The AirTAC Airtac SCD Standard Cylinder SCD40X500S 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, 500mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X500S delivers identical force in both directions, producing 528 N of push and pull at 0.7 MPa thanks to its through-rod design that subtracts the 16 mm rod area from both piston sides. This 500 mm stroke model includes a built-in magnet, allowing CMSG/DMSG sensors to clamp directly onto the tie-rod barrel for clean, non-contact end-of-stroke detection without external brackets.
With a body length A of 191 mm and a 21 mm adjustable air cushion on each end cap, this double-acting cylinder decelerates loads smoothly at both stroke extremes. The M12x1.25 rod threads on both ends let you mount tooling, a rear stopper bolt, or a secondary position flag on the back side, making it a practical choice when you need to actuate from both ends or guide the rod more evenly through the bearings.
| Model | Airtac SCD Standard Cylinder SCD40X500S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 500 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. |
| ×500 | 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.
With a rod extending from both ends, the SCD40X500S can push a pallet into position while the rear rod trips a confirmation sensor, giving you one clean 500 mm stroke with equal force in both directions.
The built-in magnet lets you mount CMSG reed switches on the barrel, but the rear rod also provides a perfect spot for a secondary mechanical flag or target, enabling redundant end-of-stroke verification on automated lines.
The through-rod design naturally resists piston rotation better than a single-rod cylinder. Use it in a simple press or alignment station where you need the tooling to stay square without adding an external anti-rotate guide.
For applications needing more thrust, the 50 mm bore SCD50 series steps up to 825 N at 0.5 MPa, while the 32 mm bore SCD32 offers a lighter 345 N if you can accept a smaller footprint. This SCD40X500S is the right pick when 528 N at 0.7 MPa is sufficient and you value the sensor-ready magnet. If your load applies significant side force, remember that the double rod improves guidance over a single-rod cylinder but does not replace a dedicated guided cylinder with external rails for heavy offset loads.
At a 500 mm stroke, ensure the unsupported rod is not subjected to bending moments; use an external guide or limit side loading. To replace an existing unit, match the 40 mm bore, 500 mm stroke, PT port thread, basic mounting style, and the -S magnet option to guarantee identical fit and sensor compatibility.
Double-rod checklist
Because the piston rod passes through both ends, the effective pressure area is identical for extension and retraction. 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 force reaches 950 N in both directions.
Choose the SCD when you need equal force and speed in both directions, want to mount tooling or a stop on the rear rod, or require better rod guidance to reduce bushing wear. The trade-off is a longer overall retracted length and slightly lower force than an SC of the same bore, since the rod area is subtracted from both sides.
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