The AirTAC Airtac SCD Standard Cylinder SCD125X400S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø32mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø125mm bore, 400mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X400S is a double-acting, double-rod pneumatic cylinder that provides identical force and speed in both directions, making it a robust choice for symmetric, heavy-duty linear tasks. With a 125 mm bore and a 32 mm rod passing through both end caps, it generates a balanced 5734 N of thrust in each direction at 0.5 MPa, rising to 10321 N at the maximum operating pressure of 0.9 MPa.
This model features a 400 mm stroke and includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for precise, non-contact position feedback. The adjustable air cushion at each end (28 mm length) provides smooth deceleration, while the PT1/2 ports and M27x2 rod thread ensure straightforward integration into existing pneumatic circuits.
| Model | Airtac SCD Standard Cylinder SCD125X400S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 400 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 28 mm |
| Max stroke | Up to 1500 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | 8027 N |
| Max (@1.0 MPa) | 1169 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). |
|---|---|
| 125 | 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.
The equal push and pull force of the SCD125X400S makes it ideal for shuttle tables where a fixture or workpiece is moved between two stations with the same load and speed profile in both directions.
Use the rear rod extension to mount a second tool or a counter-support, enabling a balanced pressing or clamping operation from both sides of the cylinder with perfectly synchronized motion.
With the built-in magnet (-S), you can mount sensors on the rear end of the barrel to detect the piston's position via the rear rod, a common setup when the front end is inaccessible or exposed to debris.
For applications requiring less force, stepping down to the SCD100 bore reduces the balanced output to 3681 N at 0.5 MPa, while the SCD160 bore offers a substantial increase to 9425 N for heavier payloads. If your task only needs a working end on one side, the standard single-rod SC series is a more economical and compact alternative. This double-rod design offers better guidance than a single-rod cylinder, but for significant side loads, a dedicated guided cylinder or external linear rail is still required.
To ensure a drop-in replacement, match the 125 mm bore, 400 mm stroke, PT port thread, and the basic mounting style of this SCD125X400S. The 400 mm stroke is well within the 1500 mm maximum for this bore, but as stroke length increases, be mindful of potential rod deflection under load. For long-stroke applications, consider adding an external guide or using a rod support to prevent bending of the 32 mm through-rod.
Double-rod checklist
Because the piston rod extends through both ends, the effective pressure area is identical for both directions. The force is 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and 10321 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need to mount a tool, stopper, or sensor flag on the rear rod, or when you require perfectly equal force and speed in both directions. The through-rod also provides better support and anti-rotation characteristics than a single-rod cylinder.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.