The AirTAC Airtac SCD Standard Cylinder SCD40X40S 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, 40mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X40S is a compact double-rod pneumatic cylinder where the 16mm piston rod extends through both end caps, giving you identical push and pull output in both directions—528 N at 0.7 MPa. With a short 40 mm stroke and a body length A(SCD) of 191 mm, it fits neatly into tight spaces that need a through rod for tooling or a rear sensor flag.
This model includes a built-in magnet, so you can mount CMSG, DMSG, or EMSG reed or solid-state sensors directly on the tie-rod barrel for non-contact end-of-stroke sensing. The adjustable air cushion at each end (21 mm long) helps decelerate the piston smoothly, and the M12x1.25 rod thread on both ends makes attaching fixtures straightforward.
| Model | Airtac SCD Standard Cylinder SCD40X40S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 40 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. |
| ×40 | 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 force in both directions makes this cylinder ideal for a clamp that must grip with the same pressure whether it extends or retracts, simplifying the pneumatic circuit.
With the built-in magnet and a rear rod extension, you can mount a CMSG sensor on the back side to detect piston position without interfering with the front tooling.
The dual-rod guidance provides better anti-rotation than a single-rod cylinder, useful for a short-stroke alignment pin or ejector where twisting the tool is not acceptable.
If 528 N at 0.7 MPa is a little light, stepping up to the 50 mm bore SCD50 series gives you 1154 N at the same pressure. For a longer stroke in this 40 mm bore, the standard range goes up to 1200 mm, but for strokes beyond 300 mm you should check the unsupported rod for buckling and consider an external guide. When you need a genuine AirTAC replacement, match these five points: 40 mm bore, 40 mm stroke, PT1/4 port thread, your SCD mounting accessory (this unit is basic, but FA, LB, or TC kits are available), and the -S magnet option. If your application only needs force from one end, the single-rod SC series is a lighter, simpler alternative.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa you get 528 N, at 0.7 MPa you get 739 N, and at the maximum operating pressure of 0.9 MPa the force is 950 N in both directions.
Choose the SCD when you need the same force and speed in both directions, or when you need a rear rod extension to mount a sensor flag, stopper bolt, or secondary tooling. The through rod also provides better support for the piston, reducing uneven seal wear.
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