Airtac SDAD Double Rod Slim Cylinder SDAD40X85
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD40X85 is a genuine double-acting COMPACT cylinder with a piston rod out BOTH ends (Ø40mm 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.
- BoreØ40 mm
- Stroke85 mm
- Port sizePT1/8
- Acting typeDouble acting, double rod
- Rod threadM8×1.25 (F) / M14×1.5 (B)
- CushionFixed NBR bumper (both ends)
About the Airtac SDAD Double Rod Slim Cylinder SDAD40X85
The AirTAC SDAD40X85 is a double-acting compact cylinder featuring a through-rod that exits both ends of the riveted body. Because the 16mm rod occupies both chambers, the annular area is identical on extend and retract, yielding exactly 527.8 N of force at 0.5 MPa in each direction. This symmetry is highly advantageous when driving loads that require consistent push and pull dynamics.
The short body design drastically reduces axial mounting depth compared to conventional round-body units. End-of-stroke deceleration is handled by a fixed NBR bumper rather than an adjustable air cushion. Note this specific SKU lacks a piston magnet and therefore cannot support position sensing.
Airtac SDAD Double Rod Slim Cylinder SDAD40X85 Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD40X85 |
|---|---|
| Series | SDAD compact double-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 mm |
| Acting type | Double acting, rod both ends |
| 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 |
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 (Ø40mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 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 SDAD40X85
| SDAD | Compact double-acting cylinder, rod out both ends. |
|---|---|
| 40 | 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 SDAD40X85 Is Used
Symmetric Transfer Arms
Drives a pick-and-place arm requiring identical push and pull thrust to maintain smooth acceleration across the 85mm travel.
Anti-Rotation Guiding
The dual 16mm rods resist twisting moments during tight-tolerance pressing tasks where a single rod would bind.
Dual-End Tooling
Mounts a work fixture on one rod end and a mechanical dog on the opposite end to trigger external limit sensors.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD40X85 the Right Cylinder?
When sizing this unit, compare its bidirectional 527.8 N output at 0.5 MPa against adjacent bores: the SDAD32 provides 345.6 N, while the SDAD50 offers 824.7 N. This positions the 40mm bore as a robust mid-range choice. A safe working load is approximately 317 N, allowing a vertical lift of roughly 26.9 kg with a 2:1 safety margin.
The through-rod geometry prevents twisting and permits mounting a tool on one end and a dog on the opposite side. Remember that a standard cylinder drifts when air is removed or the valve centers; the fixed bumper only decelerates near stroke end and will not hold the load. For secure load holding without live pressure, install an external rod lock or pilot-operated check valve. This configuration specifies an 85mm stroke, PT1/8 port, and female M8x1.25 rod threads.
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 SDAD40X85 FAQ
The force is equal in both directions due to the double-rod design. It generates 527.8 N at 0.5 MPa and 738.9 N at 0.7 MPa. The theoretical maximum is 108 kgf at 1.0 MPa. The operating pressure range is 0.15 to 1.0 MPa.
Yes, the through-rod extends from both sides, allowing you to drive a tool on one end while using the opposite end for external dog mounting. This specific SKU lacks a piston magnet, so it cannot directly mount AirTAC reed or electronic switches without the -S variant.
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