Airtac SCD Standard Cylinder SCD40X330
The AirTAC Airtac SCD Standard Cylinder SCD40X330 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, 330mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke330 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X330
The SCD40X330 is a double-acting pneumatic cylinder with a through-rod design, meaning the 16 mm diameter piston rod extends from both ends of the 191 mm body. This configuration guarantees identical push and pull force in both directions—528 N at 0.7 MPa—because the rod area is subtracted from the piston on both sides. The 330 mm stroke operates within the bore's 1200 mm maximum standard range, making it a readily available size for symmetrical linear tasks.
Equipped with adjustable pneumatic cushioning over the final 21 mm of travel, the cylinder decelerates the piston smoothly at each end, reducing impact noise and wear. The PT1/4 ports and M12x1.25 rod threads provide standard connectivity, while the double-rod setup inherently offers better guidance and anti-rotation than a single-rod cylinder, making it well-suited for applications where a rear rod end can carry a sensor flag or secondary tooling.
Airtac SCD Standard Cylinder SCD40X330 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X330 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 330 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 SCD40X330
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×330 | 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 SCD40X330 Is Used
Two-Sided Transfer Shuttles
The equal force and speed in both directions make the SCD40X330 ideal for shuttling parts between two fixed positions, where a tool can be mounted on each rod end for simultaneous pick-and-place or transfer operations.
Rear-Mounted Stroke Sensing
With the rear rod extending out the back cap, a simple flag or cam can be attached to actuate external limit switches, providing a robust and direct method for end-of-stroke position feedback without needing barrel-mounted sensors.
Non-Rotating Pusher Stations
The dual-rod support provides inherent anti-rotation, allowing the cylinder to push or press components without the piston rod twisting, which is critical for maintaining alignment in simple pressing or ejecting fixtures.
Is the Airtac SCD Standard Cylinder SCD40X330 the Right Cylinder?
This 40 mm bore SCD delivers 528 N of force at 0.7 MPa, sitting between the smaller 32 mm bore (483 N at 0.7 MPa) and the larger 50 mm bore (1154 N at 0.7 MPa). If your application requires more thrust, stepping up to the SCD50 is a direct path; if space is tight and the force is sufficient, the SCD32 is the lighter alternative. For tasks needing only a single working direction, a standard SC single-rod cylinder is a simpler and more cost-effective choice. Should the load apply significant side forces, a guided cylinder is necessary, as the dual-rod support of the SCD is not designed to handle high lateral loads.
At a 330 mm stroke, the unsupported rod length on each side can be considerable. Ensure the external load is guided and aligned axially to prevent rod bending or premature bearing wear. For a direct replacement, match the 40 mm bore, 330 mm stroke, PT1/4 port thread, basic mounting style, and the absence of a magnet sensor option.
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 SCD40X330 FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 528 N, at 0.7 MPa it produces 739 N, and at the maximum operating pressure of 0.9 MPa it delivers 950 N of force in both directions.
Choose the SCD when you need equal force and speed in both directions, or when you need to utilize the rear piston rod for mounting a sensor flag, a mechanical stop, or secondary tooling. The through-rod design also provides better rod guidance and anti-rotation than a single-rod cylinder, but it is not a replacement for a fully guided cylinder under side loads.
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