The AirTAC Airtac SCD Standard Cylinder SCD63X250S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø20mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø63mm bore, 250mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X250S provides identical 1402 N of force in both directions at 0.5 MPa, thanks to its through-rod design where the 20 mm rod extends from both end caps. This symmetry makes it ideal for applications that need a rear rod end for mounting a sensor flag, stopper bolt, or secondary tooling while the front rod does the primary work.
With a 250 mm stroke and a 28 mm adjustable air cushion, this double-acting cylinder decelerates the piston smoothly at each end of travel. The built-in magnet, denoted by the 'S' suffix, lets you clamp CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for non-contact position sensing, eliminating the need for external limit switches on the machine frame.
| Model | Airtac SCD Standard Cylinder SCD63X250S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 250 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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, 28 mm |
| Max stroke | Up to 1500 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 | 1402 N | 1402 N |
| 0.7 MPa | 1962 N | 1962 N |
| Max (@1.0 MPa) | 286 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). |
|---|---|
| 63 | Bore size in mm. |
| ×250 | 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.
Uses the front rod to push a workpiece into a fixture while the rear rod simultaneously retracts a locking pin, synchronizing two motions with one cylinder and equal force in both directions.
The built-in magnet on the SCD63X250S allows CMSG sensors to be mounted on the rear rod side of the barrel, detecting piston position in tight spaces where the front cap is inaccessible.
The dual-rod support provides enhanced anti-rotation, making it suitable for pushing components along a track where a single-rod cylinder's piston might twist and jam.
Choose the SCD63 bore when your application needs around 1400 N of balanced thrust at standard plant pressure. If you can work with less force, stepping down to the SCD50 (825 N at 0.5 MPa) saves space and air consumption. For tasks requiring more punch, the SCD80 delivers 2268 N at the same pressure. This double-rod unit is the right call when you need to mount tooling or a cam on the rear rod; if you only need force from one end, the simpler single-rod SC63 is a better fit. For a like-for-like replacement, match the 63 mm bore, 250 mm stroke, PT port thread, basic mounting, and the -S magnet option. At this 250 mm stroke, the dual-rod support provides better inherent guidance than a single-rod cylinder, but if the load applies a significant side force, pair it with an external guide rail or switch to a dedicated guided cylinder.
Double-rod checklist
Because the 20 mm piston rod passes through both ends of the cylinder, the effective pressure area is identical for extension and retraction. The force is 1402 N at 0.5 MPa, 1962 N at 0.7 MPa, and 2523 N at the maximum operating pressure of 0.9 MPa.
Pick an SCD when you need the piston rod to perform work on both ends of the cylinder, such as driving a tool on one side and triggering a limit switch on the other. The through-rod also provides better guidance and bending moment resistance than a single-rod SC, though it is not a substitute for a fully guided cylinder under heavy side loads.
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