Airtac SCD Standard Cylinder SCD50X25
The AirTAC Airtac SCD Standard Cylinder SCD50X25 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.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke25 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD50X25
The SCD50X25 is a compact double-rod pneumatic cylinder that outputs an identical 825 N of thrust in both extend and retract at 0.5 MPa, thanks to its through-rod design. With a 20 mm rod projecting from both end caps and a short 25 mm stroke, it excels in tight spaces where a rear rod connection is needed for a sensor flag or dual-sided tooling.
This genuine AirTAC actuator uses a PT1/4 port and features an adjustable air cushion (21 mm) to softly decelerate the piston at each end of travel. Its tie-rod construction and symmetric rod loading provide better bearing support than a single-rod cylinder of the same size, reducing uneven wear during high-cycle tasks.
Airtac SCD Standard Cylinder SCD50X25 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD50X25 |
|---|---|
| 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.
Theoretical Output Force (Ø50mm, double rod)
| 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.
Model Code: Airtac SCD Standard Cylinder SCD50X25
| 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.
Where the Airtac SCD Standard Cylinder SCD50X25 Is Used
Reciprocating Transfer
The equal push-pull force and dual rod ends make it ideal for small shuttle tables where a workpiece is moved back and forth with consistent speed and power in both directions.
Rear Stroke Sensing
The rear rod extension provides a perfect mounting point for a sensor flag or cam, enabling end-of-stroke detection in tight envelopes where a barrel-mounted sensor may not fit.
Symmetric Clamping
Dual tooling plates can be mounted on both rod ends for a balanced, two-sided clamping fixture, applying equal force to two parts simultaneously from a single cylinder.
Is the Airtac SCD Standard Cylinder SCD50X25 the Right Cylinder?
Choose the SCD50X25 when you need equal bidirectional force in a very short stroke package. If 825 N at 0.5 MPa is insufficient, stepping up to the 63 mm bore SCD63 provides 1402 N each way, while the smaller 40 mm bore SCD40 delivers 528 N. For applications that only require a single working end, the standard SC single-rod cylinder is a simpler, more cost-effective alternative. To replace an existing SCD50X25, match the 50 mm bore, 25 mm stroke, PT port thread, and confirm whether the original unit carried a magnet or mounting accessory.
Double-rod checklist
- ✓ Need equal force / speed both directions?
- ✓ Rear rod for tooling, stopper or sensor flag?
- ✓ Better rod guidance / anti-rotation?
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Keep BOTH rod ends clear of side load and interference.
- check Adjust end cushion screws for smooth stops.
- check Use SCD mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCD Standard Cylinder SCD50X25 FAQ
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it produces 825 N, at 0.7 MPa it produces 1154 N, and at the maximum operating pressure of 0.9 MPa it delivers 1484 N in both directions.
Select an SCD double-rod cylinder when you need identical force and speed in both directions, or when you require a rear rod extension to mount tooling, a stopper, or a sensor flag. The through-rod also provides better guidance and anti-rotation characteristics than a single-rod cylinder, though it is not a replacement for a fully guided actuator under heavy side loads.
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