The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X1000-20 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, 1000mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X1000-20 is a double-acting, single-rod pneumatic cylinder from AirTAC's adjustable-stroke series, providing a nominal 1000 mm stroke with a 20 mm rear-end adjustment range. This large-bore actuator delivers a substantial push force of 24544 N at 0.5 MPa, scaling up to 44178 N at the maximum operating pressure of 0.9 MPa, making it suitable for heavy industrial tasks requiring precise end-position tuning.
A rear-mounted adjusting screw allows machine builders to fine-tune the stroke end position on the fly, accommodating commissioning variances, format changes, or wear compensation without replacing the cylinder. The unit features a 50 mm diameter piston rod, an M42x2 rod thread, and a PT 1-inch port for high flow. Its tie-rod construction and 40 mm air cushion ensure robust, decelerated end-of-stroke performance in demanding environments.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X1000-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 1000 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. |
| ×1000 | 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.
Fine-tune the final pressing depth in large hydraulic or pneumatic presses by adjusting the rear screw, ensuring consistent part dimensions across production batches.
Dial in the exact stroke end for actuating large industrial valves during commissioning, preventing seat damage from over-travel while ensuring a full seal.
Adjust the opening position of a heavy-duty material diverter gate to perfectly match different product sizes on a conveyor line without mechanical modifications.
Select the SCJ250 when you need the highest force class in the SCJ family and the ability to dial in the stroke end point. If 24544 N of push force at 0.5 MPa is more than your application requires, stepping down to the 200 mm bore model reduces push force to 15708 N at the same pressure. For applications where the stroke length is fixed and never needs field adjustment, the standard SC250 fixed-stroke cylinder is a simpler, cost-effective alternative.
For a 1000 mm stroke, managing side loads is critical to prevent rod bending. An external guide rail or switching to a guided cylinder is strongly recommended if the load is not perfectly axial. This model is a direct replacement for another AirTAC SCJ250X1000-20 cylinder with the same PT port thread and basic mounting configuration.
Adjustable-stroke checklist
As a single-rod cylinder, push and pull forces differ. At 0.5 MPa, it provides 24544 N of push force and 23562 N of pull force. At the maximum operating pressure of 0.9 MPa, push force reaches 44178 N.
No. The SCJ250X1000-20 is not designed for position holding. The adjusting screw only sets the physical stroke end point. If air pressure is lost or the valve is centered, the piston can drift. For mid-stroke holding, you must add an external rod lock or a pilot-operated check valve.
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