The AirTAC Airtac SCD Standard Cylinder SCD250X175S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø50mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø250mm bore, 175mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X175S is a large-bore double-rod pneumatic cylinder engineered for heavy-duty applications where precisely equal force and speed are required in both directions. At 0.5 MPa, it provides a substantial 23562 N of thrust on both the extend and retract strokes, a capability derived from its dual 50 mm diameter rods that ensure identical effective piston areas on each side. This model features a standard 175 mm stroke and a built-in magnet (denoted by the 'S' suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for reliable, non-contact position feedback.
Built on a robust tie-rod construction with a 1-inch PT port and an M42x2 rod thread, this cylinder is designed for demanding industrial environments. The adjustable air cushion at each end, with a 40 mm cushion length, provides smooth deceleration for high-inertia loads, protecting the end caps and reducing noise. With a substantial body length A(SCD) of 435 mm, it offers excellent rod guidance, though external guides are recommended for significant side loads. This unit is configured with the default TPU seal and PT threads, operating in a standard temperature range of -20 to +70 °C.
| Model | Airtac SCD Standard Cylinder SCD250X175S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 175 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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, 40 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 | 23562 N | 23562 N |
| 0.7 MPa | 32987 N | 32987 N |
| Max (@1.0 MPa) | 4805 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). |
|---|---|
| 250 | Bore size in mm. |
| ×175 | 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.
Provides perfectly balanced, high-force lifting and lowering on both sides of a scissor lift mechanism, using the rear rod for a counterbalance or secondary safety stop.
Pushes a steel plate onto a conveyor and then pulls a locating jig back with equal 23562 N force, ensuring a smooth, synchronized motion for heavy material handling.
Applies identical force on both the pressing and retraction strokes of a large compression fixture, with the rear rod driving a stripping plate to remove the finished part.
Selecting the SCD250X175S means choosing a cylinder for its unique ability to deliver identical, high-force output at both ends of the stroke, ideal for pushing and pulling a large load with perfect symmetry. If your application requires less force, the next bore down, the SCD200, provides 15080 N at the same 0.5 MPa pressure, which may offer a more cost-effective and compact solution. This double-rod design is the correct choice when you need to attach tooling or a stopper to the rear rod, or when the inherent anti-rotation properties of the through-rod are required; for a simpler push-only task, a single-rod SC cylinder would be a more economical fit.
For a direct replacement, match this model to another AirTAC SCD cylinder with an identical 250 mm bore, 175 mm stroke, 1-inch PT port, and the -S magnet option. The 175 mm stroke is well within the standard range, but for any stroke over 300 mm on a cylinder of this size, you must carefully evaluate the potential for rod bending under compressive load. In such cases, always consider an external guide rail or a dedicated guided cylinder assembly to prevent rod damage and ensure long service life.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. The force is 23562 N at 0.5 MPa, 32987 N at 0.7 MPa, and 42412 N at the maximum operating pressure of 0.9 MPa. The theoretical force at 1.0 MPa is 4805 kgf.
Choose the SCD when you need perfectly equal force and speed in both directions, which a single-rod cylinder cannot provide. The through-rod design also gives you a second working end for mounting tooling, cams, or external sensors, and it offers better resistance to rod rotation than a single-rod cylinder, making it ideal for applications requiring guided, symmetrical motion.
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