Airtac SDAD Double Rod Slim Cylinder SDAD40X85SB
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD40X85SB 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 SDAD40X85SB
The AirTAC SDAD40X85SB 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 exactly 527.8 N of push and pull force at 0.5 MPa. This symmetry is essential when driving loads that must move with balanced energy in both strokes.
Equipped with a built-in magnet for AirTAC reed or electronic switches, this unit allows position sensing at either end. The 16 mm rods feature male M14x1.5 threads on both sides for direct tool mounting. End-of-stroke deceleration is handled by a fixed NBR bumper, which absorbs shock without the complexity of adjustable air cushions. Operating speed ranges from 30 to 500 mm/s.
Airtac SDAD Double Rod Slim Cylinder SDAD40X85SB Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD40X85SB |
|---|---|
| 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 SDAD40X85SB
| 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 SDAD40X85SB Is Used
Gripper Jaw Actuation
Drives symmetric gripper mechanisms where the 527.8 N equal push and pull force ensures balanced clamping pressure on both strokes.
Dual-End Transfer Pusher
Uses the anti-rotation through-rod to push a part on one end while a dog triggers an electronic switch on the opposite end simultaneously.
Vertical Lift Station
Lifts a 26.9 kg payload vertically with a 2:1 safety margin, relying on the fixed NBR bumper to soften the 85 mm stroke impacts.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD40X85SB the Right Cylinder?
When sizing this 40 mm bore, compare it directly with its neighbors: the SDAD32 provides 345.6 N at 0.5 MPa, while the larger SDAD50 offers 824.7 N. This SDAD40X85SB sits comfortably in the middle, delivering a safe working load of roughly 317 N (about 60% of the 0.5 MPa figure) and a vertical lift capacity of approximately 26.9 kg with a 2:1 safety margin. The 85 mm stroke falls within the 130 mm standard limit.
The through-rod geometry prevents twisting and lets you mount a tool on one end and a dog on the other. Remember that a plain cylinder drifts when air is lost or the valve centers, as the fixed bumper only decelerates near the stroke end; use an external rod lock or pilot-operated check valve for load holding. This configuration includes the S magnet and B male M14x1.5 rod threads, with PT1/8 ports.
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 SDAD40X85SB FAQ
Because the rod exits both ends, the push and pull forces are equal: 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.
No, the piston will drift if air is lost or the valve is centered. The fixed NBR bumper only decelerates the stroke near the end points and does not act as a brake. For load holding, you must install an external rod lock or a pilot-operated check valve.
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