Airtac SDAD Double Rod Slim Cylinder SDAD20X85B
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD20X85B is a genuine double-acting COMPACT cylinder with a piston rod out BOTH ends (Ø20mm bore, 85mm 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
- Stroke85 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 SDAD20X85B
The AirTAC SDAD20X85B is a double-acting compact 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, giving an equal push and pull force of 131.9 N at 0.5 MPa. This symmetry is a major advantage when driving loads that require consistent kinetic energy on extension and retraction.
This specific SKU features male M6x1.0 threaded rods on both ends, allowing direct mounting of tooling or fixtures. The 85 mm stroke operates within the 100 mm standard limit, while the short body profile saves valuable axial mounting depth. End-of-stroke deceleration is handled by fixed NBR bumpers rather than adjustable air cushions. Note this unit lacks a piston magnet, so it cannot support position sensing without switching to the -S variant.
Airtac SDAD Double Rod Slim Cylinder SDAD20X85B Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD20X85B |
|---|---|
| Series | SDAD compact double-rod cylinder |
| Bore size | Ø20 mm |
| Stroke | 85 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 SDAD20X85B
| SDAD | Compact double-acting cylinder, rod out both ends. |
|---|---|
| 20 | Bore size in mm. |
| ×85 | 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 SDAD20X85B Is Used
Gripper Jaw Sync
Drives opposing gripper fingers with equal 131.9 N force in both directions, ensuring balanced clamping pressure on delicate components.
Transfer Push-off
Uses the dual male M6x1.0 rod ends to push a part off a line while simultaneously triggering a mechanical dog on the rear side.
Vertical Lift Station
Lifts a 6.7 kg payload vertically with a 2:1 margin, relying on the through-rod to prevent twisting during the 85 mm travel.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD20X85B the Right Cylinder?
When sizing this 20 mm bore model, consider the neighboring bores for your force requirements. Stepping down to the SDAD16 yields 86.4 N at 0.5 MPa, while moving up to the SDAD25 provides 206.2 N at 0.5 MPa. The 131.9 N output here gives a safe working load of roughly 79 N, or a vertical lift capacity of about 6.7 kg with a 2:1 safety margin.
The through-rod geometry resists twisting and lets you mount a tool on one end while leaving the opposite end free for mechanical sync. Remember that a plain cylinder drifts when air is lost or the valve centers; the fixed NBR bumper only decelerates the stroke end and will not hold the load. For load holding, install an external rod lock or pilot-operated check valve. This configuration specifies an M5x0.8 port, male M6x1.0 rod threads, and no magnet.
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 SDAD20X85B FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. It generates 131.9 N at 0.5 MPa and 184.7 N at 0.7 MPa, with a theoretical maximum of 27 kgf at 1.0 MPa. The maximum operating pressure is 1.0 MPa.
No, this specific SKU does not have a piston magnet. To use AirTAC reed or electronic switches, you must select the -S variant. The through-rod design still allows you to mount a tool on one male M6x1.0 end and a mechanical dog on the opposite end.
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