Airtac SDAD Double Rod Slim Cylinder SDAD40X85S
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD40X85S 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 SDAD40X85S
The AirTAC SDAD40X85S is a double-acting compact cylinder featuring a through-rod that exits both ends of the riveted body. Because the piston rod occupies both chambers, the annular area is identical in each direction, giving you exactly 527.8 N of push and pull force at 0.5 MPa. This symmetric thrust is essential for mechanisms requiring consistent bi-directional power.
The through-rod geometry inherently resists twisting, letting you mount a work tool on one end and a position dog on the opposite side. The short body profile minimizes axial footprint, while the fixed NBR bumpers absorb end-of-stroke shocks. A built-in magnet (-S) enables tracking via reed or electronic switches, and the 16 mm rods use an M8x1.25 female thread.
Airtac SDAD Double Rod Slim Cylinder SDAD40X85S Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD40X85S |
|---|---|
| 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 SDAD40X85S
| 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 SDAD40X85S Is Used
Symmetric Transfer Jaws
Drives a gripping jaw on the front rod while the rear rod pushes a synchronized diverter, utilizing the equal 527.8 N bi-directional thrust for perfectly balanced part handling.
Anti-Rotation Vertical Lift
Lifts a 26.9 kg guided platen without twisting, relying on the through-rod geometry to maintain strict vertical alignment during compact elevator cycles.
Dual-End Cam Positioning
Mounts a forming tool on the front end and a cam dog on the rear end, allowing a reed or electronic switch to confirm the 85 mm stroke completion externally.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD40X85S the Right Cylinder?
When sizing this 40 mm bore, compare its 527.8 N @0.5 MPa output against adjacent models. Dropping to the SDAD32 yields 345.6 N, whereas stepping up to the SDAD50 provides 824.7 N. Factoring a 2:1 safety margin, this unit safely lifts around 26.9 kg vertically, equating to a safe working load of roughly 317 N. The 85 mm stroke sits well within the 130 mm standard limit, and the PT1/8 port matches the 32/40 mm family.
The dual-end rod delivers superior anti-rotation stability for guided lifts. Remember that a standard cylinder drifts when air is removed or the valve centers, as the NBR bumper only decelerates the stroke end without locking the piston. For suspended loads requiring fail-safe holding, integrate an external rod lock or pilot-operated check valve. This configuration includes the -S magnet for sensing and standard female rod-end threads on both sides.
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 SDAD40X85S FAQ
The double-rod design provides equal force in both directions: 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. Operating pressure ranges from 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa.
The through-rod resists twisting and allows you to mount a tool on one end and a position dog on the other. Because the rod occupies both chambers, the extend and retract areas are identical, ensuring push force equals pull force for symmetric loads.
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