The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X100-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø250mm bore, 100mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X100-75 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke reduction, allowing you to fine-tune the end position without swapping the cylinder. With a 250 mm bore and a 50 mm diameter piston rod, this ISO 6430 class tie-rod cylinder delivers a substantial 24544 N of push force at just 0.5 MPa, making it suitable for heavy-duty industrial positioning tasks.
This model features a nominal 100 mm stroke, adjustable cushioning at both ends, and a G1 port for high flow. The body length A(SCJ) is 409 mm, and the operating pressure range is 0.15 to 1.0 MPa. The default configuration includes a TPU seal for standard temperatures (-20 to +70 °C) and PT threads. For position sensing, a magnet can be added by ordering the -S suffix.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X100-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 75 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. |
| ×100 | Nominal (maximum) stroke length in mm. |
| -75 | 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.
The 75 mm adjustment range allows operators to quickly recalibrate the final pressing depth on a heavy-duty assembly press during format changeovers, without the downtime of mechanical stop adjustments.
Fine-tune the push-off point for a reject gate handling large, heavy packages. The adjustable stroke compensates for wear on the gate mechanism, ensuring a consistent and reliable seal every cycle.
In a steel processing line, this cylinder can position a heavy guide rail. The field-adjustable stroke is critical for commissioning and for taking up mechanical play that develops over time in the high-vibration environment.
Choose the SCJ250X100-75 when you need a powerful, field-tunable end-stop within a 75 mm window. If your force requirement is slightly lower, consider stepping down to the 200 mm bore, which provides 15708 N of push force at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC250X100 is a direct alternative. To ensure a correct replacement, match the 250 mm bore, 100 mm nominal stroke, 75 mm adjustment range, and PT port thread. This cylinder uses a basic mount; if a pivoting motion is required, the TC centre trunnion mount is available as an accessory. For this 100 mm stroke, the rod is well-supported, but for strokes over 300 mm, always assess side loads and consider an external guide.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 24544 N, and the pull force is 23562 N (accounting for the 50 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The 75 mm adjustment screw does not alter the cylinder's force output.
No. Like all standard pneumatic cylinders, the SCJ250X100-75 will not hold its position if air pressure is lost or the valve is centered. The adjustable screw only sets the physical stroke end. To safely hold a heavy load without live pressure, you must add an external mechanical lock or a pilot-operated check valve.
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