The AirTAC Airtac SCD Standard Cylinder SCD40X250 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, 250mm stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCD40X250 is a double-acting, double-rod pneumatic cylinder that outputs an identical 528 N of thrust in both directions at 0.5 MPa, thanks to its through-rod design. With a 40 mm bore and a 16 mm rod extending from both ends, it provides balanced force and speed for symmetrical motion tasks.
This 250 mm stroke model uses a PT1/4 port and features an adjustable air cushion (21 mm length) at each end to decelerate the piston smoothly. The body length A(SCD) is 191 mm, and the cylinder is rated for 0.15-1.0 MPa operating pressure with a maximum speed of 800 mm/s.
| Model | Airtac SCD Standard Cylinder SCD40X250 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 250 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. |
| ×250 | 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 rod extending from both ends allows a single SCD40X250 to operate two mechanisms in sequence, such as opening and closing a dual-gate system simultaneously with equal force.
With a 16 mm rod guided by bearings in both end caps, this cylinder offers better resistance to rod rotation than a single-rod type, making it suitable for simple non-rotating push applications.
The equal 528 N push/pull force at 0.5 MPa ensures consistent acceleration and deceleration in both directions for a small transfer shuttle, moving parts between two stations smoothly.
Step up to the SCD50 bore if your application needs more than 825 N of force at 0.5 MPa; step down to the SCD32 if 345 N is sufficient and space is tighter. Choose this double-rod SCD over a single-rod SC when you require equal push/pull thrust, need to mount tooling or a sensor flag on the rear rod, or want the improved bearing support a through-rod provides—though it is not a substitute for a fully guided cylinder under heavy side loads. For a direct replacement, match the 40 mm bore, 250 mm stroke, PT1/4 port thread, and basic mounting style.
Double-rod checklist
Because the SCD is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it provides 528 N, at 0.7 MPa it provides 739 N, and at the maximum operating pressure of 0.9 MPa it delivers 950 N of thrust in both directions.
Choose the SCD40X250 when you need identical force and speed in both directions, or when you require a rear rod extension to mount a limit switch dog, a manual override knob, or secondary tooling. The dual-bearing support also offers slightly better side-load tolerance than a single-rod cylinder of the same bore.
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