Airtac SCD Standard Cylinder SCD50X690TC
The AirTAC Airtac SCD Standard Cylinder SCD50X690TC 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, 690mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke690 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD50X690TC
The SCD50X690TC is a double-acting, double-rod pneumatic cylinder that delivers perfectly symmetrical force in both directions, rated at 825 N push and pull at 0.5 MPa. Its through-rod design, featuring a 20 mm diameter rod extending from both ends, subtracts the same area from each chamber, making it ideal for applications where balanced speed and thrust are critical, such as operating tooling on both sides of the piston.
This model is configured with a TC centre trunnion mount (includes TCM1 bracket, order code F-SC50TC) for pivoting motion, and its 690 mm stroke is well within the 1200 mm maximum standard stroke for the 50 mm bore. The body length A(SCD) is 207 mm, and the adjustable air cushion at each end is 21 mm long, providing smooth deceleration without any load-holding capability.
Airtac SCD Standard Cylinder SCD50X690TC Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD50X690TC |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 690 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 SCD50X690TC
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×690 | 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 SCD50X690TC Is Used
Two-Sided Transfer Shuttles
The equal push/pull force and rear rod extension make it perfect for shuttling parts between two stations, where a stopper or secondary tool can be mounted on the back end without affecting forward thrust.
Synchronized Clamping
Use the front and rear rods to drive two separate clamping arms simultaneously, ensuring perfectly timed and balanced clamping pressure from a single cylinder body.
Anti-Rotation Linear Guides
The dual-rod configuration provides inherent resistance to rotation, making it suitable for simple linear motion tasks where adding a full external guide rail is not feasible but some twist prevention is needed.
Is the Airtac SCD Standard Cylinder SCD50X690TC the Right Cylinder?
Choose the SCD50 bore when your application needs the balanced 825 N force at 0.5 MPa; if you require more thrust, stepping up to the 63 mm bore provides 1402 N at the same pressure, while the 40 mm bore offers 528 N for lighter tasks. A double-rod cylinder is the right choice when you need to mount tooling or sensors on the rear rod, but if you only need force from one end, the single-rod SC series is more compact. For this 690 mm stroke, be mindful of rod buckling under compressive loads; if the cylinder is pushing a heavy mass, consider an external guide rail to prevent bending of the unsupported 20 mm rod. This SCD50X690TC is a direct replacement for any AirTAC SCD50 of the same stroke, provided the mounting (TC), port thread (PT), and magnet option (none) are identical.
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 SCD50X690TC FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. 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 produces 1484 N in both directions.
Choose the SCD when you need to attach tooling, a sensor flag, or a mechanical stop to the rear rod, or when you require equal force and speed in both directions. The through-rod also provides better support for the piston, reducing uneven wear on the bearing and seals compared to a single-rod cylinder under side-load conditions.
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