The AirTAC Airtac SCD Standard Cylinder SCD40X6 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, 6mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X6 is a compact double-rod pneumatic cylinder providing identical thrust in both directions, rated at 528 N at 0.7 MPa, thanks to its 16 mm rod passing through both end caps. With a short 6 mm stroke and a body length A of 191 mm, it excels in tight spaces where a rear rod connection is needed for a sensor flag or secondary actuation.
This tie-rod cylinder uses PT1/4 ports and features an adjustable air cushion (21 mm) to decelerate the piston smoothly at stroke end. Its symmetrical force output eliminates the performance imbalance of single-rod designs, making it ideal for precise two-sided tooling operations.
| Model | Airtac SCD Standard Cylinder SCD40X6 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 6 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.
| 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.
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×6 | 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.
The equal 528 N force in both directions makes the SCD40X6 perfect for two-sided clamping fixtures where uneven pressure could misalign delicate parts.
Use the protruding rear rod to mount a sensor flag or trip dog for end-of-stroke confirmation in compact automated assembly cells.
The dual-rod linkage provides inherent anti-rotation for a short-throw pusher, eliminating the need for an external guide in light-duty sorting gates.
Select the SCD40X6 when your application requires equal push and pull force in a very short stroke, with a rear rod for mounting a cam or position sensor. If you need higher force, step up to the SCD50 bore which provides 825 N at 0.5 MPa. For applications with significant side loads, a guided cylinder is a safer choice than relying solely on the double-rod's improved bearing support.
As a direct replacement, match the 40 mm bore, 6 mm stroke, PT1/4 port thread, and basic mounting configuration. This model is a standard stroke length, well within the 1200 mm maximum for the 40 bore.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. The effective piston area is reduced by the 16 mm rod on both sides, yielding 528 N at 0.7 MPa and 950 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need perfectly balanced speed and force in both directions, or require a rear rod extension to mount tooling, a mechanical stop, or a position sensor. The through-rod also provides better support for the piston, reducing uneven bushing wear.
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