The AirTAC Airtac SCJ200 Standard Cylinder SCJ200X125-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø200mm bore, 125mm nominal stroke, PT3/4 ports and adjustable end cushioning.
The SCJ200X125-30 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family. Its defining feature is a rear-cap adjusting screw that provides up to 30 mm of stroke-end adjustment, allowing you to fine-tune the piston's stopping position without replacing the cylinder or adding external hard stops. With a 200 mm bore and a 40 mm piston rod, this model delivers a substantial 15708 N of push force at 0.5 MPa, making it suitable for heavy-duty clamping, pressing, and positioning tasks where precise end-point control is critical.
This cylinder operates on filtered air at 0.15–1.0 MPa and uses a PT3/4 port with an M36x2 rod thread. The body length A for this SCJ model is 342 mm, and it features a 33 mm air cushion for smooth deceleration. The standard TPU seals provide reliable performance in temperatures from -20 to +70 °C. As a genuine AirTAC component, it offers dependable, repeatable motion control for demanding industrial automation applications.
| Model | Airtac SCJ200 Standard Cylinder SCJ200X125-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø200 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 30 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/4 |
| Rod thread | M36×2 |
| 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, 33 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 15708 N | 15080 N |
| 0.7 MPa | 21991 N | — |
| Max (@1.0 MPa) | 3204 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 200 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -30 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Fine-tune the end position of a heavy press or clamping mechanism during initial machine setup without needing to fabricate or shim mechanical stops, saving significant commissioning time.
Adjust the clamping stroke on a large welding fixture to accommodate variations in workpiece thickness or to compensate for electrode wear over time, ensuring consistent clamping force.
Quickly adapt the stroke of an actuator on a large packaging or forming machine to handle different product sizes, eliminating the need to swap out the cylinder for each format change.
Select the SCJ200X125-30 when your application requires a high-force actuator with the ability to make fine, on-machine adjustments to the stroke end position, such as during commissioning or for format changeovers. If you need more force, the SCJ250 series offers 24544 N of push at 0.5 MPa. For a lighter, more compact solution, the SCJ160 provides 10053 N. If your application does not require stroke adjustability, a fixed-stroke SC200X125 cylinder is a simpler and more cost-effective alternative. The adjustable stroke is purely mechanical, setting the stroke end; it does not regulate force or speed.
For a direct replacement, match the 200 mm bore, 125 mm nominal stroke, and 30 mm adjustment range. Ensure the port thread is PT and the mounting style is basic. If your application involves significant side loads, consider an external guide rail system or a guided cylinder, as the 40 mm rod on this long-stroke cylinder may be subject to bending moments under off-center loads.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 15708 N, and the pull force is 15080 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 31416 N. The pull force is lower due to the area of the 40 mm piston rod.
No. The rear adjusting screw only sets the physical stroke end position. It is not a locking device. Like any standard pneumatic cylinder, the SCJ will not hold a load if air pressure is lost or the valve is centered. For mid-stroke holding, you would need an external rod lock or a pilot-operated check valve.
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