The AirTAC Airtac SCD Standard Cylinder SCD40X30H 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, 30mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X30H is a short-stroke double-rod pneumatic cylinder engineered for high-temperature environments up to 150°C, thanks to its factory-fitted Viton (FKM) seals. With a 40 mm bore and 16 mm rod passing through both end caps, it delivers an identical 528 N of thrust in both push and pull directions at 0.7 MPa, ensuring perfectly symmetrical motion for dual-sided fixtures.
Its compact 30 mm stroke is ideal for precise ejection, clamping, or positioning tasks where space is tight but thermal resistance is critical. The cylinder body has a length A(SCD) of 191 mm, and the adjustable air cushion (21 mm) at each end decelerates the piston quietly, protecting end-cap seals in demanding hot-duty cycles.
| Model | Airtac SCD Standard Cylinder SCD40X30H |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 30 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. |
| ×30 | 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 Viton seals allow this cylinder to reliably eject parts from heated moulds, ovens, or drying stations where ambient temperatures reach 150°C, maintaining equal push-pull force for a retracting stripper plate.
Delivers identical 528 N clamping force from both rod ends at 0.7 MPa, perfect for a dual-sided clamp that grips a workpiece from two opposite sides simultaneously with a single cylinder.
The 30 mm stroke and through-rod design provide excellent bearing support for precise linear alignment tasks, such as pushing a component into a heated test socket or alignment jig.
This 40 mm bore model suits applications needing balanced force in a compact envelope. If your load requires more thrust, stepping up to the SCD50 bore provides 1154 N at 0.7 MPa. For applications where only one end of the rod needs to perform work, a standard single-rod SC cylinder is a simpler, more cost-effective choice. To replace an existing SCD40X30H, match the 40 mm bore, 30 mm stroke, PT port thread, and the high-temperature Viton seal specification; the basic mounting style accepts standard SCD foot (LB) or front flange (FA) accessories if needed later.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it produces 528 N, at 0.7 MPa it produces 739 N, and at the maximum operating pressure of 0.9 MPa it delivers 950 N of force in both directions.
No, like any standard pneumatic cylinder, the SCD40X30H will not hold its position if air pressure is exhausted or lost. The adjustable air cushion only decelerates the piston at the end of its stroke; it is not a locking or braking mechanism. For load holding without pressure, you must add an external rod lock or a pilot-operated check valve.
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