The AirTAC Airtac SCD Standard Cylinder SCD50X120 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. Ø50mm bore, 120mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X120 is a double-acting, double-rod pneumatic cylinder that produces identical force in both directions—825 N at 0.5 MPa and up to 1484 N at 0.9 MPa—because the 20 mm rod passes through both end caps. This symmetry eliminates the force imbalance of a single-rod design, making the cylinder ideal for two-sided tooling, transfer mechanisms, and applications where a rear rod extension carries a sensor flag or secondary fixture.
With a 50 mm bore and a 120 mm standard stroke, the cylinder body length A(SCD) is 207 mm, and both rod ends feature an M16x1.5 thread. The adjustable air cushion on each end decelerates the piston smoothly over the final 21 mm of travel, protecting end-cap components at speeds up to 800 mm/s. Ports are PT1/4, and the tie-rod construction keeps the assembly serviceable.
| Model | Airtac SCD Standard Cylinder SCD50X120 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 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, 21 mm |
| Max stroke | Up to 1200 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 | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 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). |
|---|---|
| 50 | 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 lets one cylinder drive two opposing mechanisms simultaneously, such as opening and closing a pair of gripper jaws or shifting a dual-position stop gate with equal timing and force.
Attach a sensor flag or cam to the rear rod extension to trigger limit switches or position sensors without encroaching on the front working space, keeping the primary tooling area clear and accessible.
The dual-rod bearing support provides better resistance to rod rotation than a single-rod cylinder, making the SCD50X120 suitable for simple push-and-eject stations where a small flat pusher plate must stay aligned without a separate anti-rotate guide.
Choose the SCD50X120 when you need equal push and pull force from both rod ends. If your load requires more thrust, the SCD63 bore delivers 1402 N at 0.5 MPa; for a lighter, more compact installation, the SCD40 provides 528 N. This double-rod cylinder is the right pick over a single-rod SC when you must mount tooling or a stop on the rear rod, or when symmetric bearing loading extends seal life.
For direct replacement, match the 50 mm bore, 120 mm stroke, PT1/4 ports, and the basic mounting configuration. If you later add a magnet, order SCD50X120-S; for a centre-trunnion pivot, specify SCD50X120TC. At this 120 mm stroke, rod deflection under side load is minimal, but any off-axis force still requires an external guide rail—the through rod improves guidance but does not eliminate the need for a guided cylinder under true side loads.
Double-rod checklist
Because the 20 mm rod occupies area on both sides of the piston, push and pull forces are equal. At 0.5 MPa you get 825 N, at 0.7 MPa it is 1154 N, and at the maximum operating pressure of 0.9 MPa the force reaches 1484 N. The theoretical force at 1.0 MPa is 168 kgf.
Pick the SCD when you need to mount tooling, a stop, or a sensor target on the rear rod, or when you require perfectly equal speed and force in both directions. The double-rod design also shares the bearing load across two rod bushes, which can improve guidance and seal life compared to a single-rod cylinder in applications with frequent cycling.
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