Airtac SCD Standard Cylinder SCD40X50
The AirTAC Airtac SCD Standard Cylinder SCD40X50 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø16mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø40mm bore, 50mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke50 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X50
The SCD40X50 is a compact double-acting, double-rod pneumatic cylinder that produces an identical 528 N of force in both directions at 0.7 MPa, thanks to its 16 mm rod passing through both end caps. This symmetry eliminates force differentials, making it ideal for applications where a tool or sensor must be mounted on the rear rod end.
With a 50 mm stroke and a 191 mm body length (A dimension), this tie-rod cylinder fits neatly into tight automation cells. Its adjustable air cushion decelerates the piston smoothly at each end of travel, and the PT1/4 ports ensure straightforward pneumatic connection.
Airtac SCD Standard Cylinder SCD40X50 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X50 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 50 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | 739 N |
| Max (@1.0 MPa) | 108 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 SCD40X50
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SCD40X50 Is Used
Two-Sided Transfer
The rear rod extension operates a secondary pusher or stripper plate, synchronizing motion without extra valves.
Anti-Rotation Guide
The dual-rod support naturally resists rotation, useful for keeping a label applicator or stamp aligned without a external guide rail.
Rear Flag Sensing
A sensor target mounted on the rear rod end allows stroke confirmation when the front end is inaccessible.
Is the Airtac SCD Standard Cylinder SCD40X50 the Right Cylinder?
Choose the SCD40X50 when your mechanism needs balanced, two-sided actuation in a 40 mm bore. If you require more thrust, the SCD50 series steps up to 825 N at 0.7 MPa. For applications needing only a single working end, the standard SC single-rod cylinder is a lighter and more cost-effective choice. Note that while the through-rod improves guidance, it is not a substitute for a guided cylinder under significant side loads.
For direct replacement, match an existing AirTAC SCD cylinder on five points: 40 mm bore, 50 mm stroke, PT port thread, basic mounting, and the absence of a magnet. This ensures a drop-in fit without modifying your machine.
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 SCD40X50 FAQ
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it outputs 528 N, at 0.7 MPa it is 739 N, and at the maximum operating pressure of 0.9 MPa it reaches 950 N.
Choose the SCD when you need to mount tooling or sensors on both ends of the cylinder, require absolutely equal force and speed in both directions, or need the improved bearing support and anti-rotation characteristics of a through-rod design.
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