The AirTAC Airtac SCD Standard Cylinder SCD40X400 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, 400mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X400 double-rod pneumatic cylinder produces an identical 528 N of thrust in both directions at 0.5 MPa, thanks to its through-rod design that equalizes the effective piston area. With a 16 mm diameter rod extending from both ends and a 400 mm stroke, it is well-suited for tasks like two-sided tooling, symmetrical clamping, or transfer mechanisms where consistent force and speed are critical.
This genuine AirTAC tie-rod cylinder features a PT1/4 port, an M12x1.25 rod thread, and a 21 mm adjustable air cushion at each end for smooth deceleration. The retracted body length A is 191 mm, and the double-rod construction provides superior rod guidance compared to a single-rod cylinder, helping to resist minor side loads without needing an external guide.
| Model | Airtac SCD Standard Cylinder SCD40X400 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 400 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. |
| ×400 | 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.
Operates tooling or clamps on both ends of the cylinder simultaneously, using the 528 N force available from each rod for balanced, symmetrical workholding.
Moves a part carrier between two positions with equal speed and force, using the rear rod to trigger limit switches or carry a secondary stop.
The dual 16 mm rods provide inherent anti-rotation stability for pushing or ejecting parts, maintaining alignment without a dedicated external guide.
For applications needing more force, consider stepping up to the SCD50 bore, which provides 825 N at 0.5 MPa. If your task only requires force in one direction, the single-rod SC40 series is a more compact and cost-effective alternative. For significant side loads or long-stroke bending moments, a guided cylinder is recommended over a double-rod cylinder alone. To replace an existing SCD40X400, match the 40 mm bore, 400 mm stroke, PT port thread, basic mounting style, and the absence of a magnet option.
Double-rod checklist
The force is equal in both directions. It provides 528 N at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need identical force and speed in both directions, a rear rod for mounting sensors or tooling, or the improved bearing support and anti-rotation that a through-rod design offers.
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