The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø250mm bore, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-10S is a large-bore double-acting single-rod cylinder with a rear adjusting screw that provides up to 10 mm of field-adjustable stroke-end reduction. With a 50 mm diameter piston rod and a push force of 24544 N at 0.5 MPa, this ISO 6430 class tie-rod cylinder is built for heavy-duty applications where the final stop position must be dialed in precisely during commissioning or after tooling wear.
This model includes a built-in magnet (-S suffix), allowing CMSG/DMSG/EMSG sensors to be clamped directly onto the barrel for reliable end-of-stroke detection. The cylinder body length A is 409 mm, and it features a 40 mm adjustable air cushion to decelerate the high inertia load smoothly. Operating on 40 µm filtered air, it handles pressures from 0.15 to 1.0 MPa across a temperature range of -20 to +70 °C.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 10 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. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -10 | 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-pneumatic press conversions, the 10 mm rear adjuster lets operators fine-tune the final press-fit depth on the fly without disassembling the tooling, compensating for part tolerance stack-ups.
For a bulk material diverter gate, the adjustable stroke end allows maintenance teams to recalibrate the closed position after the gate seat wears, ensuring a tight seal without replacing the cylinder.
The SCJ250X500-10S can be used to position a heavy guide roller, where the 10 mm adjustability is critical for aligning the roller parallel to the production line during initial setup and periodic maintenance checks.
Choose the SCJ250 bore when your application demands a push force around 24544 N at 0.5 MPa; if you can work with roughly 15708 N, stepping down to a 200 mm bore SCJ200 series reduces both physical size and air consumption. The 10 mm adjustable stroke range is ideal for fine-tuning end positions on large fixtures, but for applications needing a fixed, repeatable stroke without any field adjustment, a standard SC fixed-stroke cylinder is a simpler and more cost-effective choice. For this 500 mm nominal stroke, always verify that the piston rod is adequately supported against side loads; an external guide rail or a guided cylinder should be used if lateral forces are present. A direct replacement must match the 250 mm bore, 500 mm nominal stroke, 10 mm adjust range, PT port thread, and the built-in magnet configuration.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The maximum push force at the 0.9 MPa operating limit is 44178 N. Because it is a single-rod cylinder, the pull force is lower due to the area of the 50 mm rod.
To be a direct drop-in replacement, the other cylinder must be an AirTAC SCJ series with a 250 mm bore, a 500 mm nominal stroke, and a 10 mm adjustment range. You must also match the PT port thread and confirm the mounting style; this -S model has a built-in magnet for sensors, which the original must also have if you are using magnetic switches.
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