The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-30 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, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-30 is a heavy-duty double-acting single-rod cylinder that puts field-adjustable stroke control directly on the machine. Its rear-cap screw lets you shorten the stroke end by up to 30 mm without removing the cylinder, which is invaluable during commissioning of large presses or when fine-tuning the end position on a structural test rig. The 50 mm diameter piston rod and 40 mm cushion length handle the inertial loads of a 250 mm bore moving at up to 500 mm/s.
At the standard 0.5 MPa operating pressure, this cylinder delivers 24544 N of push force and 23562 N on the pull stroke, scaling to a maximum theoretical force of 5006 kgf at 1.0 MPa. The body length A(SCJ) is 409 mm, and the PT1 inch port supplies the high flow needed for this bore class. This model is built to the ISO 6430 class dimensional envelope for tie-rod cylinders, making it a direct fit for heavy industrial automation where stroke-end adjustment eliminates the need for external hard stops.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
Dial in the exact bottom-dead-centre position on a hydraulic-pneumatic forming press during die setup. The 30 mm screw adjustment allows operators to compensate for tooling wear or material thickness changes without re-mounting the cylinder.
Apply a controlled, repeatable 24544 N load to beams or assemblies. The adjustable stroke end sets the actuator's travel limit precisely, preventing over-extension of the test specimen while the single-rod design provides a clear force differential between push and pull cycles.
Use as an end-of-line pallet or steel plate stop on a conveyor. The stroke can be adjusted in the field to handle different product sizes, and the 50 mm rod withstands the impact and side-load forces better than smaller bore alternatives.
Select the SCJ250 when your application demands the highest force in the SCJ line—24544 N push at 0.5 MPa—and you need to dial in the stroke end precisely. If your force requirement is lower, stepping down to the 200 mm bore reduces push force to 15708 N at the same pressure, saving space and air consumption. For applications where the stroke is fixed and never needs field adjustment, the standard SC250 fixed-stroke cylinder is a more economical choice.
At a 300 mm nominal stroke, side-load and rod bending must be managed carefully on a single-rod cylinder of this size. Always align the load axially with the rod; if any lateral force is present, pair the cylinder with an external guide rail or switch to a guided cylinder. For replacement, match the 250 mm bore, 300 mm nominal stroke, 30 mm adjust range, PT1 inch port thread, and basic mounting configuration exactly to ensure drop-in interchangeability.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The pull force is lower because the 50 mm piston rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N.
Yes, if you need the field-adjustable stroke feature. The SCJ250X300-30 has the same 250 mm bore, PT1 inch ports, and tie-rod construction as the SC250, but the body length A(SCJ) is 409 mm to accommodate the rear adjusting screw. Ensure the 30 mm adjustment range and the slightly longer overall length fit your mounting space before swapping.
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