The AirTAC Airtac SCD Standard Cylinder SCD50X275S 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, 275mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X275S is a double-acting, double-rod pneumatic cylinder where the piston rod extends from both ends, producing absolutely equal push and pull force of 825 N at 0.5 MPa (1484 N at 0.9 MPa). This symmetry, derived from the 20 mm rod subtracting the same area on both sides, makes it ideal for applications requiring balanced speed and thrust in both directions, such as operating a two-sided tool or a transfer mechanism.
This 50 mm bore model features a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. With a 275 mm stroke, it operates within the standard range for this bore (max 1200 mm) and includes adjustable pneumatic cushioning (21 mm length) for smooth deceleration, all within a body length of 207 mm (A dimension).
| Model | Airtac SCD Standard Cylinder SCD50X275S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 275 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. |
| ×275 | 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 825 N push-pull force at 0.5 MPa provides perfectly symmetrical motion for shuttling parts between two conveyor lines or workstations, where timing and force must be identical in each direction.
With the built-in magnet (-S), mount a DMSG sensor on the rear end of the barrel to detect piston position using the rear rod's movement, a clean solution when the front end is inaccessible or heavily tooled.
Use the front rod for a press tool and the rear rod for a stripper plate or equalizing linkage. The 1484 N thrust at 0.9 MPa is consistent from both ends, ensuring uniform operation.
Choose the SCD50 when you need the balanced force output of a double-rod design in a mid-range bore. If 825 N at 0.5 MPa is insufficient, stepping up to the SCD63 provides 1402 N at the same pressure. For applications where force is only needed in one direction, a single-rod SC series cylinder is a more economical choice. The through-rod provides better guidance than a single rod, but for high side loads, a guided cylinder is still required.
As a direct replacement, match this model to another AirTAC SCD50X275S, ensuring identical bore, 275 mm stroke, PT port thread, basic mounting, and the integrated magnet for sensor compatibility. For strokes of 275 mm and beyond, ensure the load is guided externally to prevent bending moment on the unsupported rear rod.
Double-rod checklist
The push and pull forces are identical because the rod passes through both ends. At 0.5 MPa it is 825 N, at 0.7 MPa it is 1154 N, and at the maximum operating pressure of 0.9 MPa it reaches 1484 N.
Choose the SCD when you need identical 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 also provides better support for the piston, reducing uneven bushing wear compared to a single-rod cylinder under the same conditions.
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