The AirTAC Airtac SCD Standard Cylinder SCD40X75S 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, 75mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X75S is a double-acting, double-rod pneumatic cylinder that delivers identical force in both directions—528 N at 0.5 MPa—because the 16 mm rod passes through both end caps. This symmetry makes it ideal for applications where a tool or sensor flag must be mounted on the rear rod, or where consistent speed and thrust are required in each stroke.
With a 75 mm stroke and a compact body length A of 191 mm, this SCD model includes a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. The adjustable air cushion at each end (21 mm) decelerates the piston smoothly, protecting the end caps during high-cycle operation.
| Model | Airtac SCD Standard Cylinder SCD40X75S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 75 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. |
| ×75 | 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 16 mm rod extending from both ends allows a tool to be mounted on each side, such as a pusher block on the front and a stop or flag on the rear, with equal 528 N force applied in both directions.
The built-in magnet (-S) enables a CMSG or DMSG sensor to be placed on the rear barrel section, detecting the piston's position via the rear rod's movement without interfering with the front tooling.
Provides balanced push and pull for a small transfer shuttle, ensuring the carriage moves at a consistent speed in both directions without the thrust variation typical of a single-rod cylinder.
Choose the SCD40 when you need equal push and pull output, as the through-rod design eliminates the force imbalance of a single-rod cylinder. If your application requires more thrust, step up to the SCD50, which provides 825 N at the same 0.5 MPa. For applications that only need force in one direction, a single-rod SC series cylinder may be a more economical choice. This double-rod unit is not a guided cylinder; if the 75 mm stroke exposes the rod to side loads, add an external guide rail.
As a direct replacement, match the 40 mm bore, 75 mm stroke, PT port thread, basic mounting style, and the -S magnet option. The SCD40X75S is a genuine AirTAC component, designed for reliable drop-in replacement of an existing unit with the same specifications.
Double-rod checklist
The push and pull force are identical because the 16 mm rod occupies both sides of the piston. At 0.5 MPa, the force is 528 N; at 0.7 MPa it is 739 N; and at the maximum operating pressure of 0.9 MPa, it reaches 950 N.
A double-rod cylinder like the SCD40X75S provides equal force and speed in both directions, which is critical for symmetrical motion. The rear rod extension also serves as a convenient mounting point for a secondary tool, a mechanical stop, or a sensor target, and it improves rod bearing support compared to a cantilevered single rod.
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