Airtac SDAD Double Rod Slim Cylinder SDAD40X70S
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD40X70S is a genuine double-acting COMPACT cylinder with a piston rod out BOTH ends (Ø40mm bore, 70mm 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
- Stroke70 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 SDAD40X70S
The AirTAC SDAD40X70S is a compact double-acting 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 on extend and retract, yielding exactly 527.8 N of push and pull force at 0.5 MPa. This symmetric output is a major advantage when driving loads that require consistent momentum in both directions.
A 70 mm stroke fits within the 130 mm standard limit for this 40 mm bore. The 16 mm diameter rod resists twisting during operation, while the built-in magnet (-S) enables position detection using reed or electronic switches. End-of-stroke deceleration is handled by a fixed NBR bumper, which absorbs shock but is not an adjustable air cushion.
Airtac SDAD Double Rod Slim Cylinder SDAD40X70S Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD40X70S |
|---|---|
| Series | SDAD compact double-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 70 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 SDAD40X70S
| SDAD | Compact double-acting cylinder, rod out both ends. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SDAD40X70S Is Used
Gripper Jaw Sync
Drives opposing gripper jaws where the equal 527.8 N extend and retract force ensures balanced clamping pressure on precision machined parts.
Elevator Counterbalance
Lifts a 26.9 kg vertical platform using the through-rod design to prevent platform twist during ascent and descent cycles.
Dual-End Transfer
Mounts a pusher plate on one rod end and a magnetic dog on the other, allowing the 70 mm stroke to move components while triggering a remote sensor.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD40X70S the Right Cylinder?
When sizing this model, consider the neighbouring bores: stepping down to SDAD32 provides 345.6 N at 0.5 MPa, while stepping up to SDAD50 yields 824.7 N. For the SDAD40X70S, a safe working load is approximately 317 N (about 60 percent of the 0.5 MPa figure), translating to a vertical lift capacity of roughly 26.9 kg with a 2:1 safety margin. The 16 mm rod uses an M8x1.25 female thread, and the air supply connects via a PT1/8 port.
The through-rod geometry prevents rotation and allows mounting a tool on one end with a dog or switch on the opposite side. Remember that a plain cylinder does not hold position if air pressure drops 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. This configuration includes the -S magnet for sensing and operates at 30-500 mm/s.
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 SDAD40X70S FAQ
The push and pull forces are equal because the rod exits both ends. 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, with a proof pressure of 1.5 MPa.
Yes, the through-rod resists twisting and allows you to attach a tool on one end and a switch dog on the other. The included -S magnet works with AirTAC reed or electronic switches mounted in the body grooves.
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