The AirTAC Airtac SCD Standard Cylinder SCD40X650 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø16mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø40mm bore, 650mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X650 is a double-acting, double-rod pneumatic cylinder that provides identical force and speed in both directions, outputting 528 N of thrust each way at 0.5 MPa. Its 16 mm diameter piston rod extends from both ends, making it ideal for applications where tooling or position sensing must be mounted on the rear rod, or where symmetric loading of the bearings is required.
With a 650 mm stroke and a body length A(SCD) of 191 mm, this cylinder is well-suited for medium-reach transfer and dual-sided actuation tasks. The adjustable air cushion at each end, with a 21 mm cushion length, decelerates the piston smoothly, and the PT1/4 port thread ensures straightforward pneumatic connections.
| Model | Airtac SCD Standard Cylinder SCD40X650 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 650 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 | 528 N | 528 N |
| 0.7 MPa | 739 N | 739 N |
| Max (@1.0 MPa) | 108 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). |
|---|---|
| 40 | Bore size in mm. |
| ×650 | 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 528 N at 0.5 MPa makes this cylinder perfect for shuttling parts between two stations, where the same load is moved in both directions.
The through-rod design provides inherent anti-rotation, useful for pushing components into a fixture where rod twist cannot be tolerated, eliminating the need for an external guide in purely axial applications.
The rear rod extension offers a convenient mounting point for a sensor flag or a mechanical stop, allowing stroke-end detection on the back of the cylinder without interfering with the primary tooling.
This 40 mm bore model is a balanced choice for dual-sided tasks; if you need more force, the SCD50 delivers 825 N at the same 0.5 MPa pressure. For applications where force is only needed in one direction, a single-rod SC cylinder would be more cost-effective. To ensure a direct replacement, match the bore, 650 mm stroke, PT port thread, basic mounting, and the absence of a magnet.
At this 650 mm stroke, the unsupported rod length on each side becomes a consideration. For applications with any side load, pairing this cylinder with an external guide rail or selecting a guided cylinder is strongly recommended to prevent rod bending and premature seal wear.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 528 N, at 0.7 MPa it produces 739 N, and at the maximum operating pressure of 0.9 MPa it produces 950 N of thrust in both directions.
Choose the SCD when you need equal force and speed in both directions, want to mount tooling or a sensor on the rear rod, or require better guidance and anti-rotation than a single-rod cylinder provides. The dual-rod support reduces bearing load asymmetry, making it suitable for applications where rod deflection must be minimized.
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