The AirTAC Airtac SCD Standard Cylinder SCD40X80S 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, 80mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X80S delivers perfectly symmetrical force in both directions, generating 528 N of push and 528 N of pull when supplied with 0.5 MPa air. This balanced output comes from the 16 mm diameter rod passing through both end caps, subtracting the same area from each side of the piston. For a compact 80 mm stroke, the retracted body length is 191 mm, making it a tidy package for dual-sided tooling.
A built-in magnet is factory-installed in this -S variant, allowing CMSG, DMSG, or EMSG solid-state sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. The adjustable air cushion at each end, with a 21 mm cushion length, decelerates the piston smoothly without any metal-to-metal contact at the end of travel.
| Model | Airtac SCD Standard Cylinder SCD40X80S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 80 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. |
| ×80 | 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.
Operates a tool or clamp on the front rod end while the rear rod extension trips a limit switch or carries a counterbalance weight, all with equal speed and force.
The through-rod design provides superior guidance compared to a single-rod cylinder, helping to resist rotation in light pushing or sorting applications without a dedicated guide rail.
The built-in magnet allows a CMSG sensor to be placed on the rear barrel section, using the rear rod's movement to signal a home or fully-retracted position in a tight envelope.
Step up to the SCD50 if your application needs more muscle; its 20 mm rod and larger piston area provide 825 N of force each way at 0.5 MPa. If you only need force from one end, the single-rod SC40 is a simpler and more compact choice. For direct replacement, match the 40 mm bore, 80 mm stroke, PT1/4 port thread, and the SCD basic mounting style. The integrated magnet means your replacement must also carry the -S designation to keep your existing barrel-mounted sensors functional.
Double-rod checklist
Because the piston rod extends through both ends of the cylinder, the effective pressure area is identical in both directions. The output force is 528 N pushing and 528 N pulling at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need to mount tooling, flags, or stops on both ends of the rod, or when you require perfectly equal speed and force in both directions. The dual-rod support also offers better resistance to side-load moments than a single-rod cylinder, though it is not a replacement for a fully guided actuator under heavy side loads.
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