The AirTAC Airtac SCD Standard Cylinder SCD50X175S 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, 175mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X175S delivers identical push and pull force in both directions—825 N at 0.5 MPa—because the 20 mm rod passes through both end caps, subtracting the same area from each chamber. This 175 mm stroke double-rod unit is built with a 207 mm body length (A dimension) and PT1/4 ports, making it a compact solution for tasks that need a rear rod extension for tooling or flags.
A built-in magnet comes standard on this -S model, so you can clip CMSG, DMSG, or EMSG sensors directly onto the tie-rod barrel for end-of-stroke or mid-position sensing without extra brackets. The adjustable air cushion at each end (21 mm long) decelerates the piston smoothly, protecting the end caps during high-cycle operation.
| Model | Airtac SCD Standard Cylinder SCD50X175S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 175 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. |
| ×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.
The through-rod design lets you mount tooling on both ends of the SCD50X175S, shuttling parts between two stations with equal speed and force in each direction.
Use the rear rod extension as a clean target for the built-in magnet's sensors when the front rod is buried inside a fixture, keeping wiring accessible.
The dual-rod bearing support provides better resistance to twisting than a single-rod cylinder, making it suitable for pushing loads that tend to rotate.
Step up to the 63 mm bore SCD if you need more muscle—the SCD63 delivers 1402 N at 0.5 MPa. If your load is lighter and you only need actuation from one end, a single-rod SC50 cylinder reduces the rear overhang and simplifies mounting. For a direct replacement, match the 50 mm bore, 175 mm stroke, PT port thread, basic mounting, and the -S magnet option; an SCD50X175S from another source will drop in mechanically.
At 175 mm of stroke the rod is well supported, but if you later extend beyond 300 mm, watch for rod deflection under side load—add an external linear guide or switch to a guided cylinder for long unsupported reaches.
Double-rod checklist
Push and pull force are identical because it is a double-rod cylinder. At 0.5 MPa you get 825 N, at 0.7 MPa you get 1154 N, and at the maximum operating pressure of 0.9 MPa the force reaches 1484 N in both directions.
Choose the SCD when you need equal force and speed in both directions, a rear rod to mount a sensor flag or secondary tooling, or better rod guidance to resist rotation. If you only need to push from one end and want a shorter overall length, the single-rod SC series is a better fit.
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