Airtac SCD Standard Cylinder SCD63X250STC
The AirTAC Airtac SCD Standard Cylinder SCD63X250STC 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, 250mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Rod (both ends)Ø20 mm
- Stroke250 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD63X250STC
The SCD63X250STC delivers identical force in both directions, producing 1402 N of thrust at 0.5 MPa whether extending or retracting. This symmetry comes from the 20 mm through-rod that exits both end caps, subtracting the same area from each piston face. With a 250 mm stroke and a 210 mm body length, the assembly is well-suited for transfer mechanisms where a rear rod extension can carry a sensor flag or secondary tooling without adding a separate actuator.
Equipped with a built-in magnet and a centre trunnion mount, this model is ready for pivoting applications that require mid-body support. The integrated magnet allows CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for clean, external position sensing. Adjustable pneumatic cushioning at both ends decelerates the 28 mm cushion stroke smoothly, protecting the end caps during high-cycle operation.
Airtac SCD Standard Cylinder SCD63X250STC Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD63X250STC |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 250 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 SCD63X250STC
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 63 | Bore size in mm. |
| ×250 | 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 SCD63X250STC Is Used
Bidirectional Transfer Shuttles
The equal push/pull force of 2523 N at 0.9 MPa makes this cylinder ideal for shuttle tables that move a fixture between two stations. The rear rod can carry a counterbalance or a secondary limit switch dog.
Sensed Pivoting Actuators
With the built-in magnet and TC centre trunnion mount, this unit pivots smoothly under load while barrel-mounted sensors provide end-of-stroke confirmation. Common on bin-tippers and dump mechanisms.
Dual-Sided Tooling Press
Mount a forming tool on the front rod and an ejector pin on the rear rod. Both tools actuate with the same 1402 N force at 0.5 MPa, simplifying the pneumatic circuit and control logic.
Is the Airtac SCD Standard Cylinder SCD63X250STC the Right Cylinder?
This 63 mm bore double-rod cylinder suits applications needing balanced bidirectional force around 1400 N at standard plant pressure. If your load requires more thrust, the SCD80 bore steps up to 2268 N at 0.5 MPa; for a lighter, more compact solution, the SCD50 provides 825 N. Choose this SCD over a single-rod SC when you need a rear rod end for mounting a stop, flag, or secondary tool, or when equal speed in both directions is critical.
For a 250 mm stroke, ensure the load is guided externally if any significant side force is present—the through-rod improves bearing support compared to a single-rod design but does not eliminate the need for external guidance on long strokes. As a direct replacement, match the 63 mm bore, 250 mm stroke, PT port thread, centre trunnion (TC) mounting, and the -S magnet suffix to an identical AirTAC SCD part number.
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 SCD63X250STC FAQ
Because the 20 mm rod passes through both sides of the piston, the effective pressure area is identical in both directions. The force is 1402 N at 0.5 MPa, 1962 N at 0.7 MPa, and 2523 N at the maximum operating pressure of 0.9 MPa.
Select the SCD when you need a rod extension on the rear cap for mounting sensors, stops, or secondary tooling, or when your process demands perfectly equal speed and force in both directions. The through-rod also provides better support for the piston, reducing uneven bushing wear compared to a single-rod cylinder under the same conditions.
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