The AirTAC Airtac SCD Standard Cylinder SCD50X85S 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, 85mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X85S is a double-acting, double-rod pneumatic cylinder that delivers exactly 825 N of thrust in both directions at 0.5 MPa, thanks to its symmetrical piston area. With a 20 mm rod extending from both ends and a body length A of 207 mm, it provides balanced force and a rear rod extension for mounting stroke sensors or auxiliary tooling.
This model includes a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. The adjustable air cushion at each end decelerates the 85 mm stroke smoothly, protecting end-cap components during high-cycle operation.
| Model | Airtac SCD Standard Cylinder SCD50X85S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 85 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. |
| ×85 | 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 push/pull force of 825 N at 0.5 MPa makes this cylinder ideal for shuttle tables where the load and speed must be identical in both travel directions.
The rear rod provides a perfect mounting point for a sensor flag or cam, while the built-in magnet on the piston allows barrel-mounted CMSG/DMSG sensors to confirm end-of-stroke position.
Use the front rod for the main tool and the rear rod for a counter-support or equalizing mechanism, ensuring the bearing load stays symmetric during clamping operations.
Choose the SCD50X85S when your application needs identical push and pull force and a rear rod for a sensor flag or secondary operation. If 825 N at 0.5 MPa is slightly low, stepping up to the 63 mm bore provides 1402 N at the same pressure. For a simpler setup where only one rod end is needed, the single-rod SC series is a lighter and more compact alternative. As a direct replacement, match the 50 mm bore, 85 mm stroke, PT port thread, basic mounting, and the -S magnet option to ensure identical form, fit, and function.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. 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 in both directions.
A double-rod cylinder provides equal force and speed in both directions and offers a rear rod extension. This rear rod is commonly used to mount external stroke sensors, cams, or a secondary tool, and it improves bearing guidance compared to a single-rod design, though it is not a replacement for a fully guided cylinder under high side loads.
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