Airtac SCD Standard Cylinder SCD50X40S
The AirTAC Airtac SCD Standard Cylinder SCD50X40S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø20mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø50mm bore, 40mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke40 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD50X40S
The SCD50X40S is a double-acting, double-rod pneumatic cylinder that provides identical force in both directions, delivering 825 N at 0.5 MPa. Its through-rod design, with a 20 mm diameter rod extending from both ends, makes it ideal for applications requiring a rear rod end for mounting a sensor flag, stopper, or secondary tooling.
This model includes a built-in magnet, allowing easy attachment of CMSG, DMSG, or EMSG reed or solid-state sensors directly to the tie-rod barrel for reliable end-of-stroke detection. With a 40 mm stroke and a compact body length of 207 mm, it fits neatly into automated fixtures where space is limited but dual-sided actuation is essential.
Airtac SCD Standard Cylinder SCD50X40S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD50X40S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 40 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCD (double-rod) datasheet. Because the rod runs through both caps, the effective area is (bore² − rod²) in both directions. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø50mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 kgf | |
Push and pull are EQUAL on a double-rod cylinder — both chambers lose the rod area, so effective area = (bore² − rod²) each way. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCD Standard Cylinder SCD50X40S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod), SCJ (adjustable stroke), SCT (multi-position). SCD mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCD Standard Cylinder SCD50X40S Is Used
Stroke Sensing on Both Ends
The rear rod provides a perfect mounting surface for a sensor flag, enabling end-of-stroke detection on the back side without adding length to the main tooling axis.
Equal Force Transfer Shuttle
Delivers a consistent 825 N in both extend and retract, ideal for a two-sided shuttle table where the load must be moved with the same force in each direction.
Compact Fixture Clamping
The 40 mm stroke and 207 mm body length suit it for small clamping fixtures where a tool can be mounted on both rod ends for sequential operations.
Is the Airtac SCD Standard Cylinder SCD50X40S the Right Cylinder?
Choose the SCD50X40S when you need a compact, sensor-ready cylinder with equal push and pull force. If your application requires more force, stepping up to the 63 mm bore provides 1402 N at the same pressure. For applications with a significant side load, a double-rod cylinder offers better guidance than a single-rod type, but a dedicated guided cylinder or external linear guide is still required for true moment load support. As a direct replacement, match the 50 mm bore, 40 mm stroke, PT port thread, and the integrated magnet feature.
Double-rod checklist
- ✓ Need equal force / speed both directions?
- ✓ Rear rod for tooling, stopper or sensor flag?
- ✓ Better rod guidance / anti-rotation?
- ✓ Port/thread type (PT/NPT/G)
- ✓ 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 Keep BOTH rod ends clear of side load and interference.
- check Adjust end cushion screws for smooth stops.
- check Use SCD mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCD Standard Cylinder SCD50X40S FAQ
Because it is a double-rod cylinder, the effective piston area is the same on both sides. It produces an equal force of 825 N when extending and retracting at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD50 when you need identical force and speed in both directions, or when you require a rear rod end to mount tooling, a stopper, or a sensor flag. The through-rod also provides superior bearing support and natural anti-rotation compared to a single-rod cylinder.
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