The AirTAC Airtac SCD Standard Cylinder SCD63X300S 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, 300mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X300S is a double-acting, double-rod pneumatic cylinder that delivers identical push and pull force of 1402 N at 0.5 MPa (2523 N at the 0.9 MPa maximum operating pressure), thanks to its 20 mm through-rod subtracting the same area from both piston faces. This 300 mm stroke model stays within the standard stroke range for the 63 bore, and the built-in magnet (-S suffix) lets you mount CMSG, DMSG, or EMSG reed or solid-state sensors directly on the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback.
With a body length A of 210 mm and an adjustable air cushion of 28 mm at each end, the SCD63X300S decelerates the piston smoothly before it contacts the end caps, reducing noise and impact energy. The PT1/4 port and M16x1.5 rod thread match standard AirTAC SCD63 tooling, and the through-rod design provides better bearing support than a single-rod cylinder of the same bore, making it a solid choice for applications where the rear rod extension carries a sensor flag, a mechanical stop, or secondary light tooling.
| Model | Airtac SCD Standard Cylinder SCD63X300S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 300 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. |
| ×300 | 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 push-pull force and rod extension on both ends make the SCD63X300S ideal for a reciprocating transfer table where a tooling plate is mounted on each rod end, moving parts between two stations with identical speed and thrust.
With the built-in -S magnet, a DMSG sensor can be clamped onto the rear tie-rod to detect the piston position from the back end, keeping the front rod area clear for tooling and eliminating the need for external flag brackets.
The through-rod design provides dual-bearing support that resists rod rotation better than a single-rod cylinder. Use the SCD63X300S as a non-rotating pusher in a light press or alignment fixture where the rod must not twist under load.
Step up to the SCD80 bore if your application needs more than 2268 N of force at 0.5 MPa; step down to SCD50 (825 N at 0.5 MPa) if the SCD63 is over-specified and you want to save air consumption. For a direct replacement, match bore (63), stroke (300), PT port thread, SCD mounting accessory (basic in this case), and the -S magnet option—this unit is a form-fit-function swap for any AirTAC SCD63X300S. Because the 300 mm stroke puts significant unsupported rod length outside each end cap, evaluate side loads carefully; if the rod will see any radial force, add an external linear guide or switch to a guided cylinder rather than relying on the through-rod alone to handle the bending moment.
Double-rod checklist
Because the 20 mm rod passes through both end caps, the effective piston area is identical on both sides. The push and pull force are equal: 1402 N at 0.5 MPa, 1962 N at 0.7 MPa, and 2523 N at the 0.9 MPa maximum operating pressure.
Pick the SCD when you need identical force and speed in both directions, or when you want to use the rear rod extension for mounting a sensor flag, a mechanical stop, or secondary light tooling. The through-rod also gives better bearing support and some resistance to rod rotation, though it is not a substitute for a fully guided cylinder under heavy side loads.
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