The AirTAC Airtac SCD Standard Cylinder SCD63X56S 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, 56mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X56S delivers identical force in both directions—1402 N at 0.5 MPa and up to 2523 N at 0.9 MPa—because the 20 mm rod passes through both end caps. This symmetric output makes it a natural fit for fixtures where a rear rod extension carries a sensor flag or secondary tooling, keeping the stroke compact at 56 mm.
A built-in magnet lets you clamp CMSG, DMSG, or EMSG sensors directly onto the tie-rod barrel for end-of-stroke or mid-position detection. With a body length of 210 mm and an adjustable air cushion of 28 mm, the cylinder decelerates the piston smoothly at both ends, protecting the end caps during repetitive short-stroke cycling.
| Model | Airtac SCD Standard Cylinder SCD63X56S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 56 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. |
| ×56 | 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 design lets you mount a gripper on the front and a counterbalance or second tool on the rear, moving both simultaneously with equal force.
The integrated magnet (-S) works with CMSG/DMSG sensors to confirm extend and retract positions, ideal for pick-and-place sequences that require position verification.
With the rod supported at both ends, the assembly resists rotation better than a single-rod cylinder, helping maintain alignment when pushing a part onto a locating pin.
For slightly lower force, the 50 mm bore SCD50 series provides 825 N at 0.5 MPa; stepping up to 80 mm bore jumps output to 2268 N. If your application only needs force from one end, a single-rod SC63 cylinder may reduce cost and overall length. This SCD63X56S is a direct replacement for any AirTAC SCD63 of the same stroke, PT port, and basic mounting, provided the original also carried the -S magnet option.
At 56 mm stroke, rod bending is rarely a concern, but always centre the load on the rod axis. For true side-load capability, switch to a guided cylinder rather than relying on the through-rod alone.
Double-rod checklist
Push and pull forces are identical because the rod area is subtracted on both sides. At 0.5 MPa you get 1402 N; at 0.7 MPa it is 1962 N; and at the maximum operating pressure of 0.9 MPa the force reaches 2523 N.
Choose the SCD when you need equal force and speed in both directions, or when you want to use the rear rod extension for mounting a sensor target, a stroke limiter, or secondary tooling. The dual-rod support also provides better guidance than a single rod, though it is not a substitute for a fully guided cylinder under side loads.
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