The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X50-20 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, 50mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X50-20 is a heavy-duty, double-acting single-rod cylinder delivering 24544 N of push force at just 0.5 MPa, making it suitable for high-force clamping and pressing operations. Its rear-cap adjusting screw provides a 20 mm field-adjustable stroke range, allowing operators to fine-tune the stroke end position for commissioning or wear take-up without dismounting the cylinder.
This ISO 6430 class tie-rod cylinder features a robust 50 mm diameter piston rod and a 40 mm air cushion for effective end-of-stroke deceleration. The body length A(SCJ) is 409 mm, and the PT1" port ensures high flow for demanding pneumatic circuits.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X50-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 50 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. |
| ×50 | 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.
The 24544 N push force at 0.5 MPa handles large bearing or bushing insertion, with the 20 mm stroke adjust enabling fine depth control for consistent assembly quality.
In paper or steel processing, the adjustable stroke screw allows operators to quickly reset the nip gap on large calendar rolls during product changeovers, minimizing downtime.
For heavy weld fixtures, the 20 mm adjustment range lets technicians dial in the exact clamping stroke to compensate for varying workpiece thicknesses without reprogramming the machine.
For applications requiring a similar force class but a smaller footprint, stepping down to the SCJ200 (15708 N push at 0.5 MPa) is an option. If the application demands a fixed, non-adjustable stroke, the standard SC series is a more economical choice. A direct replacement must match the 250 mm bore, 50 mm nominal stroke, 20 mm adjust range, and PT port thread.
For strokes of 300 mm or more, the long, heavy rod of a 250 mm bore cylinder is susceptible to side-load deflection. In such cases, an external guide rail or switching to a guided cylinder is strongly recommended to prevent rod bending and premature seal failure.
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 maximum push force at the 0.9 MPa operating limit is 44178 N.
Yes, provided the mounting and porting match. The SCJ250X50-20 has the same envelope as an SC250X50 but adds a rear adjusting screw. Ensure your machine has clearance for the longer rear cap and that the 20 mm stroke reduction is sufficient for your process.
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