The AirTAC Airtac SCD Standard Cylinder SCD125X300 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø32mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø125mm bore, 300mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X300 is a double-acting, double-rod pneumatic cylinder built for applications that demand identical force and speed in both directions. With a 125 mm bore and a 32 mm rod extending from both ends, it provides a balanced 5734 N of thrust each way at 0.5 MPa, rising to 10321 N at the maximum operating pressure of 0.9 MPa. This symmetry eliminates the force differential of a single-rod cylinder, making it ideal for two-sided tooling or processes requiring a rear rod for stroke confirmation.
This ISO 6430 class tie-rod cylinder features a 300 mm stroke and an adjustable air cushion of 28 mm at each end for smooth deceleration. The body length A(SCD) is 291 mm, and the rear rod adds to the overall retracted length. The PT1/2 ports and M27x2 rod thread handle high flow rates, while the speed range of 30-500 mm/s suits controlled industrial motions. The through rod improves guidance and resistance to rotation compared to a single-rod design, though external guides are still needed for heavy side loads.
| Model | Airtac SCD Standard Cylinder SCD125X300 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 300 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| 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 – 500 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | 8027 N |
| Max (@1.0 MPa) | 1169 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). |
|---|---|
| 125 | 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 5734 N force in both directions moves transfer shuttles with perfect symmetry, ensuring consistent cycle times regardless of travel direction.
The protruding rear rod provides a convenient mounting point for a target flag, allowing external CMSG sensors to confirm full retraction without occupying space on the front tooling.
Operates two opposing clamp arms from a single cylinder body, applying equal pressure on both sides of a workpiece for balanced holding in welding or assembly jigs.
Choose the SCD125X300 when you need a robust, balanced-force actuator for tooling on both ends or a rear-mounted sensor flag. If your force requirement is lower, the SCD100 bore provides 3681 N at 0.5 MPa, which may allow a smaller footprint. For higher forces, the SCD160 bore steps up to 9425 N. If your application only requires a single working end, the single-rod SC125X300 offers a higher push force from the full piston area, though the pull force will be significantly lower. For direct replacement, match the 125 mm bore, 300 mm stroke, PT1/2 ports, and basic mounting. The 300 mm stroke on this long cylinder requires careful alignment and may need an external guide to prevent rod bending under side loads.
Double-rod checklist
Because the piston rod passes through both ends of the cylinder, the effective pressure area is identical for both directions. The force is 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and 10321 N at 0.9 MPa for both the extend and retract strokes.
Choose the SCD when you need equal force and speed in both directions, or when you require a rear rod end for mounting sensors, stoppers, or secondary tooling. The through rod also provides better bearing support and inherent anti-rotation compared to a single-rod cylinder.
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