Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD20X55S |
|---|---|
| Series | SDAD compact double-rod cylinder |
| Bore size | Ø20 mm |
| Stroke | 55 mm |
| Acting type | Double acting, rod both ends |
| 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 |
Because a rod occupies both cylinder chambers, the effective area — and therefore the force — is identical in both directions. Specifications follow the official AirTAC SDAD datasheet.
Theoretical Output Force (Ø20mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 132 N |
| 0.7 MPa | 185 N |
| Max (@1.0 MPa) | 27 kgf |
Force uses the annular (rod-side) area on both strokes, so extend and retract match. Actual usable force is lower than theoretical due to friction. Size with a safety margin.
Model Code: Airtac SDAD Double Rod Slim Cylinder SDAD20X55S
| SDAD | Compact double-acting cylinder, rod out both ends. |
|---|---|
| 20 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch sensing (omit = none). |
| B | Male-thread piston rods (omit = female thread). |
Thread: PT standard. Related SDA-family variants: SDA (single rod), SSA/STA (single acting), SDAJ (adjustable stroke), SDAT (duplex), SDAW (duplex-end).
Where the Airtac SDAD Double Rod Slim Cylinder SDAD20X55S Is Used
Symmetric Transfer Chuck
Picks and places delicate wafers using identical 131.9 N force on both extend and retract strokes, preventing grip deformation during the 55 mm travel.
Dual-End Guiding Jig
Drives a machining fixture on the front rod while the rear rod simultaneously operates a mechanical dog, leveraging the 8 mm through-rod for strict anti-rotation control.
Film Feed Tensioner
Maintains steady web tension in a packaging line, using the equal annular areas to pull and release film smoothly at up to 500 mm/s without twisting.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD20X55S the Right Cylinder?
When sizing this 20 mm bore model, consider the neighbouring bores: stepping down to SDAD16 yields 86.4 N at 0.5 MPa, while stepping up to SDAD25 provides 206.2 N. For the SDAD20X55S, a safe working load is roughly 79 N (about 60% of the 131.9 N figure), allowing a vertical lift of approximately 6.7 kg with a 2:1 safety margin. The through-rod design prevents twisting and permits mounting a tool on one end and a sensor dog on the opposite side.
This configuration features a 55 mm stroke, an M5x0.8 port, and female M4x0.7 rod-end threads on both ends. Note that a plain cylinder does not hold position if air pressure is lost or the valve is centred; the piston will drift. For load holding without live pressure, install an external rod lock or a pilot-operated check valve.
Quick checklist
- ✓ Need equal force both directions?
- ✓ Anti-rotation / dual-end mounting?
- ✓ Space for a rod that exits both ends
- ✓ Port/thread type (PT)
- ✓ Magnet (S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Leave clearance for the rod exiting both ends.
- check Avoid side load on either rod end.
- check Front/rear covers are riveted — do not dismantle.
- check Installation by qualified personnel per AirTAC docs.
Airtac SDAD Double Rod Slim Cylinder SDAD20X55S FAQ
Because the double-rod design creates equal annular areas, the force is identical in both directions: 131.9 N at 0.5 MPa, 184.7 N at 0.7 MPa, with a theoretical maximum of 27 kgf at 1.0 MPa.
Yes, the through-rod exits both ends, allowing you to drive a load on one side while mounting a dog for a reed or electronic switch on the opposite side. The design also resists mechanical rotation.
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