The AirTAC Airtac SCD Standard Cylinder SCD50X125 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, 125mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X125 is a 50 mm bore double-rod pneumatic cylinder providing a balanced 825 N of thrust in both directions at 0.5 MPa, thanks to its identical effective piston area on each side. With a 20 mm diameter rod protruding from both end caps and a 125 mm stroke, it is a natural fit for symmetrical transfer mechanisms and fixtures where tooling must be mounted on both ends of the rod.
This double-acting cylinder features an adjustable air cushion (21 mm length) at each end to decelerate the piston smoothly, protecting end-cap components. The body length for this SCD model is 207 mm, and it operates on filtered air from 0.15 to 1.0 MPa, with PT1/4 ports as standard.
| Model | Airtac SCD Standard Cylinder SCD50X125 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 125 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. |
| ×125 | 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 force and speed in both directions make the SCD50X125 ideal for shuttle tables that move parts between two stations, ensuring consistent cycle times regardless of travel direction.
With a rod extending from both ends, operators can mount a primary tool on the front and a counter-support or secondary stripper plate on the rear, simplifying complex tooling setups.
Use the rear rod to trigger a limit switch or valve, confirming the piston's position for a synchronized pressing or clamping operation without adding an external flag to the front tooling.
Select the SCD50X125 when your application requires identical push and pull forces from a compact tie-rod cylinder. If 825 N per stroke is insufficient, stepping up to the 63 mm bore SCD series provides 1402 N at the same 0.5 MPa pressure. Conversely, if the 50 mm bore's force exceeds your needs, the SCD40 delivers 528 N. For applications with significant side loading, a through-rod offers better guidance than a single-rod cylinder, but a dedicated guided cylinder with external rails is required for true high-moment loads. A direct replacement must match the 50 mm bore, 125 mm stroke, PT1/4 ports, and basic mounting configuration.
Double-rod checklist
Because the SCD is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa, it generates 825 N; at 0.7 MPa, 1154 N; and at the maximum operating pressure of 0.9 MPa, it delivers 1484 N in both directions.
Choose the SCD50 when you need perfectly equal force and speed in both directions, or when you require a rear rod extension for mounting sensors, cams, or additional tooling. The through-rod also provides better support for the piston, reducing uneven bushing wear compared to a single-rod cylinder under purely axial loads.
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