Airtac SDAD Double Rod Slim Cylinder SDAD40X55
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD40X55 is a genuine double-acting COMPACT cylinder with a piston rod out BOTH ends (Ø40mm bore, 55mm 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
- Stroke55 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 SDAD40X55
The AirTAC SDAD40X55 is a compact double-acting cylinder featuring a 16 mm through-rod extending from both ends of its riveted body. Because the rod occupies both chambers, the annular area is identical in each direction, yielding exactly 527.8 N of push and pull force at 0.5 MPa. This symmetry is ideal for driving balanced loads without directional force bias.
The through-rod geometry inherently resists twisting, allowing you to mount a work tool on one end and a position dog on the opposite side simultaneously. End-of-stroke energy is managed by a fixed NBR bumper that decelerates the piston rather than acting as an adjustable air cushion. With a 55 mm stroke and PT1/8 port, this unit operates efficiently within a 30-500 mm/s speed range.
Airtac SDAD Double Rod Slim Cylinder SDAD40X55 Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD40X55 |
|---|---|
| Series | SDAD compact double-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 55 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 SDAD40X55
| SDAD | Compact double-acting cylinder, rod out both ends. |
|---|---|
| 40 | Bore size in mm. |
| ×55 | 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 SDAD40X55 Is Used
Gripper Jaw Actuation
Drives symmetrical gripper jaws where the 527.8 N equal push/pull force ensures consistent clamping pressure on both extend and retract strokes.
Dual-End Transfer Pusher
Mounts a pusher plate on one rod end and a dog target on the opposite end, utilizing the anti-rotation through-rod to maintain precise alignment during part transfer.
Balanced Vertical Lift
Lifts lightweight platens vertically with matched force both ways, preventing sagging drift on the return stroke thanks to the equal annular area design.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD40X55 the Right Cylinder?
When sizing this model, 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. Based on the 527.8 N figure, a safe working load is approximately 317 N (60 percent capacity), translating to a vertical lift capability of roughly 26.9 kg with a 2:1 safety margin.
The through-rod prevents rotation and enables dual-end actuation, but a standard cylinder drifts when air pressure is lost or the valve centers. For load holding without live pressure, integrate an external rod lock or pilot-operated check valve. This configuration includes a 40 mm bore, 55 mm stroke, female M8x1.25 rod threads, and no piston magnet, meaning magnetic switches cannot be fitted unless upgraded to the -S variant.
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 SDAD40X55 FAQ
The SDAD40X55 generates 527.8 N at 0.5 MPa and 738.9 N at 0.7 MPa, with a theoretical maximum of 108 kgf at 1.0 MPa. Because it is a double-rod cylinder, the push and pull forces are exactly equal in both directions. The maximum operating pressure is 1.0 MPa.
Yes, the 16 mm through-rod exits both sides of the body, allowing you to drive a tool on one end and mount a dog on the other. The dual-rod geometry also resists twisting. Note that this specific SKU lacks a piston magnet, so position sensing requires the -S variant for reed or electronic switches.
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