The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-75 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, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-75 is a heavy-duty, double-acting single-rod pneumatic cylinder that puts fine stroke-end adjustment directly on the machine. With a 250 mm bore and a 350 mm nominal stroke, it delivers a substantial 24544 N of push force at just 0.5 MPa, making it suitable for large-scale pressing, clamping, and material handling tasks. The rear-cap adjusting screw provides a 75 mm field-adjustable range, allowing operators to shorten the stroke end to compensate for tooling wear or to set a precise stop position without dismounting the cylinder.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and a 1-inch PT port for high flow. It features an adjustable air cushion (40 mm length) for smooth deceleration of heavy loads and operates reliably in temperatures from -20 to +70 °C. The body length A(SCJ) is 409 mm, providing a robust platform for demanding industrial environments.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 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. |
| ×350 | 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.
During die changes in large stamping presses, the 75 mm adjustable stroke allows operators to fine-tune the final shut height without shimming, saving significant setup time.
Controls a diverter gate on a high-capacity conveyor for aggregates or grain. The stroke can be adjusted to precisely match the gate opening required for different material flow rates.
In a large-scale sawmill or structural welding fixture, the adjustable stroke end compensates for the gradual wear of clamp pads, maintaining consistent clamping force without replacing the pads.
Select the SCJ250 series when your application demands the highest force output in the SCJ family, with 24544 N of push at 0.5 MPa. If your force requirement is lower, stepping down to the SCJ200 bore reduces push force to 15708 N at the same pressure, offering a more compact and energy-efficient solution. For applications where the stroke length must be permanently fixed and never adjusted, the standard SC fixed-stroke cylinder is a simpler alternative. This cylinder is a direct replacement for an existing AirTAC SCJ250X350-75 with PT ports and basic mounting; ensure the adjust range matches the original 75 mm specification. For this 350 mm stroke length, carefully evaluate side-loading conditions—any off-axis force can cause rod bending. If side loads are unavoidable, integrate an external linear guide or consider a guided cylinder assembly.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N (due to the 50 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The theoretical maximum force at 1.0 MPa is 5006 kgf.
You can replace it if you need the field-adjustable stroke feature. The SCJ250X350-75 has the same bore, nominal stroke, and mounting interfaces but includes a rear adjusting screw that adds length. Ensure you have clearance for the longer SCJ body and that the 75 mm adjustment range meets your process needs.
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