The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø250mm bore, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X450-100 is a large-bore, double-acting single-rod pneumatic cylinder engineered for heavy-duty applications where the stroke end position must be field-tuned. Its rear-cap adjusting screw provides a 100 mm adjustment range, allowing operators to dial in the exact 450 mm maximum stroke end without removing the cylinder or adding external hard stops. With a 50 mm diameter rod and a 1-inch PT port, this tie-rod cylinder delivers substantial force for pressing, clamping, and material handling tasks.
At 0.5 MPa, the cylinder generates 24544 N of push force and 23562 N on the pull stroke, scaling up to a formidable 44178 N push at the maximum operating pressure of 0.9 MPa. The 40 mm air cushion at each end decelerates high-inertia loads smoothly. As an ISO 6430 class cylinder, it features a robust tie-rod construction with a body length of 409 mm, suitable for demanding industrial environments where stroke precision must be maintained over long production runs.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 100 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. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -100 | 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-style pneumatic presses, the 100 mm rear adjustment lets operators compensate for varying material thicknesses or tooling wear without dismantling the fixture. The 24544 N push force at 0.5 MPa provides ample clamping power for welding jigs and assembly presses.
For hopper gates or diverter chutes in mining and aggregate handling, the adjustable stroke allows precise control of the gate opening. The 50 mm rod and tie-rod construction withstand the harsh, dusty environment while the 40 mm cushion absorbs the shock of heavy gate closure.
On large textile or paper processing lines, the SCJ250X450-100 enables rapid stroke-end changes between product formats. The 100 mm adjustment range covers multiple product sizes, eliminating the need to stock multiple fixed-stroke cylinders and reducing changeover downtime.
Select the SCJ250X450-100 when your application requires a high-force actuator with a nominal 450 mm stroke that needs on-machine fine-tuning. If the 24544 N push force at 0.5 MPa is insufficient, stepping up to a larger bore is not possible as this is the largest in the SCJ family; instead, consider increasing the operating pressure within the 0.15-1.0 MPa range. For applications needing less force, the SCJ200 bore delivers 15708 N push at 0.5 MPa. The adjustable stroke is ideal for commissioning and format changes, but if your process only ever needs a single fixed stroke, the standard SC250X450 fixed-stroke cylinder is a simpler, more cost-effective alternative.
For this 450 mm stroke length, carefully evaluate side-loading on the 50 mm rod. High side forces or off-centre loads can cause rod bending or premature bearing wear. If the load is not perfectly guided, pair this cylinder with an external linear guide rail or switch to a guided cylinder assembly. For replacement, match the SCJ250 bore, the 450 mm nominal stroke, the 100 mm adjustment range, PT port thread, and the basic mounting configuration. The standard speed range for this ISO 6430 class bore is 30-500 mm/s.
Adjustable-stroke checklist
The push force is 24544 N at 0.5 MPa, 34361 N at 0.7 MPa, and 44178 N at the maximum operating pressure of 0.9 MPa. Pull force is slightly lower due to the single 50 mm rod: 23562 N at 0.5 MPa. The theoretical maximum force at 1.0 MPa is 5006 kgf.
Yes, if you need field-adjustable stroke control. The SCJ250X450-100 matches the SC250 bore and 450 mm nominal stroke, but adds a rear adjusting screw that shortens the stroke end by up to 100 mm. Ensure your mounting arrangement accommodates the slightly longer SCJ body length (A=409 mm) and that the PT port thread matches your existing fittings.
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