The AirTAC Airtac SCD Standard Cylinder SCD50X250STC 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, 250mm stroke, PT1/4 ports and adjustable end cushioning.
This SCD50X250STC double-rod pneumatic cylinder provides an identical 825 N of force in both directions at 0.5 MPa, thanks to its through-rod design where the 20 mm rod subtracts the same area from each piston face. The 250 mm stroke is well within the bore's 1200 mm maximum, and the adjustable air cushion (21 mm) at each end decelerates the piston smoothly to reduce end-cap impact.
The built-in magnet (denoted by the -S suffix) lets you mount CMSG or DMSG sensors directly on the tie-rod barrel for contactless position sensing, while the TC centre trunnion mount (supplied with the TCM1 bracket, part F-SC50TC) allows the entire cylinder body to pivot, making it ideal for swinging or articulating loads. Both rods feature an M16x1.5 thread for attaching tooling on either side.
| Model | Airtac SCD Standard Cylinder SCD50X250STC |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 250 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. |
| ×250 | 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 250 mm stroke and equal force in both directions make this cylinder ideal for shuttling parts between two parallel conveyor lines, where tooling can be mounted on both rod ends for simultaneous loading and unloading.
The TC centre trunnion mount allows the SCD50X250STC to swing freely as it extends and retracts, perfect for operating a pivoting clamp arm or a toggle mechanism that needs balanced push and pull force from a moving cylinder body.
The dual 20 mm rods provide inherent anti-rotation guidance, making this cylinder a reliable choice for a long-stroke pusher or ejector where the tooling must not twist, without needing an external guide rail for light side loads.
With 825 N of balanced force at 0.5 MPa, the SCD50 suits symmetric push-pull tasks. If you need more thrust, the SCD63 bore steps up to 1402 N at the same pressure. For applications that only require force from one end, a single-rod SC50 cylinder provides a higher push force (942 N at 0.5 MPa) because the full bore area is used on the extend stroke. This SCD model is a direct replacement for another AirTAC SCD50X250 with matching PT ports, TC trunnion mount, and magnet; always verify the port thread and mounting accessory code when swapping units.
Double-rod checklist
Because the SCD is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it delivers 825 N, at 0.7 MPa it delivers 1154 N, and at the maximum operating pressure of 0.9 MPa it delivers 1484 N in both directions.
Choose the SCD when you need equal 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 and rod bearings than a single-rod design, reducing uneven wear, but it is not a substitute for a fully guided cylinder under heavy side loads.
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