Airtac SCD Standard Cylinder SCD50X400S
The AirTAC Airtac SCD Standard Cylinder SCD50X400S 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, 400mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke400 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD50X400S
The SCD50X400S is a double-acting, double-rod pneumatic cylinder that outputs an identical 825 N of thrust in both extend and retract directions when supplied with 0.5 MPa air. Because the 20 mm rod passes through both end caps, the effective piston area is the same on each side, giving machinery designers perfectly balanced force and speed for two-sided tooling or linked mechanisms.
This model includes a built-in magnet (the -S suffix), so CMSG, DMSG, or EMSG reed and solid-state sensors can be clamped directly onto the tie-rod barrel for non-contact end-of-stroke or mid-stroke position feedback. With a 400 mm stroke, the 50 mm bore body has an A(SCD) dimension of 207 mm, and the adjustable air cushion at each end is 21 mm long to decelerate the piston quietly.
Airtac SCD Standard Cylinder SCD50X400S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD50X400S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 400 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 SCD50X400S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 SCD50X400S Is Used
Two-Sided Actuation
Operates a tool or clamp on the front rod end while the rear rod end simultaneously triggers a limit switch or drives a secondary linkage, all with equal force.
Transfer Shuttle
Pushes a workpiece carrier in one direction and pulls it back with the identical 825 N force, ensuring smooth, symmetrical motion on a linear transfer line.
Anti-Rotation Pusher
The dual-rod support naturally resists rod rotation better than a single-rod cylinder, making it suitable for pushing applications where the tooling must stay aligned without an external guide.
Is the Airtac SCD Standard Cylinder SCD50X400S the Right Cylinder?
Choose the SCD50 bore when your application needs around 825 N of force each way at standard plant pressure. If you require more thrust, stepping up to the 63 mm bore provides 1402 N at the same 0.5 MPa. For applications that only need force in one direction, the single-rod SC50 series is a more compact and cost-effective alternative, as it does not have the rear rod extension.
For a direct replacement, match the 50 mm bore, 400 mm stroke, PT port thread, and the -S magnet option. This SCD cylinder uses a basic mount; if you need a pivoting mount, consider the TC centre trunnion. At this 400 mm stroke length, ensure the load is guided externally if side forces are present, as the through-rod provides better bearing support than a single rod but is not designed to absorb high lateral loads.
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 SCD50X400S FAQ
The push and pull forces are identical on a double-rod cylinder. At 0.5 MPa it produces 825 N, at 0.7 MPa it is 1154 N, and at the maximum operating pressure of 0.9 MPa it reaches 1484 N in both directions.
Choose the SCD when you need the piston rod to do work on both ends of the cylinder, require perfectly equal force and speed in both directions, or want the improved rod guidance and anti-rotation characteristics that a through-rod design provides.
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