Airtac SDAD Double Rod Slim Cylinder SDAD20X40S
The AirTAC Airtac SDAD Double Rod Slim Cylinder SDAD20X40S is a genuine double-acting COMPACT cylinder with a piston rod out BOTH ends (Ø20mm bore, 40mm 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.
- BoreØ20 mm
- Stroke40 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod
- Rod threadM4×0.7 (F) / M6×1.0 (B)
- CushionFixed NBR bumper (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SDAD Double Rod Slim Cylinder SDAD20X40S
The AirTAC SDAD20X40S is a compact double-acting pneumatic 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, yielding exactly 131.9 N of force at 0.5 MPa on both the extend and retract strokes.
This symmetric thrust is ideal for balanced tooling. The built-in magnet (-S) enables position detection via AirTAC reed or electronic switches mounted directly into the body grooves. End-of-stroke deceleration is handled by fixed NBR bumpers, and the short footprint saves valuable axial mounting depth in tight machinery.
Airtac SDAD Double Rod Slim Cylinder SDAD20X40S Technical Specifications
| Model | Airtac SDAD Double Rod Slim Cylinder SDAD20X40S |
|---|---|
| Series | SDAD compact double-rod cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 mm |
| Acting type | Double acting, rod both ends |
| Port size | M5×0.8 |
| Rod end thread | M4×0.7 female / M6×1.0 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 90 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 (Ø20mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 132 N |
| 0.7 MPa | 185 N |
| Max (@1.0 MPa) | 27 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 SDAD20X40S
| SDAD | Compact double-acting cylinder, rod out both ends. |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 SDAD20X40S Is Used
Symmetric Transfer Jaws
Drives a gripper on the front rod and a tracking dog on the rear, using the 131.9 N equal thrust for balanced part shuttling without rotational twist.
Vertical Lift Stops
Raises and lowers a 6.7 kg fixture with a 2:1 margin, relying on the through-rod geometry to prevent binding during vertical ascent and descent.
Dual-End Marking Press
Mounts a stamping head on one end and an electronic switch target on the other, ensuring precise 40mm travel registration in a confined riveted body.
Is the Airtac SDAD Double Rod Slim Cylinder SDAD20X40S the Right Cylinder?
When sizing this 20mm bore, note the SDAD16 provides 86.4 N while the SDAD25 offers 206.2 N at 0.5 MPa. This model provides a safe working load of roughly 79 N (about 60% of the 131.9 N capacity) and can vertically lift approximately 6.7 kg with a 2:1 safety margin. The through-rod design resists twisting and allows driving a tool on one end while mounting a detection dog on the opposite side.
Configuration confirms a 40mm stroke, M5x0.8 air port, and female M4x0.7 rod-end threads. Remember that a standard cylinder does not hold position if air pressure drops or the valve centers; the piston will drift. For load holding 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 SDAD20X40S FAQ
Because the double-rod design creates equal annular areas, push and pull forces are identical: 131.9 N at 0.5 MPa, 184.7 N at 0.7 MPa, and a maximum theoretical output of 27 kgf at 1.0 MPa.
Yes, the through-rod extends from both sides, allowing you to mount a tool on one end and a detection target on the other. The included magnet (-S) works with AirTAC reed or electronic switches for position sensing.
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