The AirTAC Airtac SCD Standard Cylinder SCD40X700S 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, 700mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X700S is a double-acting, double-rod pneumatic cylinder that produces identical push and pull force because the 16 mm rod passes through both end caps. At 0.5 MPa it delivers 528 N in each direction, giving designers predictable, balanced motion for tooling mounted on either end of the through-rod. The 700 mm stroke is well within the 1200 mm maximum for this 40 mm bore, and the adjustable air cushion (21 mm length) decelerates the piston smoothly at both ends of travel.
This model carries the -S suffix, so a magnet is built into the piston. You can clamp CMSG, DMSG, or EMSG reed or solid-state sensors directly onto the tie-rod barrel to detect end-of-stroke or mid-stroke positions without external flags. The body length A(SCD) is 191 mm, making the overall retracted length longer than a single-rod SC of the same stroke because the rear rod protrudes. Ports are PT1/4 with an M12x1.25 rod thread.
| Model | Airtac SCD Standard Cylinder SCD40X700S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 700 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. |
| ×700 | 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 through-rod lets you mount a tooling plate on both ends, moving parts between two parallel conveyor lines with equal speed and force in each direction.
With the built-in -S magnet, a DMSG sensor on the rear barrel detects the retracted position directly, even when the front end is enclosed or hard to access.
The dual-rod support provides inherent anti-rotation, making it suitable for pushing ejector plates or alignment pins where a single rod might twist under load.
Choose the SCD40 when you need the 528 N balanced force at 0.5 MPa. If your load requires more thrust, step up to the SCD50 bore, which provides 825 N at the same pressure. For applications that only need force from one end, the single-rod SC series is a lighter, more compact alternative. The double-rod design gives better rod guidance than a single-rod cylinder, but for true side-load resistance, a guided cylinder with external rails is the correct choice.
At a 700 mm stroke, the unsupported rod length on both ends is significant. Ensure the load is guided externally or that the rod is not subjected to bending moments, especially when the piston is fully extended. To replace an existing SCD40X700S, match the 40 mm bore, 700 mm stroke, PT1/4 ports, basic mounting, and the -S magnet option exactly.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it outputs 528 N, at 0.7 MPa it is 739 N, and at the maximum operating pressure of 0.9 MPa it reaches 950 N.
Pick the SCD when you need to attach tooling or a stop to the rear rod, require identical speed and force in both directions, or want the better bearing support and anti-rotation a through-rod provides. If you only need force from the front rod, the single-rod SC is more cost-effective.
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