The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X200-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 200mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X200-20S is a heavy-duty double-acting single-rod cylinder delivering 24544 N of push force at 0.5 MPa, built for large-scale industrial automation. Its 50 mm diameter piston rod and PT1" ports provide robust flow and mechanical strength, while the rear adjusting screw allows the stroke end to be fine-tuned by up to 20 mm without removing the cylinder from the machine.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for reliable end-of-stroke or mid-stroke position feedback. With a body length of 409 mm and a 40 mm air cushion, it is a genuine AirTAC component designed for demanding, high-cycle applications where stroke calibration is critical.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X200-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 200 mm |
| Stroke adjustment | Up to 20 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. |
| -20 | 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.
In large hydraulic or pneumatic presses, the 20 mm adjustment screw allows operators to dial in the exact bottom-dead-centre position to compensate for tooling wear or varying material thickness without disassembling the tool set.
Controls material flow gates in mining or aggregate handling. The adjustable stroke lets technicians fine-tune the gate opening to match different material grades, while the magnet provides gate position confirmation to the central PLC.
Used on welding or assembly jigs for large structural steel components. The stroke-end screw provides a precise clamp depth setting for different beam sizes, and the integrated magnetic sensor confirms the clamp is fully engaged before the welding cycle starts.
Choose the SCJ250 bore when your application requires push forces in the 24.5 kN class at standard plant pressure. If your force requirement is closer to 15.7 kN, stepping down to the SCJ200 bore (15708 N push at 0.5 MPa) reduces air consumption and physical size. For applications needing a fixed, non-adjustable stroke, the standard SC series is a simpler alternative; however, the SCJ is the correct choice when commissioning trials, format changeovers, or process drift require periodic stroke-end recalibration. To replace this unit, match the 250 mm bore, 200 mm nominal stroke, 20 mm adjust range, PT port thread, and the built-in magnet option. For strokes of 300 mm or longer, always evaluate side-loading on the 50 mm rod and consider an external guide rail or a guided cylinder to prevent rod bending and premature seal wear.
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 0.9 MPa, the push force reaches 44178 N. The pull force is lower because the 50 mm piston rod reduces the effective piston area on the return stroke.
The rear-cap adjusting screw sets the mechanical end-stop for the retract stroke, allowing you to shorten the stroke by up to 20 mm from the nominal 200 mm. It is a single, field-adjustable end position, not an infinite multi-position actuator. For multiple intermediate stops, consider the SCT multi-position cylinder series.
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