Airtac SCD Standard Cylinder SCD63X400
The AirTAC Airtac SCD Standard Cylinder SCD63X400 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. Ø63mm bore, 400mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Rod (both ends)Ø20 mm
- Stroke400 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD63X400
The SCD63X400 is a double-acting, double-rod pneumatic cylinder that outputs identical force in both directions because the 20 mm piston rod extends through both end caps. At a common 0.5 MPa supply, this 63 mm bore actuator provides 1402 N of thrust each way, making motion symmetrical and predictable for tooling mounted on either end.
With a 400 mm stroke and an adjustable air cushion of 28 mm at each end, the cylinder decelerates the piston smoothly without external shock absorbers. The body length A(SCD) is 210 mm, and the retracted overall length is longer than a single-rod SC of the same stroke due to the rear rod extension. It operates on 40 µm filtered air from 0.15 to 1.0 MPa and reaches 2523 N of force at the maximum 0.9 MPa working pressure.
Airtac SCD Standard Cylinder SCD63X400 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD63X400 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 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, 28 mm |
| Max stroke | Up to 1500 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 (Ø63mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1402 N | 1402 N |
| 0.7 MPa | 1962 N | 1962 N |
| Max (@1.0 MPa) | 286 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 SCD63X400
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 63 | 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 SCD63X400 Is Used
Two-Sided Transfer Shuttles
Mount a workpiece fixture on each rod end to shuttle parts between two stations with equal force and speed in both directions, halving cycle time.
Synchronized Pressing
Use the rear rod extension to drive a secondary linkage or stripper plate, mechanically synchronized with the main tool without extra valves.
Non-Rotating Pusher Axis
The dual-rod support provides inherent anti-rotation stability for a 400 mm push stroke, guiding a long pusher bar without a separate rail.
Is the Airtac SCD Standard Cylinder SCD63X400 the Right Cylinder?
Choose the SCD63X400 when you need a balanced 1402 N output at 0.5 MPa on both the extend and retract strokes. If your load requires more force, stepping up to the 80 mm bore SCD80 delivers 2268 N at the same pressure, while the smaller 50 mm bore SCD50 provides 825 N for lighter, more compact installations. For applications that only need thrust from one side, the single-rod SC63 series is a simpler and more cost-effective choice.
At a 400 mm stroke, the unsupported rod length on a double-rod cylinder is effectively doubled compared to a single-rod unit of the same stroke. If the application imposes any side load, consider adding an external linear guide or switching to a guided cylinder to prevent rod deflection and premature bearing wear. To replace an existing SCD63X400, match the 63 mm bore, 400 mm stroke, PT port thread, basic mounting style, and confirm whether the original carried the -S magnet option.
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 SCD63X400 FAQ
Because the rod passes through both ends, the effective piston area is identical for push and pull. The force is 1402 N at 0.5 MPa, 1962 N at 0.7 MPa, and reaches 2523 N at the maximum operating pressure of 0.9 MPa.
Pick the SCD63 when you need equal force and speed in both directions, or when you need a rear rod extension to mount a sensor flag, a mechanical stop, or secondary tooling. The through-rod design also provides better guidance against side load than a single-rod cylinder, though it is not a substitute for a fully guided actuator under heavy moment loads.
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