Airtac SCD Standard Cylinder SCD40X30
The AirTAC Airtac SCD Standard Cylinder SCD40X30 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, 30mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke30 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X30
The SCD40X30 is a compact double-rod pneumatic cylinder that delivers identical force in both directions—528 N at 0.7 MPa—because the 16 mm rod passes through both end caps. Its 30 mm stroke and 191 mm body length A(SCD) suit short-travel tasks where a rear rod extension is needed for a sensor flag or secondary tooling.
Both rod ends share the M12x1.25 thread, letting you mount workpieces on either side. The adjustable air cushion on each end decelerates the piston smoothly, and the tie-rod construction makes it straightforward to maintain. Operating pressure spans 0.15–1.0 MPa with standard PT1/4 ports.
Airtac SCD Standard Cylinder SCD40X30 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X30 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 30 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 SCD40X30
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 SCD40X30 Is Used
Reciprocating Transfer
The equal force and speed in both directions make the SCD40X30 ideal for small part shuttles where the return stroke must match the forward stroke exactly.
Rear Stroke Sensing
The rear rod extension provides a clean mounting point for a flag or target, enabling end-of-stroke detection without cluttering the front tooling area.
Non-Rotating Alignment
With a rod on each end, the piston assembly resists rotation better than a single-rod cylinder, helping maintain alignment in light push-and-pull gauging fixtures.
Is the Airtac SCD Standard Cylinder SCD40X30 the Right Cylinder?
Choose the SCD40X30 when you need balanced push-pull force from a 40 mm bore. If 528 N at 0.7 MPa is too light, step up to the SCD50 (825 N at 0.7 MPa); if you need a single-rod cylinder with higher push force on the full-bore side, the SC series is a better match. For true side-load resistance, pair the cylinder with an external guide rather than relying solely on the dual-rod support.
To replace an existing unit, match bore (40 mm), stroke (30 mm), PT port thread, SCD mounting accessory, and magnet option. This basic model ships without a magnet or mounting bracket—add -S for a sensor-ready magnet and -LB or -FA for foot or front-flange mounting.
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 SCD40X30 FAQ
Push and pull force are identical on this double-rod cylinder. At 0.5 MPa it outputs 528 N, at 0.7 MPa it reaches 739 N, and at the maximum operating pressure of 0.9 MPa it delivers 950 N. Both directions use the same effective area (bore area minus 16 mm rod area).
Pick the SCD when you need a rear rod to mount tooling, a sensor flag, or a mechanical stop, or when you require perfectly equal force and speed in both directions. The through-rod also improves guidance and reduces piston rotation compared to a single-rod design, though it is not a substitute for an externally guided cylinder under side load.
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