Airtac SCD Standard Cylinder SCD63X125
The AirTAC Airtac SCD Standard Cylinder SCD63X125 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, 125mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Rod (both ends)Ø20 mm
- Stroke125 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD63X125
The SCD63X125 is a double-acting pneumatic cylinder with a through-rod design, meaning the 20 mm piston rod extends from both ends of the 63 mm bore body. This configuration yields an identical effective piston area on each side, producing a balanced output of 1402 N in both the extend and retract directions when supplied with 0.5 MPa air pressure. The body length for this bore is 210 mm, providing a compact yet robust tie-rod construction for mid-range force applications.
With a 125 mm stroke, this model is well-suited for tasks requiring symmetric motion, such as operating two fixtures simultaneously or using the rear rod for mounting a sensor flag. The cylinder includes adjustable air cushioning with a 28 mm cushion length to decelerate the piston smoothly at both ends of travel. It operates on filtered air from 0.15 to 1.0 MPa, with a maximum theoretical force of 286 kgf at 1.0 MPa, and supports speeds from 30 to 800 mm/s.
Airtac SCD Standard Cylinder SCD63X125 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD63X125 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 125 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 SCD63X125
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 63 | Bore size in mm. |
| ×125 | 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 SCD63X125 Is Used
Bidirectional Clamping
The equal 1402 N force in both directions makes this cylinder ideal for clamping two workpieces simultaneously from opposite sides, ensuring uniform pressure without complex valving.
Non-Rotating Guide Bar
The dual 20 mm rods provide inherent anti-rotation stability, useful for simple press fits or stamping operations where a guided linear motion is needed without adding external rails.
Rear Stroke Sensing
Use the exposed rear rod to mount a target flag for external limit switches or a mechanical stop, allowing full-stroke position confirmation without placing sensors directly on the cylinder barrel.
Is the Airtac SCD Standard Cylinder SCD63X125 the Right Cylinder?
This 63 mm bore model generates 1402 N of force at 0.5 MPa, sitting between the smaller 50 mm bore (825 N) and the larger 80 mm bore (2268 N). Choose the SCD63 if you need more force than a 50 mm can provide but require the balanced output of a double-rod design. If your application only needs force in one direction, the single-rod SC63 series would be a more cost-effective choice, as it offers a higher push force on the full-bore side. For direct replacement, match the 63 mm bore, 125 mm stroke, PT port thread, and ensure any mounting accessories like FA or LB brackets are identical to the original SCD unit.
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 SCD63X125 FAQ
Because the rod passes through both ends, the push and pull forces are identical. At 0.5 MPa it outputs 1402 N, at 0.7 MPa it outputs 1962 N, and at the maximum operating pressure of 0.9 MPa it reaches 2523 N.
Choose the SCD when you need perfectly balanced force and speed in both directions, or when you require a rear rod extension to attach tooling, a cam, or a position sensor. The dual-rod design also offers better guidance and resistance to rod bending compared to a single-rod cylinder of the same bore.
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