Airtac SCD Standard Cylinder SCD40X300S
The AirTAC Airtac SCD Standard Cylinder SCD40X300S 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, 300mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke300 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X300S
The SCD40X300S is a double-acting, double-rod pneumatic cylinder where the piston rod extends from both ends, providing identical push and pull force of 528 N at 0.5 MPa. This symmetry is ideal for applications needing balanced motion in both directions, such as a transfer shuttle where tooling mounts on each rod end. The 16 mm diameter rod running through the cylinder body gives better bearing support than a single-rod design.
With a 300 mm stroke, this model is well within the 1200 mm maximum standard stroke for the 40 mm bore. The built-in magnet, denoted by the 'S' suffix, allows you to mount CMSG, DMSG, or EMSG sensors directly on the tie-rod barrel for non-contact position sensing, perfect for confirming end-of-stroke on the rear rod. The adjustable air cushion at each end, with a 21 mm cushion length, decelerates the piston smoothly to reduce impact noise.
Airtac SCD Standard Cylinder SCD40X300S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X300S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 300 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 SCD40X300S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SCD40X300S Is Used
Bidirectional Transfer Shuttles
The equal push/pull force of 528 N at 0.5 MPa makes this cylinder perfect for shuttling parts between two stations, where the load and speed requirements are identical in both directions.
Dual-End Position Sensing
The built-in magnet allows sensors to be placed on either end of the barrel. Use the rear rod as a sensor flag to confirm the piston's position in a compact space where the front rod is inaccessible.
Non-Rotating Pusher Mechanism
The through-rod design provides inherent anti-rotation stability. Mount a pusher plate on the front rod and a stop block on the rear rod for a simple, guided pushing application without a complex external guide system.
Is the Airtac SCD Standard Cylinder SCD40X300S the Right Cylinder?
Choose the SCD40 when you need equal force and speed in both directions. At 0.5 MPa, it provides 528 N each way. If you need more force, step up to the SCD50 bore, which delivers 825 N at the same pressure. For a lower force requirement, the SCD32 offers 345 N. If your application only requires force from one side, a single-rod SC cylinder is a more economical choice. For this 300 mm stroke, be mindful of side loads on the unsupported rod; if the load is not perfectly axial, consider an external guide rail or a guided cylinder to prevent rod bending.
This SCD40X300S is a direct replacement for any AirTAC SCD double-rod cylinder of the same 40 mm bore, 300 mm stroke, PT port thread, basic mounting, and built-in magnet. Ensure the replacement matches all five points to guarantee identical form, fit, and function.
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 SCD40X300S FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. The effective piston area is the same on both sides. At 0.5 MPa, the force is 528 N. At 0.7 MPa, it is 739 N, and at the maximum operating pressure of 0.9 MPa, it reaches 950 N.
You choose an SCD when you need perfectly equal force and speed in both directions, which a single-rod cylinder cannot provide due to the different piston areas. The SCD also offers a rear rod extension that can be used for mounting a secondary tool, a cam, or a sensor flag, and provides better guidance and anti-rotation support for the piston rod.
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