The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-10 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, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-10 is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides a 10 mm field-adjustable stroke-end range, letting you fine-tune the piston stop without remounting the cylinder. In the 250 mm bore class, this actuator delivers a substantial 24544 N of push force at 0.5 MPa and up to 44178 N at the maximum operating pressure of 0.9 MPa, driven by a 50 mm diameter piston rod.
This ISO 6430 class tie-rod cylinder uses a PT1 inch port and an M42x2 knuckle thread, with an adjustable air cushion length of 40 mm for smooth deceleration of heavy loads. The body length A(SCJ) is 409 mm, accommodating the standard 300 mm nominal stroke. Operating on 40 µm filtered air, it handles temperatures from -20 to +70 °C with its default TPU seals.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
The 10 mm adjustment screw allows operators to quickly dial in the exact bottom-dead-centre position on large forming presses during die changes, compensating for tooling wear without disassembling the actuator.
Fine-tune the push stroke on a palletizing arm to accommodate slight variations in pallet or product dimensions, ensuring consistent load placement with the cylinder's 24544 N push force at 0.5 MPa.
Use the adjustable stroke end to set the precise open/closed limits on a large quarter-turn valve actuator during commissioning, preventing over-travel and mechanical stress on the valve stem.
Choose the SCJ250 bore when your application demands a push force around 24544 N at standard plant pressure. If the load cycle requires less force, stepping down to the 200 mm bore reduces push force to 15708 N at 0.5 MPa, saving energy and physical space. For a fixed, non-adjustable stroke, the standard SC250X300 cylinder is a direct alternative. This model is a direct replacement for an existing AirTAC SCJ250X300-10 with PT ports and basic mounting. For strokes of 300 mm and above, ensure the rod is not subjected to high side loads; use an external linear guide or switch to a guided cylinder if lateral forces are present.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N. The pull force on the return stroke is 23562 N due to the 50 mm rod reducing the piston area. The maximum push force at 0.9 MPa is 44178 N.
A screw in the rear cap acts as an internal stop for the piston, allowing you to shorten the stroke end by up to 10 mm. This lets you fine-tune the cylinder's stopping position in the field without changing the 300 mm nominal stroke rating or adding external hard stops.
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