Airtac SCD Standard Cylinder SCD40X350
The AirTAC Airtac SCD Standard Cylinder SCD40X350 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, 350mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke350 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X350
The SCD40X350 is a double-acting, double-rod pneumatic cylinder that produces identical push and pull force of 528 N at 0.5 MPa, thanks to its 16 mm rod passing through both end caps. This 350 mm stroke model is built on a 191 mm body length and uses PT1/4 ports, making it a balanced actuator for tasks needing equal speed and thrust in both directions.
With a 21 mm air cushion at each end, the cylinder decelerates the piston smoothly, reducing impact noise. The through-rod design provides better guidance than a single-rod cylinder of the same bore, helping to resist minor twisting. At the maximum operating pressure of 0.9 MPa, the output reaches 950 N each way, giving you a consistent force profile across the full cycle.
Airtac SCD Standard Cylinder SCD40X350 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X350 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 350 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 SCD40X350
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SCD40X350 Is Used
Two-Sided Transfer Shuttles
The rod extending from both ends allows a single cylinder to push a pallet into position and then retract a stop pin on the opposite side, synchronizing two actions with one actuator.
Equal-Force Clamping
Delivers 528 N of clamping force from either rod end at 0.5 MPa. Ideal for fixtures where a part must be clamped from two opposing sides with perfectly matched pressure.
Dual-Sided Diverter Gates
Use the front rod to actuate a diverter flap while the rear rod trips a confirmation sensor. The symmetric force ensures the gate moves consistently regardless of which direction it travels.
Is the Airtac SCD Standard Cylinder SCD40X350 the Right Cylinder?
Choose the SCD40X350 when your application requires identical force and speed for both extend and retract strokes. If you need more thrust, stepping up to the SCD50 bore provides 825 N at 0.5 MPa. For applications where only one end of the rod needs to do work, a single-rod SC series cylinder is a simpler and more cost-effective choice. This double-rod cylinder is not a guided unit; if your 350 mm stroke involves significant side loads, pair it with an external guide rail or switch to a guided cylinder.
As a direct replacement, match the 40 mm bore, 350 mm stroke, PT port thread, and the basic mounting configuration. For non-contact position sensing, consider the SCD40X350-S variant which includes a built-in magnet for mounting CMSG or DMSG sensors directly on the barrel.
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 SCD40X350 FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it outputs 528 N, at 0.7 MPa it outputs 739 N, and at the maximum operating pressure of 0.9 MPa it reaches 950 N in both directions.
Choose the SCD when you need to mount a tool or sensor flag on the rear rod, require perfectly equal force and speed in both directions, or want the improved bearing support that a through-rod provides to resist deflection. If you only need force from one end, the SC single-rod series is typically sufficient.
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