The AirTAC Airtac SCD Standard Cylinder SCD50X450H 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, 450mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X450H is a double-acting, double-rod pneumatic cylinder that produces exactly 825 N of force in both directions at 0.5 MPa, thanks to its symmetrical piston area. The 20 mm diameter rod extends from both ends, making it ideal for tasks where you need to mount tooling or a sensor flag on the rear side of the machine.
This model is fitted with high-temperature Viton (FKM) seals, extending its operating range to 0–150 °C and making it suitable for hot or aggressive environments where standard polyurethane would degrade. With a 450 mm stroke, an adjustable air cushion of 21 mm at each end, and a body length of 207 mm, it provides smooth deceleration for consistent bi-directional motion.
| Model | Airtac SCD Standard Cylinder SCD50X450H |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 450 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. |
| ×450 | 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 push and pull force moves a shuttle table consistently in both directions, with the rear rod available to trigger limit switches for end-of-stroke confirmation.
Viton seals allow this cylinder to operate reliably up to 150 °C, making it suitable for pushing parts through a drying oven or a heated forming station where standard seals would fail.
The through-rod design lets you mount identical tooling on both ends, performing work on two parallel lines with a single cylinder, ensuring perfectly synchronized motion.
Choose the SCD50 bore when your application needs around 825 N of force at standard plant pressure. If you require more thrust, stepping up to the SCD63 bore provides 1402 N at the same 0.5 MPa. For purely single-sided push tasks, a single-rod SC cylinder may be more cost-effective, but you lose the rear rod access and the inherently equal force profile. This double-rod design offers better guidance than a single-rod unit, but for significant side loads, a guided cylinder is still the correct choice.
For a drop-in replacement, match the 50 mm bore, 450 mm stroke, PT port thread, basic mount, and the Viton seal designation. At this 450 mm stroke, ensure the rear rod extension is supported if it carries any mass, or consider an external guide to prevent rod bending under asymmetric loads.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it provides 825 N, at 0.7 MPa it delivers 1154 N, and at the maximum operating pressure of 0.9 MPa it reaches 1484 N in both directions.
You choose an SCD when you need a rear rod extension for mounting sensors, cams, or additional tooling, or when you require perfectly equal force and speed in both directions. The through-rod also provides better support for the piston, reducing uneven bushing wear compared to a single-rod cylinder.
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