The AirTAC Airtac SCD Standard Cylinder SCD50X75 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, 75mm stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCD50X75 double-rod cylinder provides a symmetrical 825 N of force in both extend and retract at 0.5 MPa, thanks to its through-rod design that subtracts the Ø20 mm rod area from both piston sides. This makes it ideal for applications where identical speed and thrust are needed in each direction, such as dual-sided tooling or linked mechanisms.
With a 75 mm stroke and a body length A of 207 mm, this cylinder fits compact spaces while still offering the inherent anti-rotation and better bearing support of a double-rod configuration. The adjustable pneumatic cushion, with a 21 mm cushion length, decelerates the piston smoothly at both ends, and the PT1/4 ports ensure straightforward pneumatic connections.
| Model | Airtac SCD Standard Cylinder SCD50X75 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 75 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. |
| ×75 | 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.
Operates tooling or clamps on both ends of the cylinder simultaneously with equal force, perfect for symmetrical pressing or forming tasks.
The protruding rear rod provides a convenient mounting point for a sensor flag or cam, enabling stroke confirmation without consuming space on the primary tooling side.
The two widely spaced rod bearings offer enhanced resistance to rod rotation compared to a single-rod cylinder, useful for maintaining tool alignment.
When sizing, the SCD50 delivers 825 N at 0.5 MPa. If you need more force, stepping up to the SCD63 bore provides 1402 N under the same pressure. If your application only requires a working stroke from one end, the single-rod SC50 series is a more economical choice, but you lose the rear rod for mounting sensors or secondary tooling. For direct replacement, match the 50 mm bore, 75 mm stroke, PT port thread, and basic mounting configuration. Adding the -S magnet option allows for easy integration of CMSG/DMSG sensors for end-of-stroke detection on both rod ends.
Double-rod checklist
The push and pull force is identical at 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at the maximum operating pressure of 0.9 MPa. This is because the 20 mm piston rod passes through both end caps, so the effective piston area is the same on both sides.
Choose the SCD50 when you need equal speed and force in both directions, a rear rod extension for mounting a limit switch or secondary tool, or the improved bearing support that helps resist side loads and rod rotation. If you only need force from one end, the SC50 single-rod cylinder is a simpler and more cost-effective option.
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