The AirTAC Airtac SCD Standard Cylinder SCD40X300 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, 300mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X300 is a double-acting, double-rod pneumatic cylinder that provides identical thrust in both directions—528 N at 0.5 MPa—because the 16 mm rod passes through both end caps. This 300 mm stroke model is built on a 191 mm body length (A dimension) and is frequently chosen for transfer stations or two-sided tooling where symmetric force and a rear rod connection point are needed.
With a 40 mm bore and PT1/4 ports, the cylinder cushions at both ends over a 21 mm stroke to decelerate the piston quietly. The through-rod design improves guidance compared to a single-rod cylinder of the same bore, though it does not replace a dedicated guided unit under significant side load. It operates on filtered air from 0.15 to 1.0 MPa and suits standard industrial temperatures of -20 to +70 °C.
| Model | Airtac SCD Standard Cylinder SCD40X300 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 300 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. |
| ×300 | 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 rear rod extension allows a single cylinder to drive tooling or a limit switch on both ends simultaneously, halving the number of actuators needed for a shuttle or transfer mechanism.
With a rod supported at both end caps, the SCD40X300 offers inherent anti-rotation stability for light pushing or ejecting tasks where a single-rod cylinder would twist under load.
The equal push/pull force of 528 N at 0.5 MPa makes this cylinder ideal for a 300 mm transfer table where the load mass and speed must be identical in both directions.
Step up to the SCD50 if your application needs more than 528 N at 0.5 MPa; the 50 mm bore delivers 825 N each way. For a simple push-only or pull-only task where only one rod end is used, the single-rod SC series is a more economical choice. If the 300 mm stroke introduces side-loading or bending risk on the unsupported rod, consider an external linear guide or a guided cylinder.
This SCD40X300 is a direct replacement for another AirTAC SCD double-rod cylinder of the same 40 mm bore, 300 mm stroke, PT port thread, basic mounting, and no magnet. Match all five points to guarantee identical form, fit, and function.
Double-rod checklist
Push and pull forces are identical on this double-rod cylinder. At 0.5 MPa you get 528 N, at 0.7 MPa it is 739 N, and at the maximum operating pressure of 0.9 MPa the output is 950 N. The theoretical force at 1.0 MPa is 108 kgf.
Choose the SCD when you need equal force and speed in both directions, a rear rod end for mounting a sensor flag or secondary tooling, or better rod guidance against rotation. If you only need force in one direction and want a lower-cost, more compact unit, the single-rod SC series is a better fit.
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