The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-30 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, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-30 is a heavy-duty double-acting single-rod pneumatic cylinder engineered for applications where the end-of-stroke position must be dialled in on the machine. With a 250 mm bore and a nominal 350 mm stroke, the rear-cap adjusting screw provides a 30 mm field-adjustable range, letting technicians fine-tune the stroke end without removing the cylinder or adding external hard stops.
At 0.5 MPa this cylinder delivers 24544 N of push force and 23562 N on the pull stroke, while the maximum push force at 0.9 MPa reaches 44178 N. The 50 mm diameter piston rod, 1-inch PT port, and 40 mm air cushion work together to handle high-inertia loads. The ISO 6430 class tie-rod body has a length A of 409 mm, making it suitable for large-scale pressing, clamping, and positioning tasks where stroke repeatability is critical.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 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. |
| ×350 | 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 bottom-dead-centre position of a large pneumatic press by adjusting the rear screw through the 30 mm range, accommodating tooling wear or different material thicknesses without disassembling the press.
Set the precise retract or extend end point for a heavy-duty material stop on a conveyor line. The adjustable stroke allows operators to quickly change the stop position for different product sizes during a format changeover.
Use the SCJ250X350-30 to power a large welding or assembly jig. Commissioning engineers can creep the stroke end into perfect alignment with the workpiece, then lock the adjusting screw for consistent, repeatable clamping force.
Step up to this 250 mm bore when the 200 mm bore's 15708 N push at 0.5 MPa is insufficient for the load. If your application does not require field-adjustable stroke, the fixed-stroke SC250X350 simplifies the bill of materials. For guided linear motion, pair this cylinder with an external guide unit or consider a guided cylinder to manage side loads on the 350 mm stroke. A direct replacement must match the 250 mm bore, 350 mm nominal stroke, 30 mm adjust range, PT port thread, basic mounting, and the absence of a magnet. For strokes of 350 mm, always assess rod deflection under compressive load; an external guide rail or a trunnion mount that allows the cylinder to self-align can prevent rod bending and seal wear.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 24544 N, and the pull force is 23562 N (the difference is due to the 50 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5006 kgf. Always apply a safety factor for real-world dynamic loads.
A rear-cap adjusting screw lets you shorten the stroke end by up to 30 mm from the nominal 350 mm maximum. It sets the physical stop position for the piston. You can replace an SC250 with this SCJ if you need field adjustability, but ensure the mounting, port thread (PT), and the lack of a magnet match your existing setup.
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