The AirTAC Airtac SCD Standard Cylinder SCD63X125STC 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.
The SCD63X125STC is a double-acting, double-rod pneumatic cylinder that outputs an identical 1402 N of thrust in both directions at 0.5 MPa, thanks to its balanced piston design. With a 20 mm rod extending from both end caps, this 63 mm bore unit provides symmetrical force and speed for tasks requiring tooling or sensing on the rear rod.
This specific model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and ships with a TC centre trunnion pivot (F-SC63TC plus TCM1 bracket) for applications where the cylinder body must swing. Its 125 mm stroke is cushioned by 28 mm of adjustable pneumatic damping at each end, and the body length A(SCD) is 210 mm.
| Model | Airtac SCD Standard Cylinder SCD63X125STC |
|---|---|
| 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.
| 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. |
| ×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.
The through-rod design allows a single SCD63X125STC to drive tooling on both ends simultaneously, such as clamping fixtures on opposite sides of a conveyor, with perfectly synchronized motion and equal 1402 N force.
With its TC centre trunnion mount, this cylinder can pivot to move a transfer shuttle between two positions. The rear rod is commonly used to trigger limit switches for end-of-stroke confirmation.
The dual-rod support provides superior guidance compared to a single-rod cylinder, making it suitable for pushing flat panels or plates where rod rotation must be minimized without a full external guide assembly.
Choose the SCD63 bore when your application needs around 1400 N of balanced push-pull force at standard plant pressure. If you require more thrust, the SCD80 delivers 2268 N at 0.5 MPa; for a lighter, more compact solution, the SCD50 provides 825 N. This double-rod design is ideal when you need to attach tooling, a stop, or a sensor flag to the rear rod, but if your load applies significant side force, pair the cylinder with an external guide or select a guided cylinder instead.
For a direct replacement, match the 63 mm bore, 125 mm stroke, PT port thread, TC centre trunnion mounting, and the integrated magnet (-S). If the stroke is extended beyond this model's 125 mm, ensure the rod is adequately supported to prevent bending under compressive loads.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 1402 N, at 0.7 MPa it's 1962 N, and at the maximum operating pressure of 0.9 MPa it reaches 2523 N in both directions.
Choose the SCD when you need equal force and speed in both directions, or when you require a rear rod extension to mount a sensor cam, a mechanical stop, or secondary tooling. The dual-rod design also improves bearing support and reduces piston rod rotation compared to a standard SC single-rod cylinder.
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