The AirTAC Airtac SCD Standard Cylinder SCD63X120 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, 120mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X120 is a double-acting, double-rod pneumatic cylinder that provides identical force in both directions—1402 N at 0.5 MPa—because the 20 mm rod passes through both end caps. This symmetry eliminates force differentials, making it ideal for tasks where a rear rod extension carries a sensor flag or secondary tooling.
With a 120 mm stroke and a body length A(SCD) of 210 mm, this 63 mm bore cylinder fits compact two-sided actuation setups. The adjustable air cushion (28 mm length) decelerates the piston smoothly at both ends, and the PT1/4 ports ensure straightforward plumbing into standard pneumatic circuits.
| Model | Airtac SCD Standard Cylinder SCD63X120 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 120 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. |
| ×120 | 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 rod extending from both ends allows simultaneous work on two parallel stations, such as pressing a component on one side while ejecting a finished part on the other, all with equal 1402 N force.
Mount a DMSG magnetic sensor on the rear barrel section to detect the piston's position via the rear rod's motion, enabling precise end-of-stroke confirmation in automated sequences.
Use the SCD63X120 to push a pallet onto a conveyor with the front rod while the rear rod simultaneously pulls the next pallet into position, doubling the throughput of a linear transfer system.
Choose the SCD63X120 when you need equal push and pull thrust of 1402 N at 0.5 MPa. If your application demands more force, step up to the SCD80 bore, which provides 2268 N at the same pressure. For less force, the SCD50 bore delivers 825 N. This double-rod unit is the right pick over a single-rod SC when you require a rear rod extension for mounting a stroke sensor, a mechanical stop, or dual-sided tooling. However, if the load applies significant side force, pair the cylinder with an external guide rail or switch to a guided cylinder, as the through-rod design improves guidance but does not eliminate the need for proper side-load support. For direct replacement, match the 63 mm bore, 120 mm stroke, PT port thread, and basic mounting style.
Double-rod checklist
Because the 20 mm rod occupies both sides of the piston, the effective pressure area is identical for push and pull. 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.
Choose the SCD when you need a rear rod extension for mounting accessories like a sensor flag, a mechanical stop, or secondary tooling. It also provides better rod guidance and anti-rotation than a single-rod cylinder, though it still requires external guides for heavy side loads.
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