The AirTAC Airtac SCD Standard Cylinder SCD63X400S 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, 400mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X400S is a double-acting, double-rod pneumatic cylinder that outputs an identical 1402 N of force in both directions at 0.5 MPa, thanks to its through-rod design where the 20 mm rod subtracts the same area from each piston face. With a 400 mm stroke and a body length A of 210 mm, this model provides a long, guided linear motion with a rod protruding from both ends, ideal for applications needing a rear connection point for a sensor flag, stopper, or secondary tooling.
This -S variant includes a built-in magnet, allowing CMSG, DMSG, or EMSG reed and solid-state sensors to be clamped directly onto the barrel for non-contact position sensing. Operating on filtered air from 0.15 to 1.0 MPa, it features an adjustable air cushion (28 mm length) to decelerate the piston at stroke ends, and uses standard PT1/4 ports with an M16x1.5 rod thread.
| Model | Airtac SCD Standard Cylinder SCD63X400S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 400 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. |
| ×400 | 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 equal force and speed in both directions, combined with a rod at each end, allows a single SCD63X400S to drive a transfer shuttle between two stations, with tooling mounted on both the front and rear rods for balanced, synchronous movement.
The built-in magnet and protruding rear rod make it simple to mount a DMSG sensor on the barrel for end-of-stroke detection, while a cam or flag on the rear rod trips an external limit switch for a redundant, hard-wired home position signal.
With a rod supported by bearings in both end caps, the SCD63X400S offers better resistance to rod rotation than a single-rod cylinder, making it suitable for a long-stroke pusher where maintaining the orientation of a vacuum cup or gripper is critical.
Choose the SCD63 when the 1402 N force at 0.5 MPa fits your load; if you need more thrust, step up to the SCD80 bore which provides 2268 N at the same pressure. This double-rod cylinder is the right choice when you need equal push/pull force and a rear rod for dual-sided actuation, but if your application only requires force from one end, the single-rod SC63 series is a more compact and cost-effective alternative. For a drop-in replacement, match the 63 mm bore, 400 mm stroke, PT1/4 port thread, basic mounting, and the -S magnet option.
At a 400 mm stroke, the unsupported rod length on both ends increases the risk of side-load deflection. For horizontal or vertical moves with any off-axis load, use an external linear guide rail or switch to a guided cylinder assembly to protect the rod bearings and ensure long service life.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 1402 N, at 0.7 MPa it produces 1962 N, and at the maximum operating pressure of 0.9 MPa it delivers 2523 N in both directions.
Select the SCD when you need a rear rod for mounting a sensor flag, stopper, or secondary tooling, or when you require perfectly equal force and speed in both directions. The through-rod design also provides better guidance and anti-rotation than a single-rod cylinder, though it is not a substitute for a fully guided cylinder under heavy side loads.
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