The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø250mm bore, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-50S is a heavy-duty, double-acting single-rod cylinder with a field-adjustable stroke end, designed for large-scale industrial automation. With a 250 mm bore, it delivers a substantial 24544 N of push force at 0.5 MPa, and the rear adjusting screw provides up to 50 mm of stroke-end retraction, allowing precise mechanical tuning for format changes or wear compensation without replacing the unit.
This model features a built-in magnet (-S), enabling direct mounting of CMSG/DMSG/EMSG sensors for reliable, non-contact position feedback along its 350 mm nominal stroke. The cylinder uses a 50 mm diameter piston rod with an M42x2 thread, PT1 inch ports, and a 40 mm air cushion for smooth deceleration of high-inertia loads. Its tie-rod construction and ISO 6430 class dimensions ensure robust, serviceable performance in demanding environments.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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 final clamping position on large hydraulic-style pneumatic presses. The 50 mm adjustment range allows operators to quickly adapt the stroke end for different material thicknesses or tooling setups, ensuring consistent clamping force without mechanical stop changes.
Actuate heavy-duty gates or pop-up stops on large conveyor systems. The adjustable stroke lets commissioning engineers dial in the exact gate position during setup and easily compensate for wear on the stop mechanism over time, maintaining precise product flow control.
Control the stroke end on forming or bending machines for large components. The SCJ250's high force capacity and adjustable end position are ideal for commissioning new product formats, allowing for quick, tool-free mechanical adjustments to achieve the correct final forming depth.
Choose the SCJ250 for applications requiring the highest force in the SCJ family, with 24544 N of push at 0.5 MPa. If your force requirements are lower, stepping down to the 200 mm bore provides 15708 N of push, which may offer a more compact and cost-effective solution. For applications needing a fixed, non-adjustable stroke, the standard SC series is a simpler alternative, while a guided cylinder is recommended if the 350 mm stroke creates significant side-loading risks on the rod.
This SCJ250X350-50S is a direct replacement for an identical AirTAC model with the same 250 mm bore, 350 mm nominal stroke, 50 mm adjustment range, PT thread, and built-in magnet. The 350 mm stroke is within the standard range for this bore, but always verify that the rod is externally guided to prevent bending under high side loads.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder provides 24544 N of push force and 23562 N of pull force. The adjustable stroke is a mechanical screw on the rear cap that retracts the piston's end position by up to 50 mm. It sets a new physical stroke limit but does not change the cylinder's force output or speed.
No, as a standard double-acting cylinder, it will not hold position under load if air pressure is lost or the valve is centered. The air cushion only decelerates the piston at the stroke end, and the adjusting screw only sets the stroke limit. To safely hold a heavy load without air pressure, you must use an external mechanical lock, a rod brake, or a pilot-operated check valve.
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