The AirTAC Airtac SCD Standard Cylinder SCD50X225S 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. Ø50mm bore, 225mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X225S is a double-acting, double-rod pneumatic cylinder delivering identical push and pull force of 825 N at 0.5 MPa (1484 N at 0.9 MPa). Its through-rod design, with a 20 mm rod extending from both ends, provides symmetric thrust and allows you to mount tooling, a mechanical stop, or a sensor flag on the rear rod. The built-in magnet (-S suffix) lets you clamp CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for precise, non-contact end-of-stroke detection.
This 50 mm bore model operates on filtered air from 0.15 to 1.0 MPa and features an adjustable pneumatic cushion (21 mm length) at both ends to decelerate the piston smoothly. With a body length A(SCD) of 207 mm, the unit is longer than a single-rod equivalent due to the rear rod extension. It uses PT1/4 ports and an M16x1.5 rod thread, making it a robust choice for two-sided actuation tasks where equal speed and force in both directions are critical.
| Model | Airtac SCD Standard Cylinder SCD50X225S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 225 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, 21 mm |
| Max stroke | Up to 1200 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 | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 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). |
|---|---|
| 50 | Bore size in mm. |
| ×225 | 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 provides equal push and pull force, ideal for operating tooling or clamps on both ends of the cylinder simultaneously without a complex linkage.
Use the rear rod extension to drive a secondary mechanism or flag a sensor, keeping the primary load path on the front rod perfectly synchronized for shuttle tables.
The dual-rod support offers better resistance to rotation than a single-rod cylinder, making it suitable for light pushing or lifting where the load must stay aligned.
Choose the SCD50 when you need balanced force in both directions without the complexity of a full guided assembly. At 0.5 MPa, the 825 N output is a step up from the SCD40 (528 N) and a step below the SCD63 (1402 N). If your load is one-sided, a single-rod SC50 cylinder is a simpler, more compact alternative. For applications with significant side loads, do not rely solely on the double-rod's improved bearing support—add an external guide rail or switch to a guided cylinder. This is a genuine AirTAC SCD50X225S, a direct replacement for any SCD50X225S unit matching the same bore, 225 mm stroke, PT port thread, basic mounting, and built-in magnet.
Double-rod checklist
Because the piston rod passes through both end caps, the effective pressure area is identical on both sides. The force is 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at the maximum operating pressure of 0.9 MPa, in both directions.
Select the SCD when you need to mount tooling or a sensor on the rear rod, require perfectly equal force and speed in both directions, or need the enhanced anti-rotation guidance the through-rod provides. If you only need force in one direction and want a more compact unit, the single-rod SC50 is a better fit.
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