The AirTAC Airtac SCD Standard Cylinder SCD40X620 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, 620mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X620 is a double-acting pneumatic cylinder with a 40 mm bore, 620 mm stroke, and a 16 mm rod extending from both ends. Because the rod area is subtracted on both sides, it produces an identical 528 N of thrust in push and pull at 0.5 MPa, making motion perfectly symmetrical for dual-sided tooling. At the maximum operating pressure of 0.9 MPa, force reaches 950 N each way.
This model's 191 mm body length (A dimension) and adjustable air cushion (21 mm) help manage end-of-stroke deceleration for the long 620 mm travel. The PT1/4 port and M12x1.25 rod thread are standard. As a tie-rod cylinder, it is not an ISO 15552 profile unit, but it provides a robust through-rod platform where a rear rod end can carry a stopper bolt, cam, or flag for external sensing without adding a separate guide.
| Model | Airtac SCD Standard Cylinder SCD40X620 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 620 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. |
| ×620 | 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 through-rod lets you mount a gripper or vacuum cup on each end, transferring parts between two parallel conveyors with equal speed and force in both directions.
Use the rear rod to drive a secondary forming die or equalizing clamp, ensuring both sides of a workpiece are engaged simultaneously with 528 N of force at 0.5 MPa.
Attach a sensor flag or cam to the rear M12x1.25 rod end to trigger external limit switches, keeping the front tooling area clear of sensors and wiring.
Choose the SCD40X620 when you require a 620 mm stroke with equal bidirectional force. If 528 N at 0.5 MPa is insufficient, stepping up to the 50 mm bore (SCD50) provides 825 N at the same pressure. For applications needing force in only one direction, the single-rod SC series is a lighter, more compact alternative. This cylinder is a direct replacement for another AirTAC SCD40X620 matching the PT port thread, basic mounting, and no magnet; confirm stroke and cushion length to ensure drop-in fit. For a 620 mm stroke, be mindful of the long, unsupported rod extension on both ends—consider an external linear guide or switch to a guided cylinder if the load applies any significant side force or bending moment to the rods.
Double-rod checklist
The push and pull force is identical because the rod extends from both ends. At 0.5 MPa it is 528 N, at 0.7 MPa it is 739 N, and at the maximum 0.9 MPa operating pressure it reaches 950 N.
Choose the SCD when you need equal force and speed in both directions, or when you need a rear rod extension to mount tooling, a mechanical stop, or a sensor target. The dual-rod design also provides better resistance to rod rotation than a single-rod cylinder, though it is not a substitute for a fully guided actuator under heavy side loads.
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