The AirTAC Airtac SCD Standard Cylinder SCD63X300STC 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, 300mm stroke, PT1/4 ports and adjustable end cushioning.
This SCD63X300STC double-rod cylinder delivers identical 1402 N thrust in both directions at 0.5 MPa, thanks to its through-rod design where the 20 mm rod area is subtracted from both piston faces. The 300 mm stroke, combined with the rear rod extension, makes it ideal for tasks requiring simultaneous tooling on both ends or a rear-mounted sensor flag for stroke confirmation.
The cylinder body measures 210 mm (A dimension) and features a 28 mm adjustable air cushion at each end cap to decelerate the piston smoothly. This specific model includes a built-in magnet (S suffix) for direct mounting of CMSG/DMSG sensors and a centre trunnion pivot (TC suffix) with the TCM1 bracket, allowing the entire actuator to swing as the load articulates.
| Model | Airtac SCD Standard Cylinder SCD63X300STC |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 300 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.
| 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.
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 63 | Bore size in mm. |
| ×300 | 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.
The rear rod actuates a secondary stopper or clamp while the front rod pushes the workpiece, synchronizing two operations with one valve and equal force in both directions.
With the built-in magnet, mount CMSG reed switches on the barrel to confirm end-of-stroke position, while the rear rod extension carries a mechanical flag for a redundant hard-limit switch.
The centre trunnion mount (TC) lets the cylinder body pivot freely, making it suitable for a press or clamp that must self-align while maintaining a consistent 2523 N of thrust at 0.9 MPa.
Choose this 63 mm bore when your application needs around 1400 N of balanced force each way. If you require more thrust, step up to the 80 mm bore (SCD80 series) which provides 2268 N at 0.5 MPa; for a lighter, more compact solution, the 50 mm bore (SCD50) offers 825 N. A double-rod cylinder is the correct choice over a single-rod SC when you need a rear rod for a stopper bolt, cam, or external guide, but remember that the long 300 mm stroke on an unsupported rod can create a bending moment under side load—use an external guide rail or switch to a guided cylinder if off-axis forces are present.
For direct replacement, match the 63 mm bore, 300 mm stroke, PT port thread, centre trunnion (TC) mounting with the F-SC63TC bracket, and the integrated magnet (-S) for sensor compatibility.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa you get 1402 N, at 0.7 MPa it is 1962 N, and at the maximum operating pressure of 0.9 MPa the force reaches 2523 N in both directions.
Choose the SCD when you need a rear rod extension to mount tooling, a cam, or a position flag. The through-rod also provides better bearing support and inherent anti-rotation compared to a single-rod cylinder, and it guarantees perfectly equal speed and force for the extend and retract strokes.
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