The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X200-50S 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, 200mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X200-50S is a heavy-duty double-acting single-rod pneumatic cylinder with a field-adjustable stroke end, allowing operators to fine-tune the piston stop position by up to 50 mm without removing the unit from the machine. With a 250 mm bore delivering 24544 N of push force at just 0.5 MPa, this tie-rod cylinder is built for large-scale pressing, clamping, and positioning tasks where both power and on-the-fly stroke calibration are critical.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the barrel for reliable end-of-stroke detection. The ISO 6430 class body features a 50 mm diameter piston rod, a 40 mm adjustable air cushion, and a PT1 inch port, ensuring smooth deceleration of heavy loads at speeds up to 500 mm/s.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X200-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 200 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. |
| ×200 | 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.
Adjust the end-of-stroke by up to 50 mm to precisely set the pressing depth for forming or laminating operations, accommodating different material thicknesses without changing the cylinder.
Fine-tune the opening position of a diverter gate on a conveyor line handling heavy pallets or large packages, using the sensor magnet to confirm the gate is fully retracted.
Periodically adjust the stroke end to take up mechanical wear on clamp pads or tooling fixtures in heavy machining centers, maintaining consistent clamping force without replacing the actuator.
Choose the SCJ250 bore when your application demands over 24000 N of push force at standard shop air pressure; if your load requires less, the SCJ200 bore provides 15708 N push at 0.5 MPa in a lighter, more compact package. The 50 mm adjustable stroke range is ideal for commissioning new tooling or accommodating part tolerance variations, but if you need a fixed, repeatable stroke with no field adjustment, the standard SC fixed-stroke cylinder is a simpler alternative. For direct replacement, match a genuine AirTAC SCJ adjustable cylinder with a 250 mm bore, 200 mm nominal stroke, 50 mm adjust range, PT port thread, and a built-in magnet. Given the 200 mm stroke, always verify that side loads are managed with an external guide rail or rod alignment coupler to prevent bending of the 50 mm rod.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5006 kgf. The pull force is lower because the piston rod reduces the effective area on the return stroke.
Yes, if you need the ability to adjust the stroke end by up to 50 mm. The SCJ250X200-50S matches the mounting footprint of the SC series and uses the same PT1 inch port and basic mounting. Ensure your existing sensor setup is compatible with the built-in magnet on this -S model, or you can simply remove the sensors if they are not needed.
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