Airtac SCD Standard Cylinder SCD63X68S
The AirTAC Airtac SCD Standard Cylinder SCD63X68S 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. Ø63mm bore, 68mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Rod (both ends)Ø20 mm
- Stroke68 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD63X68S
The SCD63X68S is a double-acting, double-rod pneumatic cylinder delivering identical force in both directions—1402 N at 0.5 MPa and 2523 N at the maximum operating pressure of 0.9 MPa. Its 20 mm diameter rod extends from both end caps, making it ideal for applications where tooling or a sensor flag must be mounted on the rear rod, or where symmetric bearing loading is required.
This specific 68 mm stroke is a non-standard length, built to order for precise machinery envelopes. The cylinder body has a length of 210 mm (A dimension) and features an adjustable pneumatic cushion of 28 mm at each end to decelerate the piston smoothly. The integrated magnet, indicated by the 'S' suffix, allows direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors on the tie-rod barrel for reliable end-of-stroke detection.
Airtac SCD Standard Cylinder SCD63X68S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD63X68S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 68 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, 28 mm |
| Max stroke | Up to 1500 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 (Ø63mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1402 N | 1402 N |
| 0.7 MPa | 1962 N | 1962 N |
| Max (@1.0 MPa) | 286 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 SCD63X68S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 63 | Bore size in mm. |
| ×68 | 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 SCD63X68S Is Used
Bidirectional Clamping
The equal push and pull force of 1402 N at 0.5 MPa makes this cylinder perfect for a two-sided clamp or fixture where the workpiece is secured with the same pressure from either direction.
Stroke Sensing on Both Ends
With the built-in magnet, a DMSG sensor can be clamped to the tie-rods to detect the piston's position. The rear rod can also carry a physical flag to break a slot sensor for a redundant home signal.
Non-Rotating Tooling
Mount a forming tool or label applicator on the front rod and a counterbalance or guide block on the rear rod. The dual-rod support helps maintain alignment better than a single-rod cylinder in light-duty pressing.
Is the Airtac SCD Standard Cylinder SCD63X68S the Right Cylinder?
Choose the 63 mm bore SCD when your application needs around 1400 N of balanced force at standard plant pressure. If you require more thrust, the SCD80 pushes and pulls with 2268 N at the same 0.5 MPa. For simple push-only tasks where a rear rod is unnecessary, a single-rod SC63 cylinder provides a higher push force (1760 N at 0.5 MPa) and a lower pull force, making it a more economical choice if the load is only in one direction.
As a direct replacement, this unit must match another SCD63 with a 68 mm stroke, PT ports, basic mounting, and the magnet option. The through-rod design offers better guidance than a single-rod cylinder but does not replace a fully guided unit if the application imposes significant side loads. For strokes longer than 300 mm on this bore, always evaluate rod buckling and consider an external guide rail.
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 SCD63X68S FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. The effective piston area is calculated by subtracting the 20 mm rod area from the 63 mm bore area. The force is 1402 N at 0.5 MPa, 1962 N at 0.7 MPa, and 2523 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD63 when you need symmetric force and speed in both directions, or when you require a rear rod extension to mount tooling, a mechanical stop, or a sensor target. The through-rod design also provides better support for the piston rod against side loads than a single-rod SC cylinder, though it is not a substitute for a fully guided actuator under heavy lateral forces.
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