The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø250mm bore, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-10S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, delivering a substantial 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides a 10 mm range to fine-tune the stroke end position, making it ideal for commissioning heavy-duty machinery or compensating for wear in large-scale industrial tooling without replacing the cylinder.
This model features a 50 mm diameter piston rod, a PT1 inch port, and an M42x2 rod thread for robust mechanical connections. The integrated magnet (-S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors on the tie-rod barrel for reliable end-of-stroke detection. As an ISO 6430 class cylinder, its body length A is 409 mm, and it includes a 40 mm air cushion to decelerate high-inertia loads smoothly.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 10 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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, 40 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 | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 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. |
|---|---|
| 250 | Bore size in mm. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -10 | 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 bottom-dead-center position of a large forming press during setup or after tooling changes, using the 10 mm screw adjustment to achieve precise part dimensions without reprogramming the main controller.
Calibrate the stroke end of a high-torque valve actuator in a water treatment plant. The adjustable stroke compensates for seat wear over time, ensuring a perfect seal with every cycle and extending valve service life.
Adjust the final push position of a palletizer's layer-forming ram. The 10 mm adjustment range allows operators to quickly adapt to slight variations in pallet or product stack heights between production runs.
Choose the SCJ250 when your application demands the highest force in the SCJ range, with 24544 N of push at 0.5 MPa. If your force requirement is lower, stepping down to a 200 mm bore reduces push force to 15708 N, which can save significant space and air consumption. This adjustable-stroke model is the right choice when you need to dial in a precise mechanical stop on a press or clamp; for a simpler, fixed-stroke solution, a standard SC cylinder is a more economical alternative. For this 350 mm stroke, be mindful of side-loading on the 50 mm rod. If the load is not perfectly guided, an external guide rail or a switch to a guided cylinder is strongly recommended to prevent rod bending and premature seal wear. A direct replacement must match the 250 mm bore, 350 mm nominal stroke, 10 mm adjust range, PT port thread, and the built-in magnet.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. The pull force is lower due to the area of the 50 mm piston rod. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N.
It can replace another AirTAC SCJ adjustable-stroke cylinder with the same 250 mm bore, 350 mm nominal stroke, and 10 mm adjustment range. To replace a fixed-stroke SC cylinder, you must ensure the SCJ's body length (A=409 mm) and the rear adjusting screw housing fit within your machine's available space.
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