The AirTAC Airtac SCD Standard Cylinder SCD50X70 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, 70mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X70 double-rod pneumatic cylinder provides perfectly balanced bidirectional force, outputting 825 N in both extend and retract at 0.5 MPa thanks to its through-rod design. With a 20 mm rod protruding from both end caps, this 70 mm stroke unit is ideal for compact mechanisms where a rear rod connection point is needed for a sensor flag or secondary tooling.
Equipped with a PT1/4 port and an M16x1.5 rod thread, the cylinder body has an A-length of 207 mm. The adjustable air cushion at each end, with a 21 mm cushion length, effectively decelerates the piston near the stroke ends, protecting the end caps from impact in high-cycle applications.
| Model | Airtac SCD Standard Cylinder SCD50X70 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 70 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. |
| ×70 | 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 equal 825 N force in both directions makes this cylinder perfect for symmetrical clamping fixtures where the workpiece is engaged from two sides simultaneously.
The exposed rear rod provides a convenient mounting point for a sensor flag or cam, enabling end-of-stroke detection without attaching hardware to the main tooling plate.
With a rod guided through both end caps, the SCD50X70 offers enhanced resistance to rotation, making it suitable for simple push-and-eject tasks where a linear guide is not fully justified.
Choose the SCD50X70 when your application demands identical push and pull thrust in a compact stroke. If 825 N per direction is insufficient, stepping up to the 63 mm bore (SCD63) provides 1402 N at the same 0.5 MPa. For applications where only one rod end is needed, the single-rod SC series is a more cost-effective and compact alternative. To replace an existing SCD50X70, match the 50 mm bore, 70 mm stroke, PT port thread, basic mounting, and ensure the magnet option (-S) matches your sensor requirements.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. The effective piston area is the same on both sides. At 0.5 MPa it produces 825 N, at 0.7 MPa it produces 1154 N, and at the maximum operating pressure of 0.9 MPa it delivers 1484 N.
Select the SCD50X70 when you need a rear rod connection for tooling or sensing, or when you require perfectly equal force and speed in both directions. The through-rod also provides better guidance and anti-rotation than a single-rod cylinder, though it is not a substitute for a fully guided unit under significant side loads.
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