Airtac SCD Standard Cylinder SCD50X125TC
The AirTAC Airtac SCD Standard Cylinder SCD50X125TC 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, 125mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke125 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD50X125TC
The SCD50X125TC is a double-acting, double-rod pneumatic cylinder that outputs identical force in both directions—825 N at 0.5 MPa—because the 20 mm rod passes through both end caps. This symmetry is ideal for applications where a rear rod extension carries a sensor flag, a mechanical stop, or secondary tooling, ensuring balanced bearing loads and consistent speed on every cycle.
This model is configured with a TC centre trunnion mount (supplied with the TCM1 bracket, order code F-SC50TC), allowing the cylinder body to pivot during operation for swinging or articulating loads. With a 125 mm stroke and an adjustable air cushion of 21 mm at each end, it provides smooth deceleration without the need for external shock absorbers in moderate-speed applications.
Airtac SCD Standard Cylinder SCD50X125TC Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD50X125TC |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 125 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 SCD50X125TC
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×125 | 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 SCD50X125TC Is Used
Reciprocating Transfer Shuttles
The equal push-pull force moves a shuttle table or transfer carriage with the same speed and thrust in both directions, simplifying flow control and timing.
Rear-Mounted Stroke Sensing
The rear rod extension provides a clean mounting point for a sensor flag or cam, allowing end-of-stroke detection without interfering with the front tooling or workpiece.
Dual-Sided Actuation
Mount tooling on both rod ends to perform two operations in one cycle—such as pressing a bushing from one side while a stripper plate acts from the other.
Is the Airtac SCD Standard Cylinder SCD50X125TC the Right Cylinder?
Choose the SCD50 bore when your application needs roughly 825 N of balanced force at standard plant pressure. If you require more thrust, the SCD63 bore provides 1402 N at the same 0.5 MPa; for a lighter, more compact solution, the SCD40 delivers 528 N. Because the rod extends from both ends, ensure there is clearance behind the cylinder for the full stroke length plus the rear rod protrusion.
For direct replacement, match the 50 mm bore, 125 mm stroke, PT port thread, TC centre-trunnion mounting style, and the optional magnet if your existing unit uses sensors. If your load applies significant side force, a double-rod cylinder offers better guidance than a single-rod type, but a dedicated guided cylinder or external linear rail is still required for high moment loads.
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 SCD50X125TC FAQ
Push and pull force are identical on this double-rod cylinder. 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 in both directions.
A double-rod cylinder provides equal force and speed in both directions and a rear rod extension that can carry a sensor target, a mechanical stop, or secondary tooling. The through-rod design also improves rod bearing support and resists rotation better than a single-rod cylinder, though it does not replace a fully guided actuator under heavy side loads.
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