The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-30 is a large-bore, double-acting single-rod pneumatic cylinder with a field-adjustable stroke end, delivering a substantial 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 30 mm of fine-tuning on the stroke end position, making it ideal for heavy-duty applications where precise end-stop calibration is needed during commissioning or format changes without swapping the cylinder.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod, a 40 mm air cushion for controlled deceleration, and a G1" port. With a body length of 409 mm, it is engineered for demanding industrial environments, operating on 40 µm filtered air at pressures from 0.15 to 1.0 MPa and speeds of 30-500 mm/s.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 30 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. |
| -30 | 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 on a large hydraulic-style pneumatic press by adjusting the stroke end by up to 30 mm, ensuring consistent part forming without mechanical shimming.
In high-cycle baling or compacting equipment, use the adjustable screw to compensate for wear on compression plates, maintaining consistent material density over time without replacing the actuator.
Control the opening position of a heavy diverter gate on a conveyor line. The 30 mm adjustment range allows operators to quickly recalibrate the gate angle for different product sizes during a batch changeover.
Select the SCJ250 bore when your application requires the force class of roughly 24500 N push at standard plant pressure. For a step down in force, the SCJ200 bore provides 15708 N push at 0.5 MPa, which may suffice for lighter tooling and reduce air consumption. If stroke-end adjustment is not required, a fixed-stroke SC250X500 cylinder is a simpler, more cost-effective alternative. For this model, a direct replacement must match the 250 mm bore, 500 mm nominal stroke, 30 mm adjustable range, PT port thread, and basic mounting. At a 500 mm stroke, ensure the load is guided externally to prevent side-loading and rod bending, or consider a guided cylinder if the application lacks external support.
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. The theoretical maximum at 1.0 MPa is 5006 kgf. The push force is higher than the pull force because it is a single-rod cylinder.
Yes, if your old cylinder is an AirTAC SCJ250 with matching bore, nominal stroke, and port thread. The SCJ250X500-30 has a 30 mm adjustable range, so it can replicate a fixed 500 mm stroke and also be shortened. It is not dimensionally interchangeable with ISO 15552 cylinders and requires an exact match on the SCJ mounting style and rod thread (M42x2).
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