The AirTAC Airtac SCD Standard Cylinder SCD50X220 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, 220mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X220 is a double-acting, double-rod pneumatic cylinder that provides identical force in both directions—825 N at 0.5 MPa—because the 20 mm rod passes through both end caps. With a 220 mm stroke and a body length of 207 mm, it suits tasks needing a rear rod extension for mounting a sensor flag, stopper bolt, or secondary tooling.
Both piston rod ends share the M16x1.5 thread, and the adjustable air cushion (21 mm) decelerates the load smoothly at each stroke end. The PT1/4 ports and tie-rod construction make this a straightforward drop-in for symmetric push-pull fixtures where space exists on both sides of the cylinder.
| Model | Airtac SCD Standard Cylinder SCD50X220 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 220 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. |
| ×220 | 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 lets you attach tooling to both ends, performing a push operation on the forward stroke and a separate pull operation on the return stroke with equal force.
Mount a part carrier on the front rod and a counterbalance or second carrier on the rear rod for balanced, high-cycle transfer between two stations.
The dual-rod bearing support resists twisting better than a single-rod cylinder, making it suitable for light pushing and ejecting where a keyed rod is not required.
Step up to the 63 mm bore SCD63 if your application demands more than 1402 N at 0.5 MPa; step down to the 40 mm bore SCD40 for a lighter 528 N output. If you only need force from one end, the single-rod SC50 series saves rear clearance and cost. For direct replacement, match bore (50 mm), stroke (220 mm), PT port thread, and any SCD mounting accessory—this basic model has no magnet or bracket. At 220 mm stroke, rod deflection is minimal under pure axial loads, but if the rod carries a side load or the tooling is heavy, add an external linear guide rather than relying solely on the through-rod’s improved bearing support.
Double-rod checklist
Push and pull forces are equal because the rod occupies both sides of the piston. 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 in both directions.
Choose the SCD when you need a rear rod extension to mount sensors, stroke limiters, or secondary tooling, or when you require perfectly symmetrical force and speed in both directions. The through-rod also provides better guidance than a single-rod cylinder, though it is not a substitute for a fully guided actuator under significant side loads.
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