The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø250mm bore, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X175-50 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, built on a rugged tie-rod construction. Its 250 mm bore generates 24544 N of push force at 0.5 MPa, while the rear-cap adjusting screw provides up to 50 mm of stroke-end reduction, letting you dial in the exact stopping position without changing the cylinder body. The 50 mm diameter piston rod and 1-inch PT ports supply the flow needed for consistent big-bore cycling.
This model falls into the ISO 6430 class for larger cylinders, with a body length A of 409 mm and a 40 mm air cushion to decelerate the piston smoothly. The adjustable stroke is purely mechanical, acting on the stroke end only, and does not alter the cylinder's force output. It is suited for heavy-duty applications where the final stop position must be fine-tuned during commissioning or after tooling wear.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 50 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. |
| ×175 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
Adjust the stroke end by up to 50 mm to set the precise bottom-dead-centre position on a large forming press, compensating for different die heights or material spring-back without dismounting the cylinder.
Fine-tune the opening of a heavy-duty hopper gate or diverter chute. The adjustable stroke lets operators set the exact material flow gap on-site during initial setup.
Use the rear adjusting screw to set the final clamp gap for varying workpiece thicknesses in a timber laminating or steel fabrication jig, ensuring consistent pressure without mechanical shims.
Step up to this 250 mm bore when a 200 mm cylinder's 15708 N push at 0.5 MPa is insufficient for the load. If your application requires a fixed, non-adjustable stroke, the standard SC250X175 is the direct alternative. For replacement, match the bore, nominal stroke, and the -50 adjustable range, along with the PT port thread. At 175 mm of stroke, rod bending is typically not a primary concern for this large rod diameter, but for any off-axis loading, an external guide or a guided cylinder should be considered to protect the rod bearing and seals.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The pull force is lower due to the area of the 50 mm piston rod. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5006 kgf.
Yes, provided the nominal stroke and port thread (PT) match. The SCJ250 has the same mounting footprint and force characteristics as the SC250 but adds a rear adjusting screw for a 50 mm stroke-end reduction. Ensure the slightly longer body length A (409 mm) fits your machine envelope.
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