Airtac SDAD Double Rod Slim Cylinder SDAD40X55S
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD40X55S 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 SDAD40X55S
The AirTAC SDAD40X55S 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 on extend and retract, yielding equal push and pull force of 527.8 N at 0.5 MPa. This symmetric output is highly advantageous for balanced tooling and consistent motion control.
Equipped with a built-in magnet (-S), this unit supports AirTAC reed or electronic switches for position sensing. The 40 mm bore utilizes a 16 mm rod and PT1/8 port, while the short body design minimizes axial footprint. End-of-stroke deceleration is handled by a fixed NBR bumper, which absorbs shock without requiring manual adjustment.
Airtac SDAD Double Rod Slim Cylinder SDAD40X55S Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD40X55S |
|---|---|
| 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 SDAD40X55S
| 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 SDAD40X55S Is Used
Gripper Jaw Synchronization
Drives opposing gripper fingers where the 527.8 N equal bidirectional force ensures balanced clamping pressure on delicate components during transfer.
Dual-End Transfer Pusher
Mounts a pusher plate on one rod end and a position dog on the other, utilizing the anti-rotation through-rod to prevent part misalignment on the belt.
Symmetric Lift Station
Raises and lowers a 26.9 kg vertical payload using the consistent extend and retract forces, maintaining smooth deceleration via the fixed NBR bumpers.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD40X55S the Right Cylinder?
When sizing this unit, compare its 527.8 N @0.5 MPa capacity against adjacent bores: the SDAD32 provides 345.6 N, while the SDAD50 offers 824.7 N. For this 40 mm model, a safe working load is approximately 317 N (about 60% of the 0.5 MPa figure), allowing a vertical lift of roughly 26.9 kg with a 2:1 safety margin. The through-rod geometry prevents twisting and permits mounting a tool on one end and a dog on the opposite side.
This configuration includes the -S magnet for switch readiness and female rod-end threads (M8x1.25) on both ends. Remember that a standard cylinder drifts when air is removed or a valve centers; the fixed NBR bumper only decelerates the stroke end and cannot hold a load. For secure positioning without live pressure, integrate an external rod lock or pilot-operated check valve.
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 SDAD40X55S 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.
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 and does not act as a brake. For load holding, you must use an external rod lock or a pilot-operated check valve.
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