The AirTAC Airtac SCD Standard Cylinder SCD125X900 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, 900mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X900 is a double-acting, double-rod pneumatic cylinder that provides identical thrust in both directions—5734 N at 0.5 MPa and up to 10321 N at 0.9 MPa—because the 32 mm rod passes through both end caps. This symmetry makes it ideal for long-stroke transfer systems where a tool or sensor flag must be mounted on the rear rod end.
With a 900 mm stroke and an ISO 6430 class tie-rod construction, the cylinder body measures 291 mm (dimension A) in the retracted position. The adjustable air cushion on each end is 28 mm long, helping to decelerate high-inertia loads smoothly before the end of travel.
| Model | Airtac SCD Standard Cylinder SCD125X900 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 900 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. |
| ×900 | 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 push-pull force of 5734 N at 0.5 MPa ensures a material transfer shuttle moves with the same speed and power in both directions, simplifying flow control and timing on a 900 mm travel.
Mount a pressing tool on the front rod and a stripper plate or confirmation sensor flag on the rear rod. The through-rod design keeps both ends perfectly synchronized without complex linkages.
A 900 mm stroke double-rod cylinder can operate a sorting gate from either end, with the rear rod providing a convenient manual override or position indicator for the control system.
This 125 mm bore SCD model sits between the 100 mm bore (3681 N at 0.5 MPa) and the 160 mm bore (9425 N at 0.5 MPa). If your application needs more force, stepping up to the 160 bore nearly doubles the output. For a 900 mm stroke, ensure the piston rod is adequately supported against side loads; a through-rod design improves guidance but external linear guides are recommended for offset loads. To replace an existing unit, match the bore, 900 mm stroke, PT port thread, and the specific SCD mounting accessory (basic, FA, LB, or TC).
Double-rod checklist
The push and pull forces are identical because the rod extends from both ends. At 0.5 MPa it is 5734 N, at 0.7 MPa it is 8028 N, and at the maximum operating pressure of 0.9 MPa it reaches 10321 N.
Choose the SCD when you need equal force and speed in both directions, or when you need to attach tooling, stops, or sensors to the rear of the cylinder. The through-rod also provides better bearing support than a single-rod design, reducing rod deflection on long strokes like 900 mm.
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