The AirTAC Airtac SCD Standard Cylinder SCD100X55S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø25mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø100mm bore, 55mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD100X55S is a double-acting, double-rod pneumatic cylinder that produces identical force in both directions—3681 N at 0.5 MPa—because the 25 mm rod passes through both end caps. This model includes a built-in magnet (the -S suffix), allowing CMSG, DMSG, or EMSG reed and solid-state sensors to be mounted directly on the tie-rod barrel for clean, reliable end-of-stroke detection.
With a 55 mm stroke, it is well-suited for short-throw, two-sided tasks like clamping, ejecting, or operating a rear tooling flag. The body length A for the SCD100 is 263 mm, and the adjustable air cushion at each end (29 mm) decelerates the piston smoothly. It uses PT1/2 ports and an M20x1.5 rod thread, operating on 40 µm filtered air from 0.15 to 1.0 MPa.
| Model | Airtac SCD Standard Cylinder SCD100X55S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø100 mm |
| Rod diameter | Ø25 mm (both ends) |
| Stroke | 55 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M20×1.5 |
| 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, 29 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 | 3682 N | 3682 N |
| 0.7 MPa | 5154 N | 5154 N |
| Max (@1.0 MPa) | 751 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). |
|---|---|
| 100 | Bore size in mm. |
| ×55 | 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.
Operates a tool or clamp from both ends of the cylinder with equal force and speed, perfect for symmetrical assembly fixtures.
The rear rod extension carries a sensor flag or cam, while the front rod does the work. The built-in magnet enables direct barrel-mounted sensor detection.
The dual-rod design provides inherent anti-rotation for pushing or ejecting parts in a short, guided stroke without adding an external guide rail.
This 100 mm bore SCD suits applications needing around 3681 N of balanced force. If your load requires less thrust, stepping down to an SCD80 (2268 N at 0.5 MPa) can reduce air consumption and physical size. For applications where force is only needed in one direction and a rear rod is unnecessary, the single-rod SC series is a more compact and cost-effective choice. Remember that a double-rod cylinder provides better guidance than a single-rod type but is not a replacement for a guided cylinder under significant side loads.
For a drop-in replacement, match the 100 mm bore, 55 mm stroke, PT port thread, basic mounting, and the -S magnet option. This SCD100X55S is a direct replacement for an identical AirTAC SCD model with the same specifications.
Double-rod checklist
The push and pull forces are identical because it is a double-rod cylinder. At 0.5 MPa, it outputs 3681 N in both directions. At 0.7 MPa, the force is 5153 N, and at the maximum operating pressure of 0.9 MPa, it reaches 6626 N.
Choose an SCD when you need equal force and speed in both directions, or when you need to mount tooling, a stopper, or a sensor flag on the rear rod. The through-rod design also provides better support for the piston rod, reducing bushing wear compared to a single-rod cylinder in applications with minor side loads.
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