The AirTAC Airtac SCD Standard Cylinder SCD50X25LB 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, 25mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X25LB is a compact double-rod pneumatic cylinder delivering identical force in both directions—825 N at 0.5 MPa—because the 20 mm rod passes through both end caps. With a short 25 mm stroke and LB foot mounting, it excels in tight spaces where a rigid, surface-mounted actuator must push or pull a fixture from either end.
This model's body length A(SCD) is 207 mm, and its adjustable air cushion (21 mm) decelerates the piston smoothly at each stroke end. The PT1/4 ports and M16x1.5 rod threads are standard on the 50 mm bore, making it a drop-in for many dual-tooling or transfer tasks that need symmetric thrust.
| Model | Airtac SCD Standard Cylinder SCD50X25LB |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 25 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. |
| ×25 | 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 lets you mount a gripper on the front and a counterbalance or second tool on the rear, moving both simultaneously with equal 825 N force.
The dual-rod support resists twisting better than a single rod, making it suitable for ejecting small parts squarely over a 25 mm stroke without adding external guides.
Mount a clamp on each rod end to grip a workpiece from both sides with exactly matched pressure, ideal for light assembly or testing stations.
Choose the SCD50 bore when your application needs around 825 N of force each way at standard plant pressure. If you require more thrust, the SCD63 bore steps up to 1402 N at 0.5 MPa. For purely single-sided work where a rear rod is unnecessary, the single-rod SC50 series is a simpler, lower-cost alternative. The LB foot mount (F-SC50LB) bolts directly to a machine bed and resists axial shifting.
To replace an existing SCD50 cylinder, match five points: 50 mm bore, 25 mm stroke, PT port thread, the LB foot mounting, and the absence of a magnet. This ensures the new unit drops into the same footprint and pneumatic circuit without modification.
Double-rod checklist
Push and pull forces are equal because the rod occupies both piston sides. At 0.5 MPa you get 825 N, at 0.7 MPa it is 1154 N, and at the maximum operating pressure of 0.9 MPa the force reaches 1484 N.
Choose SCD when you need identical force and speed in both directions, want to attach tooling or a sensor flag to the rear rod, or require the better rod guidance and anti-rotation that a through-rod design provides. If you only need force from one end, the SC single-rod series is usually more cost-effective.
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