Airtac SDAD Double Rod Slim Cylinder SDAD40X85B
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD40X85B 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 SDAD40X85B
The AirTAC SDAD40X85B is a double-acting compact cylinder featuring a through-rod that exits both ends of the riveted body. Because the rod occupies each chamber equally, the annular area remains constant, delivering identical push and pull forces of 527.8 N at 0.5 MPa. This symmetric output is highly advantageous for applications requiring consistent drive in both directions.
Equipped with male M14x1.5 threads on both 16 mm rod ends, this unit saves axial mounting depth compared to standard profile bodies. It relies on a fixed NBR bumper to decelerate at stroke end rather than an adjustable air cushion. Note this SKU lacks a piston magnet, so position sensing is not supported without the -S option.
Airtac SDAD Double Rod Slim Cylinder SDAD40X85B Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD40X85B |
|---|---|
| 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 SDAD40X85B
| 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 SDAD40X85B Is Used
Gripper Jaw Actuation
Drives opposing gripper fingers with equal 527.8 N force in both directions, ensuring balanced clamping pressure on precision machined parts.
Reciprocating Transfer
Uses the anti-rotation through-rod to shuttle components between two stations without twisting, mounting a tool on one end and a dog on the other.
Symmetric Lift Station
Lifts and lowers a 26.9 kg vertical load with a 2:1 safety margin, relying on the identical extend and retract forces to prevent load bias.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD40X85B the Right Cylinder?
When sizing this 40 mm bore, compare its 527.8 N output at 0.5 MPa against adjacent models. Stepping down to SDAD32 yields 345.6 N, while stepping up to SDAD50 provides 824.7 N. The through-rod geometry prevents twisting and permits mounting a tool on one end and a dog on the opposite side. A safe working load is roughly 317 N, allowing a vertical lift of about 26.9 kg with a 2:1 margin.
Remember that a plain cylinder drifts when air is lost or the valve centers, as the fixed bumper only decelerates near the stroke end and acts as no lock. For load holding without live pressure, install an external rod lock or pilot-operated check valve. This configuration specifies an 85 mm stroke, PT1/8 port, no magnet, and male M14x1.5 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 SDAD40X85B FAQ
The double-rod design provides equal force in both directions: 527.8 N at 0.5 MPa, 738.9 N at 0.7 MPa, and a theoretical maximum of 108 kgf at 1.0 MPa.
Yes, the through-rod exits both ends with male M14x1.5 threads, allowing you to drive a tool on one side while mounting a dog or secondary mechanism on the other, while also resisting rotation.
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